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Vol. 7, No. 1                 31 Jan 1997                    ISSN 1065-3597
	  (C) 1997, Regents of the University of California

Notes from the Editor
   by Brett A. Stroozas, EUVE Flight Operations Manager

   Welcome to the electronic newsletter for NASA's Extreme Ultraviolet
Explorer (EUVE) satellite, compiled and published monthly by the
Center for EUV Astrophysics (CEA) at the University of California,
Berkeley (UCB).  The contents of this issue of the EUVE electronic
newsletter are as follows:

 1. EUVE Science News
    1.1 Abstracts of Recently *Accepted* EUVE Papers
 2. EUVE Science Operations News
    2.1 EUVE Spacecraft in Safe-Hold Mode
    2.2 Public GO/RAP Data Release for 1 Jan 1997
    2.3 On-Line Access to EUVE
 3. EUVE Outsourced Extended Mission Status Report
    3.1 Mission Operations Review at GSFC
    3.2 CEA FOT Fully Staffed
    3.3 EPOC Systems Testing

To comment on or make suggestions for the EUVE electronic newsletter,
please send e-mail to (Internet).

   The EUVE observatory performed well throughout the month of Dec
1996, completing and/or beginning observations of the following Guest
Observer (GO) and Right-Angle Program (RAP) targets.  For each target
is listed its name, spectral type, observation start date and time (in
day_of_year:hours_minutes GMT format), name of Principal Investigator
(PI), observation type/priority, and any relevant notes:

  Target        SpT            Start          PI         T  Notes

Sirius B        WD:DA   332:00:40 (27 Nov)  Holberg      1  EGO,SPI
EUVE J0858-002  NOID    342:18:00 (07 Dec)  Lampton      2  EGO
HD 19373        G0V     342:18:00 (07 Dec)  Portier      3  RAP
EUVE J2206+637  NOID    343:16:00 (08 Dec)  Lampton      2  EGO
0633+1746       NeutSt  343:16:00 (08 Dec)  Edelstein    3  RAP
EUVE J0908+326  NOID    344:14:05 (09 Dec)  Lampton      2  EGO
EUVE J0249+099  NOID    344:14:05 (09 Dec)  Lampton      3  RAP
EUVE J1100+344  NOID    345:12:15 (10 Dec)  Lampton      2  EGO
EUVE J0424+15.4 NOID    345:12:15 (10 Dec)  Craig        2  RAP
EUVE J0425+15.2 NOID    345:12:15 (10 Dec)  Craig        2  RAP
NGC 4051        AGN:Sy  346:11:59 (11 Dec)  Fruscione    1  EGO
AR UMa          CV:AM   349:09:24 (14 Dec)  Silber       1  EGO,TOO
WD 0549+158     WD:DAw  351:13:20 (16 Dec)  Lallement    1  EGO,SPI
Moon            SolSys  355:01:06 (20 Dec)  Judge        1  EGO,TCO,MUL
WD 0549+158     WD:DAw  355:02:40 (20 Dec)  Lallement    1  EGO,SPI
Moon            SolSys  356:00:46 (21 Dec)  Judge        1  EGO,TCO,MUL
HD  84737       G0.5Va  356:00:46 (21 Dec)  Portier      3  RAP
WD 0549+158     WD:DAw  356:02:20 (21 Dec)  Lallement    1  EGO,SPI
Moon            SolSys  357:00:26 (22 Dec)  Judge        1  EGO,TCO,MUL
WD 0549+158     WD:DAw  357:02:00 (22 Dec)  Lallement    1  EGO,SPI
PC 0025+0447    M       357:22:31 (22 Dec)  Stringfellow 2  EGO
Moon            SolSys  358:00:06 (23 Dec)  Judge        1  EGO,TCO,MUL
1025-07         NeutSt  358:00:06 (23 Dec)  Edelstein    3  RAP
PC 0025+0447    M       358:01:40 (23 Dec)  Stringfellow 2  EGO
Safehold        -----   358:20:08 (23 Dec)  ------       -  SAF
PC 0025+0047    M       360:03:10 (25 Dec)  Stringfellow 2  EGO
Moon            SolSys  361:21:11 (26 Dec)  Judge        1  EGO,TCO,MUL
PC 0025+0047    M       361:22:46 (26 Dec)  Stringfellow 2  EGO
Moon            SolSys  362:22:25 (27 Dec)  Judge        1  EGO,TCO,MUL
alpha Col       B7IVe   362:23:50 (27 Dec)  Peters       1  EGO
Moon            SolSys  363:22:05 (28 Dec)  Judge        1  EGO,TCO,MUL
alpha Col       B7IVe   363:23:30 (28 Dec)  Peters       1  EGO
Moon            SolSys  364:21:45 (29 Dec)  Judge        1  EGO,TCO,MUL
alpha Col       B7IVe   364:23:10 (29 Dec)  Peters       1  EGO

