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Vol. 7, No. 5                 31 May 1997                    ISSN 1065-3597
	  (C) 1997, Regents of the University of California

Notes from the Editor
   by Brett A. Stroozas, EUVE Mission/Flight Director

   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 List of Approved Cycle 5 Proposals
    1.2 EUVE Data Delivery Resumes
    1.3 Public GO/RAP Data Release for 1 Jun 1997
    1.4 Abstracts of Recently *Accepted* EUVE Papers
 2. EUVE Satellite Operations News
    2.1 Operations Status Report
    2.2 Subsystem Trending Begins Again
    2.3 UCB Receives Additional Services from NCC
    2.4 On-Line Access to EUVE
 3. EUVE Outsourced Extended Mission Status Report
    3.1 Final Major GFE Shipment Completed
    3.2 DSN Test Conducted Successfully

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 Apr
1997, 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 (generally from the SIMBAD
database), observation start date and time (format is GMT
day_of_year:hours:minutes), name of Principal Investigator (PI),
observation type/priority, and any relevant notes:

  Target        SpT            Start          PI         T  Notes
alpha Car       F0II    089:04:10 (30 Mar)  Brown        2  EGO
HD 74389 B      WD:DA   098:05:50 (08 Apr)  Barstow      2  EGO,SPI
RE 1034+393     AGN:Sy1 104:05:25 (14 Apr)  Fruscione    1  EGO,CO1
ksi Boo A       G8V     110:02:00 (20 Apr)  Drake        1  EGO
EUVE_J1118-569  NOID    110:02:00 (20 Apr)  Lampton      1  RAP
NGC 4151        AGN:Sy1 120:23:40 (30 Apr)  Zdziarski    1  EGO,CO2
Key to Notes:
        CO1 = Coordinated observation with SAX satellite
        CO2 = Coordinated observation with XTE satellite
        EGO = EUVE Guest Observer observation
        RAP = Right-Angle Program observation
        SPI = Spiral-dithered observation

1. EUVE Science News

1.1 List of Approved Cycle 5 Proposals
	by Dr. Jean Dupuis, EUVE GO Scientist

   The following is the list of approved EUVE Cycle 5 GO proposals.
For each entry is included the proposal identification number, the
target name, the approved exposure time (ksec), they proposal
type/priority (types 1 or 2, or Data Rights only), and the name of the
principal investigator.  This list is also available on the EUVE WWW
site at the following URL (note that this address is one URL and has
been broken into two pieces only for readability sake):

