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ELECTRONIC NEWSLETTER OF THE EUVE OBSERVATORY
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Vol. 7, No. 2 22 Feb 1997 ISSN 1065-3597
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(C) 1997, Regents of the University of California
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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 EUVE GO Cycle 5 Proposals Due 28 Feb
1.2 Call for Reviewers -- EUVE Cycle 5
1.3 EUVE Stellar Spectral Atlas
1.4 Abstracts of Recently *Accepted* EUVE Papers
2. EUVE Satellite Operations News
2.1 EUVE Spacecraft in Safe-Hold Mode
2.2 Public GO/RAP Data Release for 1 Mar 1997
2.3 On-Line Access to EUVE
3. EUVE Outsourced Extended Mission Status Report
3.1 Government-Furnished Equipment
3.2 EPOC Ground Systems Testing
3.3 Shadow Operations Period Begins
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 Jan
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, 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
=======================================================================
alpha Col B7IVe 364:23:10 (29 Dec) Peters 1 EGO
GL 205 M1.5V 003:15:10 (03 Jan) Giampapa 1 EGO,ADJ
WGA J1046+63 AGN 003:15:10 (03 Jan) Fruscione 3 RAP
Safe-Hold ---- 011:21:49 (11 Jan) ------ - SHM
GL 205 M1.5V 013:21:09 (13 Jan) Giampapa 1 EGO
47 Cas F0Vn 023:02:25 (23 Jan) Guinan 1 EGO,CO1
EUVE J0642-046 NOID 023:02:25 (23 Jan) Lampton 3 RAP
47 Cas F0Vn 026:01:25 (26 Jan) Guinan 1 EGO,CO1
LHS 36 M6V:e 026:01:25 (26 Jan) Mathioudakis 3 RAP
ALEXIS Trans NOID 028:02:20 (28 Jan) Bloch 1 EGO,TOO
V471 Tau K0 030:00:00 (30 Jan) Siegmund 1 EGO,CO2,TCO
=======================================================================
Key to Notes:
ADJ = Target adjustment of ~3 degrees (spacecraft roll) made
at 003:23:05 (03 Jan) due to star tracker problems
CO1 = Coordinated observation with SAX satellite
CO2 = Coordinated observation with HST satellite
EGO = EUVE Guest Observer observation
RAP = Right-Angle Program observation
SHM = EUVE spacecraft in Safe-Hold Mode
TCO = Time-critical observation
TOO = Target of Opportunity
1. EUVE Science News
====================
1.1 EUVE GO Cycle 5 Proposals Due 28 Feb
----------------------------------------
This is a reminder to the observing community that proposals for
Cycle 5 of the EUVE Guest Observer (GO) Program are due on 28 Feb
1997. A NASA Research Announcement (NRA) for Cycle 5 was released on
30 Dec 1996; about $400K is expected to be available to fund Cycle 5
programs. The NRA proposal process will be conducted by NASA and the
peer review will take place within one month of the proposal deadline.
The NRA is accessible directly from NASA's Office of Space Science
World Wide Web (WWW) HomePage at the URL
http://www.hq.nasa.gov/office/oss/
in the "Research Opportunities" menu (NRA 96-OSS-15). Relevant
proposal material is also publicly available on the CEA ftp site at
ftp.cea.berkeley.edu
in the directory /pub/nra96.
1.2 Call for Reviewers -- EUVE Cycle 5
--------------------------------------
by Dr. Ron Oliversen, EUVE Associate Project Scientist @GSFC
The EUVE project is soliciting reviewers for the 5th Cycle of the
EUVE Guest Observer program. The EUVE proposals are due on 28 Feb
with the peer review to be held on 25-26 Mar. The proposals will be
delivered via FedEX to reviewers during the first week in Mar.
Here is your opportunity for a trip to the Washington, D.C. area,
to serve your fellow astronomers, and to get a lighter proposal load
than most other NASA reviews. EUVE review panels typically have fewer
than 25 proposals, each having four pages of scientific justification.
Except for the panel chairs, most panels should complete their reviews
within one day.
Proposals are submitted in one of the categories listed below, but
some review panels may be a combination of topics. If you wish to
volunteer, please check the research areas (AS MANY AS APPLY -- SEE
BELOW) in which you are willing to serve and send to
euve@stars.gsfc.nasa.gov.
************** DO NOT REPLY to this email. *****************
The EUVE project will ensure there are no conflicts of interest and those
selected to serve on the EUVE review panels will be notified by 5 Mar.
If you have any questions, please contact the EUVE Associate Project
Scientist, Ron Oliversen, at oliversen@stars.gsfc.nasa.gov.
o Solar System Objects (planets, comets, Moon)
o Interstellar Medium and Galactic Structure (supernova remnants,
dark clouds, interstellar dust, H II regions, diffuse galactic
emission, planetary nebulae gas)
o Post Main Sequence Stars and Collapsed Objects (isolated white
dwarfs, isolated neutron stars, central stars of planetary nebulae)
o Binary Systems (cataclysmic variables and AM Her objects)
o Other Binary Systems (RS CVn's, symbiotic stars, etc.)
o Early and Late type Single Stars (hot and cool stars)
o Extragalactic Objects (AGN, normal galaxies, etc.)