Key to Notes:
	EGO = Guest Observer observation
	RAP = Right-Angle Program observation
	MUL = Multiple pointings
	TCO = Time-critical observation
	TOO = Target of Opportunity
	SPI = Spiral dithered observation
	SAF = Spacecraft in Safe-Hold Mode

1. EUVE Science News

1.1 Abstracts of Recently *Accepted* EUVE Papers

   Included below are abstracts of EUVE-related papers recently
*accepted* for publication.  For those papers authored by CEA
personnel, the CEA publication numbers are indicated.  Unless
otherwise noted, researchers may obtain preprints of the CEA papers by
sending an e-mail request containing the publication number(s) of
interest to

   Researchers are encouraged to contribute *accepted* EUVE-related
abstracts for inclusion in future editions of this newsletter;
abstracts will also be posted under the CEA WWW site.  Please send all
abstracts to


M.R. Burleigh, M.A. Barstow and T.A. Fleming
To appear in Monthly Notices of the Royal Astronomical Society.

   The ROSAT WFC and EUVE surveys has provided us with evidence for
the existence of a previously unidentified sample of hot white dwarfs
(WD) in non-interacting binary systems, through the detection of EUV
and soft X-ray emission. These stars are hidden at optical wavelengths
due to their close proximity to much more luminous main sequence (MS)
companions (spectral type K or earlier). However, for companions of
spectral type ~A5 or later the white dwarfs are easily visible at
far-UV wavelengths, and can be identified in spectra taken by
IUE. Eleven white dwarf binary systems have previously been found in
this way from ROSAT, EUVE and IUE observations (e.g. Barstow et
al. 1994). In this paper we report the discovery of three more such
systems through our programmes in recent episodes of IUE. The new
binaries are HD2133, RE J0357+283 (whose existence was predicted by
Jeffries, Burleigh and Robb 1996), and BD+27 1888. In addition, we
have independently identified a fourth new WD+MS binary, RE J1027+322,
which has also been reported in the literature by Genova et
al. (1995), bringing the total number of such systems discovered as a
result of the EUV surveys to fifteen.  We also discuss here six stars
which were observed as part of the programme, but where no white dwarf
companion was found. Four of these are coronally active. Finally, we
present an analysis of the WD+K0IV binary HD18131 (Vennes et
al. 1995), which includes the ROSAT PSPC X-ray data.


S. Vennes, D.J. Christian, M. Mathioudakis, and J.G. Doyle
To appear in Astronomy & Astrophysics Letters.  [CEA publication #778]

   We present far ultraviolet and optical spectroscopy of the Extreme
Ultraviolet Explorer (EUVE) survey source EUVE J0702+129 revealing a
composite K0 star plus DA white dwarf spectrum.  The International
Ultraviolet Explorer spectra show continuum emission from a hot white
dwarf (T_eff = 30-40,000 K) and a rising contribution from the K0 star
at lambda >= 2500 A. High resolution optical spectroscopy uncovers a
high level of activity with strong H-alpha and Ca H&K emission;
application of the Wilson-Bappu relation indicates that the secondary
star is slightly above the main sequence (K0 IV-V). Both objects are
found at a distance of ~130 pc and they likely constitute a physical
pair. The EUV emission is dominated by the white dwarf, but the
late-type star certainly contributes at higher energy.  An interesting
parallel is drawn with other DA+K0 pairs with moderately active
secondaries such as HD 18131 and HR 1608. The present discovery as
well as other recent ones demonstrate the existence of a large
population of white dwarfs hidden by evolved companions (III-IV).