	Proposal_ID	Target_Name	Exp	Typ	PI
	96-EUVE001	RXJ1856-3754	500	1	Walter
	96-EUVE002	Abell 2199	 50	2	Lieu
	96-EUVE002	Abell 4038	 70	2	Lieu
	96-EUVE005	NGC 1360	340	2	Rauch
	96-EUVE006	U Gem		160	1	Mauche
	96-EUVE007	OY Car		100	1	Mauche
	96-EUVE010	RE 0632-050	110	1	Wolff
	96-EUVE011	GD 358		 50	1	Provencal
	96-EUVE015	Comet P/Encke	100	1	Lisse
	96-EUVE019	Venus		 20	1	Stern
	96-EUVE021	RXJ 0719	 50	1	Howell
	96-EUVE021	RXJ 0757	 50	2	Howell
	96-EUVE022	0152-16		 20	2	Bowyer
	96-EUVE022	1239+24		 20	2	Bowyer
	96-EUVE022	1932+11		 20	2	Bowyer
	96-EUVE022	B0950+08	 20	2	Bowyer
	96-EUVE022	J2124-33	 20	2	Bowyer
	96-EUVE022	J2144-39	 20	2	Bowyer
	96-EUVE023	AM Her		 34	2	Christian
	96-EUVE023	VV Pup		 90	2	Christian
	96-EUVE025	GD 80		265	1	Barstow
	96-EUVE027	QS Tel		 90	1	Rosen
	96-EUVE029	beta Crt	---	DR	Burleigh
	96-EUVE031	RXJ1802+180	100	1	Szkody
	96-EUVE033	Jupiter		 50	2	Hall
	96-EUVE033	Jupiter		 50	2	Hall
	96-EUVE033	Jupiter		100	2	Hall
	96-EUVE036	EUVEJ0916-197	 50	1	Dupuis
	96-EUVE036	EUVEJ1659+440	325	1	Dupuis
	96-EUVE037	MU Vel		250	1	Ayres
	96-EUVE037	beta Cas	300	1	Ayres
	96-EUVE040	EUVEJ2115-586	 53	2	Christian
	96-EUVE041	beta Crt	120	1	Vennes
	96-EUVE041	theta Hya	200	1	Vennes
	96-EUVE044	AR Psc		400	1	Dupree
	96-EUVE044	lambda And	300	1	Dupree
	96-EUVE044	sigma Gem	---	DR	Dupree
	96-EUVE045	NISM/Survey	 54	1	Flynn
	96-EUVE045	NISM/Downwind	 24	1	Flynn
	96-EUVE045	NISM/Profile	 24	1	Flynn
	96-EUVE046	GD 153		125	1	Holberg
	96-EUVE047	Comet Hale-Bopp	100	1	Mumma
	96-EUVE048	Her X-1		100	1	Leahy
	96-EUVE050	lamda Sco	200	2	Berghoefer
	96-EUVE051	MBM12		180	2	Berghoefer
	96-EUVE054	J034543+2540	200	2	Stringfellow
	96-EUVE055	NGC 4151	175	1	Zdziarski
	96-EUVE056	ksi Boo A	350	1	Drake
	96-EUVE057	FK Aqr		350	1	Drake
	96-EUVE059	alpha Car	200	1	Brown
	96-EUVE061	EI Eri		200	1	Brown
	96-EUVE061	BY Dra		200	2	Brown
	96-EUVE061	V478 Lyr	200	2	Brown
	96-EUVE061	sigma CrB	100	2	Brown
	96-EUVE061	sigma Gem	210	2	Brown
	96-EUVE061	AR Psc		---	DR	Brown
	96-EUVE061	lambda And	---	DR	Brown
	96-EUVE062	EUVEJ1034+39.6	100	1	Fruscione
	96-EUVE064	EUVEJ0622-17.9	250	1	Peters
	96-EUVE065	1H0419-577	700	1	Marshall
	96-EUVE067	EUVEJ2249+585	 95	1	Chayer
	96-EUVE067	EUVEJ1043+490	120	2	Chayer
	96-EUVE070	Saturn		240	1	Gladstone
1.2 EUVE Data Delivery Resumes
	by Dr. Michael Gunter, EUVE Project Manager

   As many of you know, the EUVE project has been updating the science
processing pipeline for use in building the permanent data archive.
This "update", however, has not been without cost.  We have
experienced delays in processing new GO observations and in delivery
of archival data.

   I am pleased to announce that processing is now once again
underway.  All new GO observations will be processed and mailed within
the next two weeks; some GOs have already received their data
products.  Archive researchers should begin receiving their data by
late June.  We appreciate your patience during the last several weeks.

   In the months ahead, we will be introducing some positive changes
for researchers.  A new data format -- the same one used for the
permanent archive -- will be introduced.  This will enable the
scientist to have a common data format that can be used now and in the
future.  We will also be experimenting with FTP delivery of data
products: for those who need the fastest possible access to off-line
EUVE data.

   The Guest Scientist program, introduced last month, is gaining
community interest.  These accounts provide access to EUVE's data and
computer facilities, and includes one gigabyte of disk space.  Active
EUVE researchers are encouraged to contact
and request an account.

   Again, I want to thank all of you for your patience over the past
few weeks.  Let us know what you think about the new data products.
We hope you will be pleasantly surprised.

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

   The table below lists the GO/RAP observations that become public on
1 Jun 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.  See the UCB-CEA WWW site (address
below) for a complete list of publicly available EUVE data products.