1.3 EUVE Stellar Spectral Atlas
-------------------------------
by Dr. Nahide Craig, EUVE Archive Scientist
The "EUVE Stellar Spectral Atlas", a paper recently submitted to
The Astrophysical Journal Supplement, contains EUV spectra of 95
stars, and line identifications of bright late-type stars. The paper,
in PostScript form, is now available in the CEA WWW site, either via
the "Publications" section at URL
http://www.cea.berkeley.edu/~science/html/sci_archive_pubs_pubs.html
or directly at URL
http://www.cea.berkeley.edu/~science/html/sci_archive_pubs_atlas.html
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 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 pub@cea.berkeley.edu.
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 archive@cea.berkeley.edu.
--------------------------------------------------------------
CIRCUMSTELLAR DISK VARIATIONS AROUND BETA PICTORIS
B.Y. Welsh, N. Craig, S. Jelinsky, and T. Sasseen
To appear in Astronomy & Astrophysics. [CEA publication #774]
We present high resolution spectral observations of the absorption
lines of Ca II and Na I associated with the circumstellar disk
surrounding the star Beta Pictoris. The observations were taken over
a four night period in January 1996 and reveal substantial profile
variability between successive nights. High velocity absorption
features at velocities of +58 km/s were observed in the Ca II data,
but were not present in the Na I profiles. An unusually high Ca II :
Na I ratio of approximately 150:1 was found for the central, stable V
= +22 km/s component.
--------------------------------------------------------------
2. EUVE Science Operations News
===============================
2.1 EUVE Spacecraft in Safe-Hold Mode
-------------------------------------
by Brett Stroozas, EUVE Flight Operations Manager
At 07:12 Zulu (2:12am EST) on Saturday, 11 Jan, during the
off-shift hours, the on-board high-gain antennae pointing software
(HGAPS) detected an anomaly and disabled itself. This resulted in a
loss of track between the EUVE HGA and NASA's Tracking and Data Relay
Satellite (TDRS), severing the realtime communication link between
EUVE and the ground.
When the GSFC FOT arrived at work later that morning they noticed
the loss of communications with the spacecraft and began analyzing the
problem. At 20:31Z (3:31pm EST) the FOT reestablished reliable
communications with the spacecraft by switching to the low-gain
omni-directional (omni) antenna. During the intervening hours the
gimbals that steer the HGA had been exposed to direct sunlight, which
heating them to extremely high levels (~70 deg C). In an effort to
shade the gimbals the GSFC FOT commanded the spacecraft to Fine Sun
Acquisition Mode, which moves the spacecraft to the sun-line and parks
the HGA such that it shades the gimbals. Unfortunately, the move from
the science attitude to the sun-line caused the gyros to saturate; the
on-board computer (OBC) interpreted this as gyro failure and commanded
the spacecraft into Safe-Hold Mode (SHM) at 21:49Z (4:49pm EST). The
move to SHM accomplished the intent of moving to the sun-line and
shading the gimbals, albeit in a less desirable fashion.
After determining that the spacecraft was, indeed, safe and
power-positive it was decided to leave it in SHM in order to let the
gimbals cool before reconfiguration activities began in earnest the
following morning.
The spacecraft and payload recovery activities proceeded smoothly.
On Sunday, 12 Jan, the gyros were reconfigured to their normal state
and the spacecraft was returned to inertial mode. The payload heaters
were turned on in the afternoon, beginning the payload recovery
efforts. The science target (GL 205) was reacquired later that
evening at 01:10Z on 13 Jan (8:10pm EST).
Final recovery efforts were completed on Monday, 13 Jan. The
payload spectrometer channels were once again obtaining GO data by
21:09Z (4:09pm EST), and the scanning telescopes and deep survey
imaging detector were back on-line about an hour later. A number of
clean-up activities were then conducted over the course of the next
few days.
Subsequent analysis of the HGAPS disable anomaly -- the original
cause of all the subsequent events -- have indicated that there is no
hardware problem on-board the spacecraft; the problem seems to be
related to the accuracy of some of the ground-produced products that
were uplinked to the spacecraft. Additional analysis of this event
continues.