2. EUVE Science Operations News

2.1 EUVE Spacecraft in Safe-Hold Mode
	by Brett Stroozas, EUVE Flight Operations Manager (based on a
	report by Kevin Hartnett, EUVE Mission Director at GSFC)

   The EUVE spacecraft entered Safe-Hold Mode (SHM) on Mon, 23 Dec
1996, at 20:08pm GMT (12:08pm PST).  A Goddard Space Flight Center
(GSFC) Flight Controller mistakenly initiated a command sequence to
perform a hardware dump of on-board computer (OBC) memory while the
OBC was still running.  The goal of the activity was to validate the
ability of the new Transportable Payload Operations Control Center
(TPOCC) ground system to properly initiate and process such dumps.  In
response to this improper command the on-board safe-hold processor
performed flawlessly -- halting the OBC, re-orienting the spacecraft
to the sun-line, and moving the solar arrays to maximize power.

   By 16:00 GMT (8:00am PST) on Tue morning, 24 Dec, initial recovery
activities to OBC control were underway.  With the fortunate
availability of nearly continuous TDRSS Multiple Access (MA) coverage,
and the certain knowledge that there were no hardware failures
on-board the spacecraft, the decision was made to push ahead and
recover fully to Inertial Mode, which was entered at 19:45 GMT
(11:45am PST).  Had we not done so, EUVE would have remained in
safehold for another couple days due to personnel availability over
the Christmas Holidays.

   The science payload was reconfigured from SHM during the afternoon
of Tue, 24 Dec, and was again taking GO data by 8pm PST that evening;
because of the Christmas Holidays the scanning telescopes were not
returned to nominal configuration until Fri, 27 Dec.

  The GO target PC 0025+0447 was affected by the SHM incident, as well
as one (of nine) orbits of a multiple pointing Moon observation.

2.2 Public GO/RAP Data Release for 1 Feb 1997
        by Dr. Nahide Craig, EUVE User Support Scientist

   The table below lists the GO/RAP observations that become public on
1 Feb 1997.  For each observation is given the target name, the
approximate exposure time in ksec, the GMT start/end dates, the
target's spectral type, and the data identification code (GO and RAP
data are marked accordingly).  All public data sets can be ordered
from the archive via WWW and electronic or postal mail (see addresses
below).  Please be sure to include in your order the DataID(s) of
interest.  Processed data sets are shipped via postal mail on 8mm tape
or (if requested) on CD-ROM.

   The data rights policies for observations state that Principal
Investigators (PIs) have proprietary rights to the data for a given
period of time from the date (s)he receives it.  It is often the case
that long observations are broken up over many months; e.g., an
observation approved for 60 ksec may actually be observed for 10 ksec
one month, 20 ksec the next, and 30 ksec three months later.  In such
cases the proprietary period begins after the PI is sent the final
piece of the completed observation.

   Target        ~Exp      Observation Dates      SpT      DataID
    Name        (ksec)    Start           End


		     ***** Cycle 4 Targets *****

  EUVE J1925-565   90    15 Jun - 19 Jun 1996     XRS      go0485
  EUVE J1925-565   44    25 Jun - 26 Jun 1996     XRS      go0486
  Jupiter         155    19 Jun - 24 Jun 1996     SolSys   go0487
  NGC 5548        156    26 Jun - 02 Jul 1996     AGN:Sy1  go0488
  NGC 5548        156    02 Jul - 07 Jul 1996     AGN:Sy1  go0489
  Ton S180        130    08 Jul - 12 Jul 1996     AGN:Sy1  go0490
  Ton S180        130    12 Jul - 17 Jul 1996     AGN:Sy1  go0491

