EEEEEEEEEEE U U V V EEEEEEEEEEE
E U U V V E
E U U V V E
EEEEEEE U U V V EEEEEEE
E U U V V E
E U U V V E
EEEEEEEEEEE UUUUU V EEEEEEEEEEE
---------------------------------------------------------------------------
ELECTRONIC NEWSLETTER OF THE EUVE OBSERVATORY
---------------------------------------------------------------------------
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 ceanews@cea.berkeley.edu (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):
http://www.cea.berkeley.edu/~science/html/
sci_dataacq_go_proposers_nra5_approvedtargets.html
-------------------------------------------------------------
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 egoinfo@cea.berkeley.edu
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
===============================================================
GO DATA SETS AVAILABLE 1 JUN 1997:
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
RAP DATA SETS AVAILABLE 1 JUN 1997
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 pub@cea.berkeley.edu.
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
archive@cea.berkeley.edu.
--------------------------------------------------------------
THE EXTREME ULTRAVIOLET EXPLORER SPECTRAL ATLAS
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: http://www.cea.berkeley.edu/
o anonymous FTP: ftp.cea.berkeley.edu
o EUVE Electronic Newsletters
Past issues -- available via the UCB-CEA WWW site
Subscriptions -- mail majordomo@cea.berkeley.edu ("subscribe
euvenews")
Post message (moderated) to all subscribers:
mail euvenews@cea.berkeley.edu
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 (archive@cea.berkeley.edu).
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 (egoinfo@cea.berkeley.edu). Mail all proposals to
euverap@cea.berkeley.edu.
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)
archive@cea.berkeley.edu
egoinfo@cea.berkeley.edu
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 ceanews@cea.berkeley.edu.
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.
END-----------EUVE------------ELECTRONIC---------------NEWS-------------END
[HomePage]
[Email]
[Search]
[Glossary]
Page created by webmastr@cea.berkeley.edu
Last modified 10/4/97