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


                        Cycle 4 Targets

  EQ Peg           86     02 Oct - 05 Oct 1996    M4V      go0562
  gamma Tau       124     05 Oct - 09 Oct 1996    K0IIIab  go0563

                        Cycle 3 Targets

  17 Lep           99     04 Feb - 07 Feb 1995    Ap       go0564
  AD Leo           95     03 May - 06 May 1996    M4.5Ve   go0565


  EUVE J0113+624   96     21 Dec - 24 Dec 1994    NOID     rap0086
  EUVE J0715+141  141     30 Jan - 04 Feb 1995    NOID     rap0087
  EUVE J2110-193  296     31 Aug - 13 Sep 1995    NOID     rap0088
  V471 Tauri        6     06 Nov - 06 Nov 1995    DA+K2    rap0089


1.4 Abstracts of Recently *Accepted* EUVE Papers

   Included below are abstracts of EUVE-related papers recently
*accepted* for publication.  For those papers authored by UCB-CEA
personnel, the UCB-CEA publication numbers are indicated.  Unless
otherwise noted, researchers may obtain preprints of the UCB-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 and for
posting under the UCB-CEA/EUVE WWW site.  Please send all abstracts to


N. Craig, M. Abbott, D. Finley, H. Jessop, S.B. Howell,
  M. Mathioudakis, J. Sommers, J.V. Vallerga, and R.F. Malina
To appear in Astrophysical Journal Supplement.

   We present an atlas of extreme ultraviolet (EUV) spectra of 95
bright stellar sources observed between 1992 July and 1996 June with
the Extreme Ultraviolet Explorer (EUVE) spectrometers.  These data are
taken in the short (SW; 70-190 A), medium (MW; 140-380 A), and long
wavelength bandpasses (LW; 280-760 A) at roughly 0.5, 1, and 2 A
resolution, respectively.  We describe the spectrometers and detail
the procedure used to reduce the observational data to spectra.  The
atlas is grouped by the type of source: O-A stars, F-M stars, white
dwarfs, and cataclysmic variables.  We present a brief overview of the
general nature and EUV spectral distribution of each group and present
accompanying notes and individual spectra for each source.  We show
selected F-M sources in more detail with identifications of the
brightest spectral lines illustrating the characteristics of the EUV
spectra of stars of various temperatures.  The current study is the
most complete compilation to date of aggregate spectra of bright EUV
stellar sources.


2. EUVE Satellite Operations News
	by Brett A. Stroozas, EUVE Mission/Flight Director

2.1 Operations Status Report

   During Apr the UCB Flight Operations Team (FOT) completed its first
full official calendar month of operational control over the EUVE
spacecraft; both payload and spacecraft systems continued to perform
very well during this time period.  Other than an adjustment to
on-board battery management and to some glitches with a star tracker
during the RE 1034+393 observation, all daily operations have
proceeded quite routinely (knock on wood!).

   The EUVE satellite is being operated in a single-shift operations
mode, with personnel on-site at UCB only during the day shift (8am-5pm
local Pacific time), seven days per week.  During this day shift the
FOT performs the daily routine realtime and offline payload and
spacecraft activities.  The realtime activities -- i.e., those
conducted during realtime contacts with the satellite -- consist
mainly of monitoring of flight system telemetry for performance and
safety, instrument commanding, and data play-back from the on-board
tape recorders; the offline activities include subsystem trending
analysis, mission planning and scheduling, and various flight and
ground system maintenance activities.

2.2 Subsystem Trending Begins Again

   Engineering trending of the EUVE spacecraft subsystems began again
in earnest with the arrival at UCB of an operational trending system
from GSFC.  Engineers at GSFC had been using the Engineering Analysis
System (EAS) for all spacecraft trending; a second system, the Generic
Trend Analysis System (GTAS), was under development.  A version of
GTAS was sent to UCB in late Jan and, over the course of the next few
months, was set up to provide UCB with some minimal spacecraft
trending capabilities.  At the end of Mar, after the official handover
of operational control from GSFC to UCB on the 14th, the EAS was
shipped to UCB and was soon thereafter up and running operationally,
providing UCB with full spacecraft trending capabilities.  With the
addition of EAS and GTAS to the UCB ground systems, the subsystem
engineers are now back into the habit of routinely performing trend
analyses on the various flight system components.