		     ***** Cycle 3 Targets *****

  Capella          51    30 Nov - 02 Dec 1995    G5IIIe    go0492
  Capella          51    02 Dec - 04 Dec 1995    G5IIIe    go0493
  RE J1016-052     61    04 Dec - 06 Dec 1995    WD:DA     go0494
  EK Dra           94    10 Dec - 13 Dec 1995    F8        go0495
  Moon              2    13 Dec - 13 Dec 1995    SolSys    go0496
  MRK 142           9    13 Dec - 13 Dec 1995    AGN:Sy1   go0497
  EUVE J0503+231    1    13 Dec - 13 Dec 1995    NOID      go0498
  beta CMa         64    26 Nov - 28 Nov 1995    B1II/III  go0499
  beta CMa         44    13 Dec - 15 Dec 1995    B1II/III  go0500
  beta CMa         55    29 Dec - 31 Dec 1995    B1II/III  go0501
  NGC 1851         37    15 Dec - 16 Dec 1995    GlobClus  go0502
  EUVE J0720-317  100    16 Dec - 20 Dec 1995    WD:DA     go0503
  EUVE J0720-317    5    20 Dec - 20 Dec 1995    WD:DA     go0504
  zeta Pup        100    20 Dec - 24 Dec 1995    O5Ia      go0505
  zeta Pup         41    24 Dec - 25 Dec 1995    O5Ia      go0506
  Coma Cluster     84    25 Dec - 28 Dec 1995    ClusGal   go0507
  EUVE J1034+073   20    28 Dec - 29 Dec 1995    NOID      go0508
  GJ 354.1        100    31 Dec - 03 Jan 1996    K0        go5009
  GJ 354.1        100    03 Jan - 07 Jan 1996    K0        go0510
  GJ 354.1        100    07 Jan - 10 Jan 1996    K0        go0511
  GJ 354.1         14    10 Jan - 11 Jan 1996    K0        go0512
  Moon              2    11 Jan - 11 Jan 1996    SolSys    go0513
  NGC 5457         56    11 Jan - 13 Jan 1996    Gal       go0514
  RE J0751+144    100    13 Jan - 16 Jan 1996    CV:DQ     go0515
  RE J0751+144     85    16 Jan - 19 Jan 1996    CV:DQ     go0516
  ALEXIS Transient 31    19 Jan - 21 Jan 1996    NOID      go0517
  IRAS 13349+2438  12    21 Jan - 21 Jan 1996    AGN:QSO   go0518


  ALEXIS Transient 62    03 Jun - 05 Jun 1996    NOID      rap0071
  EUVE J1854-324  110    07 Jun - 11 Jun 1996    NOID      rap0072
  EUVE J1706-450   36    11 Jun - 12 Jun 1996    NOID      rap0073
  WGA J1559+27     86    12 Jun - 15 Jun 1996    NOID      rap0074
  1908+0734       260    08 Jul - 17 Jul 1996    Pulsar    rap0075


2.3 On-Line Access to EUVE

   Listed below are the various methods for on-line access to EUVE:

 o CEA World Wide Web (WWW)

   telnet 200 (for those without a WWW browser)

 o anonymous FTP

	Name:  anonymous
	Password:  type_your_full_e-mail_address

 o anonymous gopher


 o EUVE Electronic Newsletters

     Past issues -- available via the CEA WWW site
     Subscriptions -- mail ("subscribe
     Post message (moderated) to all subscribers:

 o GI Program

     Are you interested in finding out about or using EUVE data?  Do
     you need help in understanding EUVE data sets?  Do you need help
     in using the available EUVE data analysis software tools?  If you
     answer "yes" to any of the above, the Guest Investigator (GI)
     Program at CEA can help YOU!  For more information see the CEA
     WWW site or contact the Archive (

 o Public RAP

     The Public Right Angle Program (RAP) is a simple and easy method
     for researchers to propose for long-exposure EUVE imaging data.
     For more information on the Public RAP and the simple proposal
     process see the CEA WWW site or contact the EGO Center
     (  Mail all proposals to

 o Contact information for the EUVE Science Archive or EGO Center:

		     Center for EUV Astrophysics
			  2150 Kittredge St.
		       Berkeley, CA  94720-5030
			 510-642-3032 (voice)
			  510-643-5660 (fax)

3. EUVE Outsourced Extended Mission Status Report
	by Brett Stroozas, EUVE Flight Operations Manager

   Work continues to outsource EUVE Explorer Platform (EP) spacecraft
operations from GSFC to the EUVE Platform Operations Center (EPOC) at
CEA.  Upon completion of the operations handover, which is scheduled
for Feb 1997, the EUVE Outsourced Extended Mission (OEM) will
commence.  The following sections describe some of the outsourcing
highlights from Dec 1996.

3.1 Mission Operations Review at GSFC

   On 6 Dec 1996 an EUVE OEM Mission Operations Review (MOR) was held
at GSFC.  Brett Stroozas and George Kaplan of CEA traveled to GSFC and
presented material on the outsourcing: overall planning; CEA Flight
Operations Team (FOT) staffing and training; EPOC design,
implementation, and testing; etc.  Outstanding issues and concerns
were highlighted and performance criteria were outlined for the
operations handover.  The review was attended by a five-person GSFC
Review Panel and ~30 additional GSFC personnel that are affiliated
with the EUVE Project.  The review was very successful and GSFC
personnel were quite satisfied with CEA's plans and overall progress
to date.  The Review Panel wrote up and distributed to CEA some Review
Item Discrepancies (RIDs), which outline a number of mostly minor
issues that remain to be addressed before the completion of the
handover of operations from GSFC to CEA.  CEA has taken these RIDs as
action items and has begun working to address them.  In all, the final
operations handover from GSFC to CEA is still on schedule for mid- to
late-Feb 1997.

3.2 CEA FOT Fully Staffed

   By mid-Dec 1996 the final hiring activities were completed for
CEA's FOT.  The fully staffed eight-person CEA FOT is composed of the

 | FOT Member's                       FOT Member's		       |
 |    Name                           Responsibility		       |
 | Rob Nevitt		EUVE Platform Operations Manager/Lead Systems  |
 |      			Engineer			       |
 | Chris Smith		EUVE Attitude Control Subsystem (ACS) Engineer |
 | Greg Picard		EUVE Communications & Data Handling (C&DH)     |
 |      			Subsystem Engineer		       |
 | Mark Lewis		EUVE Power and Thermal (P&T) Subsystem	       |
 |      			Engineer			       |
 | Sriram Chelluri	EUVE Ground Systems Engineer		       |
 | Marty Eckert		EUVE Spacecraft Controller/Scheduler	       |
 | John McDonald	EUVE Spacecraft Controller/Scheduler	       |
 | Jeremy Thorsness	EUVE Spacecraft Controller/Scheduler	       |

By the end of Dec six of the eight FOT members had completed an
extensive one- or two-month training period at GSFC with the incumbent
Lockheed-Martin FOT; the other two FOT members (John and Jeremy) are
currently training at GSFC and will return to CEA in early Feb 1997.

3.3 EPOC Systems Testing

  The month of Dec 1996 was an extremely busy one for testing and
validating the EPOC ground systems.  A number of formal and informal
tests were conducted to validate the various communications links,
ground system components, and training of CEA FOT personnel.  The
following subsections describe some of the highlights of these testing

3.3.1 TDRSS Scheduling Tests

   The EUVE spacecraft communicates to the ground via NASA's Tracking
and Data Relay Satellite System (TDRSS), which is managed by GSFC's
Network Control Center (NCC).  The FOT schedules real-time contacts
with the spacecraft by interfacing with the NCC for TDRS time.