2.3 UCB Receives Additional Services from NCC

   The Network Control Center (NCC) is the facility at GSFC that
manages and schedules the resources of NASA's Tracking and Data Relay
Satellite System (TDRSS), through which EUVE communicates to the
ground.  The NCC currently provides the EUVE Project with a variety of
services for scheduling and conducting realtime contacts with --
"acquisitions of" -- the spacecraft, during which the FOT carries out
the various realtime activities.

   In early Apr, at the request of UCB, the NCC agreed to perform some
additional services during UCB's off-shift hours (5pm-8am local
Pacific time).  The first was that, in case of a negative acquisition
("neg acq") -- i.e., when realtime contact is not successfully
initiated with the spacecraft -- the NCC will, on their own, initiate
reacquisition sequences ("reacqs") to acquire communications with the
spacecraft.  This will ensure that the EUVE automated telemetry
monitoring system at UCB (which is not currently capable of initiating
reacqs on its own) continues to receive and monitor satellite
telemetry on a regular basis.  In the event that the NCC's reacqs
fail, they will then page on-call UCB FOT personnel who will
investigate the situation further.

   This is just another in the long list of great services that the
NCC has provided since launch to the EUVE Project.  This new NCC
service will not only reduce the overall risk to the Project during
the off-shift hours, but will also minimize the need for UCB to
develop additional software.  Our sincere thanks to the NCC for all of
their continued help and support!

2.4 On-Line Access to EUVE

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

 o UCB-CEA World Wide Web (WWW) at URL:

 o anonymous FTP:

 o EUVE Electronic Newsletters

     Past issues -- available via the UCB-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 UCB-CEA can help YOU!  For more information see the UCB-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 UCB-CEA WWW site (address below) 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 Mission/Flight Director

   Work continues to outsource EUVE Explorer Platform (EP) spacecraft
operations from GSFC to the EUVE Platform Operations Center (EPOC) at
UCB-CEA.  The following sections describe some of the outsourcing
highlights from Mar 1997.

3.1 Final Major GFE Shipment Completed

   The final major shipment of government-furnished equipment (GFE)
was completed in mid-Apr.  This shipment included a number of
computers, monitors, and printers for various ground systems
components: the backup strings of the Command Management System (CMS)
and the Transportable Payload Operations Control Center (TPOCC)
command and control system, and the EAS trending system.  With remote
support from GSFC, UCB systems and operations personnel quickly went
to work on installing, configuring, and testing the various systems,
most of which are now being used operationally.

3.2 DSN Test Conducted Successfully

   A successful command and data flow test was conducted during Apr
via NASA's Deep Space Network (DSN).  The DSN, which is responsible
for providing communications with NASA's solar system and deep-space
probes (e.g., Voyager), also provides emergency communications
capabilities for low-Earth orbiting satellites like EUVE.  This test
consisted of sending commands to, and receiving simulated telemetry
from, the DSN station in Canberra, Australia.  This successful test
ensures that DSN communications capabilities exist should they be
needed to support an EUVE satellite emergency.  Additional follow-up
tests will soon be scheduled.


  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 Newsletter Editor: Brett
  Stroozas.  Funded by NASA/UCB Cooperative Agreement NCC5-138.  Send
  newsletter correspondence to

  The EUVE project is managed for NASA by UCB: Dr. Roger F. Malina,
  EUVE Observatory Director; Dr. John Vallerga, EUVE Observatory
  Deputy Director; Dr. Mike Gunter, EUVE Project Manager; Mr. Brett
  Stroozas, EUVE Mission/Flight Director; Mr. Rob Nevitt, EUVE
  Operations Manager.  NASA HQ: Dr. Guenter Riegler, Program Manager.


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