  On 5 Dec 1996 a successful engineering interface (EIF) test was
conducted with the NCC for the purpose of validating the relevant
communications lines and the receipt and transmission of the proper
ground control message requests (a.k.a. GCMRs) and acknowledgments.
This test confirmed the schedule-related operations of CEA's TPOCC

  An additional EIF test was conducted with the NCC on 30 Dec.  The
purpose of this test was to validate proper communication of TDRSS
scheduling information between NCC and CEA.  This test was also very
successful.  In addition to validating the CEA/NCC communications
interfaces, this test served to validate the following EPOC ground
system components: EP Planning System (EPPS), User Planning System
(UPS), and Flight Dynamics Facility Orbital and Mission Aids
Transformation System (FORMATS).

   As a result of the above tests CEA was able to demonstrate its
readiness to begin the scheduling shadow operations period in early
Jan 1997; details on this will appear in the next newsletter.

3.3.2 Command and Telemetry Tests

   Command and telemetry tests were conducted throughout the month of
Dec 1996.  Although the majority of the testing was done using the
GSFC EP simulator, the EPOC FOT also conducted live commanding of the
spacecraft in orbit.

   On 3 Dec 1996 an initial command test was conducted between the
EPOC and the EP in orbit.  This test was a complete success!  The
EPOC, via the TPOCC command and control system, sent the following
commands to the EP: a single noop (no-operation), a string of five
buffered noops, and three tape recorder dump speed commands.  All
commands executed properly, returning the appropriate telemetry
readings and incrementation of the command counter.  This initial
end-to-end command and telemetry test provided validation that all of
the relevant systems were properly configured.  Similar command and
telemetry tests were conducted during the subsequent two weeks.

3.3.3 Three-Day EPOC/FOT "Stress" Test

   A three-day EPOC "stress" test was held 17-19 Dec 1996.  The
purpose of this test was to stress both the EPOC ground systems and
FOT personnel by having CEA fly the spacecraft during this time.  The
results of the stress test were as follows:

 o Day 1 (17 Dec) -- This day was only marginally successful.  Because
   of problems with the command communications channel CEA was only
   able to complete about half of the normal daily duties (i.e., tape
   recorder management and command/table loads/dumps).

 o Day 2 (18 Dec) -- This day was much more successful.  Once the
   command channel problems of the previous day were resolved CEA was
   able to complete most of the normal daily activities along with a
   few extras (e.g., OBC memory dumps).  Unfortunately, CEA
   experienced a variety of problems with its TPOCC system that
   hampered overall productivity.

 o Day 3 (19 Dec) -- This day was a complete success.  Once the TPOCC
   problems of the previous day were resolved CEA was able to complete
   all of the regular daily activities, plus a few extras (e.g.,
   payload commanding, OBC memory dumps, and an engineering format

Overall, the stress test was an excellent experience.  The EPOC ground
systems were sufficiently stressed to identify areas that need
additional work.  The CEA FOT personnel obtained valuable experience
in routine activities as well as in anomaly trouble-shooting and


  The EUVE Electronic Newsletter is issued by the Center for Extreme
  Ultraviolet Astrophysics, University of California, Berkeley, CA
  94720, USA.  The opinions expressed are those of the authors.  EUVE
  Principal Investigators and Newsletter Publishers: Dr. Roger F.
  Malina and Professor Stuart Bowyer.  EUVE Flight Operations Manager
  and Newsletter Editor: Brett A. Stroozas.  Funded by NASA/UCB
  Cooperative Agreement NCC5-138.  Send newsletter correspondence to

  The EUVE project is managed by NASA's GSFC: Paul Pashby, GSFC
  Project Manager; Dr. Yoji Kondo, Project Scientist; Dr. Ronald
  Oliversen, Deputy Project Scientist; Mr. Kevin Hartnett, Mission
  Director.  NASA HQ: Dr. Guenter Riegler, Program Manager.
  Information on the EUVE GO Program is available from Dr. Ron
  Oliversen, Mail Code 681, GSFC, Greenbelt, MD 20771 at (301)
  286-6290 or e-mail to


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