2.2 Public GO/RAP Data Release for 1 Mar 1997
---------------------------------------------
by Dr. Nahide Craig, EUVE User Support Scientist
The table below lists the GO/RAP observations that become public on
1 Mar 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 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 MAR 1997:
*** Cycle 4 Targets ***
HU Aqr 144 29 May - 03 Jun 1996 CV:AM go0519
HU Aqr 83 27 Jul - 30 Jul 1996 CV:AM go0520
AG Dra 99 23 Jul - 27 Jul 1996 K0 go0521
Diffuse 99 30 Jul - 02 Aug 1996 Bkgd go0522
RE J1938-461 19 10 Aug - 11 Aug 1996 CV:AM go0523
UV Cet 144 11 Aug - 16 Aug 1996 M5.5e go0524
UV Cet 144 16 Aug - 21 Aug 1996 M5.5e go0525
*** Cycle 3 Targets ***
EUVE J0311-318 4 21 Jan - 21 Jan 1996 NOID go0526
theta 1 Tau 100 21 Jan - 25 Jan 1996 G7III go0527
theta 1 Tau 49 25 Jan - 27 Jan 1996 G7III go0528
theta 1 Tau 29 30 Jan - 01 Feb 1996 G7III go0529
RAP DATA SETS AVAILABLE 1 MAR 1997:
rxrad 83 27 Jul - 30 Jul 1996 AGN rap0076
EUVE J1847+019 68 02 Aug - 10 Aug 1996 WD:DA rap0077
0006+18 19 10 Aug - 11 Aug 1996 NeutSt rap0078
================================================================
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)
URL http://www.cea.berkeley.edu/
telnet www.cea.berkeley.edu 200 (for those without a WWW browser)
o anonymous FTP
ftp ftp.cea.berkeley.edu
Name: anonymous
Password: type_your_full_e-mail_address
o anonymous gopher
gopher ftp.cea.berkeley.edu
o EUVE Electronic Newsletters
Past issues -- available via the 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 CEA can help YOU! For more information see the 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 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 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 Government-Furnished Equipment
----------------------------------
The second major shipment of government-furnished equipment (GFE)
from GSFC to CEA was completed in Jan. On 21 Jan computer hardware
and software arrived for the second strings of the Transportable
Payload Operations Control Center (TPOCC) command and control system
(including a switching system to handle both TPOCC strings), and the
Command Management System (CMS); a single string of the Generic Trend
Analysis System (GTAS) was also included. Personnel from GSFC arrived
at CEA the following day and, during the remainder of that week (22-24
Jan), worked with CEA personnel to install, configure, and integrate
these new systems into the existing CEA operations network. The work
proceeded fairly well, although some unexpected problems precluded
having these systems completely operational by week's end. During the
following weeks CEA personnel were able to complete work on TPOCC and
CMS, although GTAS still needs significant work.
The first of four personal computers (PC) for off-line engineering
analysis were also delivered to CEA as GFE during Jan. This PC has
been completely set up and is now supporting shadow operations (see
below). A second PC will be shipped to CEA in early Feb, with the
final two coming in mid- to late-Mar.
3.2 EPOC Ground Systems Testing
-------------------------------
In early Jan various tests were completed that validated CEA's
ground system components that are necessary for conducting all
spacecraft scheduling activities. Following an engineering interface
test with GSFC's Network Control Center (NCC) on 30 Dec 1996, CEA was
subsequently able to validate its ability to schedule realtime
contacts between EUVE and CEA via the NCC and NASA's TDRS System.
Additional tests in the next two weeks provided validation of the CMS
science planning functions. These validation tests paved the way for
the beginning of scheduling shadow operations on 3 Jan (see below).
Throughout the month of Jan CEA continued to test the realtime
command and control functions of its TPOCC system. CEA and GSFC
personnel were able to resolve a number of problems with the system so
that CEA Flight Operations Team (FOT) members were able to begin
commanding the spacecraft three days per week during the month. This
realtime experience provided the CEA FOT with hands-on TPOCC-based
spacecraft operations training, identifying a number of TPOCC software
and hardware issues that need additional work.
The TPOCC system has only recently been introduced into EUVE
operations. Since launch the GSFC FOT has been operating the
satellite from the EUVE Mission Operations Room (MOR) using the
Multi-Satellite Operations Control Center (MSOCC). In an attempt to
maximize the testing of TPOCC the EUVE Project Office directed that
EUVE operations at GSFC be temporarily moved from the MOR to the GSFC
Systems Operations and Testing Area (SOTA). This move, which was
completed in early Jan, has allowed the GSFC and CEA FOTs to jointly
operate EUVE via TPOCC seven days per week, and has served to identify
additional areas for improvement in the TPOCC system.
The EUVE Flight Software (FSW) group at GSFC will continue to
support the mission during the OEM. To prepare for this support CEA
and FSW personnel were able to validate the interface between CEA and
the GSFC Software Development and Validation Facility (SDVF) for
transferring and manipulating EUVE OBC computer memory images and
other FSW-provided products.
3.3 Shadow Operations Period Begins
-----------------------------------
A major OEM milestone was met in Jan with the beginning of the
shadow operations period. At a joint CEA/GSFC telecon held on 3 Jan
the parties reviewed the relevant performance criteria, after which
GSFC approved the immediate handover of spacecraft scheduling and
command generation functions to CEA (with the GSFC FOT shadowing),
beginning phase one -- spacecraft scheduling -- of the shadow
operations period. At this time GSFC also authorized CEA to perform
realtime command and control activities three days per week. This
transfer of responsibility and authority was completed on schedule.
On 20 Jan CEA assumed responsibility for the additional scheduling
activities of science planning and tape recorder management.
Throughout the month CEA successfully carried out the various
scheduling activities. The Safe-Hold Mode event of 11 Jan and the TOO
to the ALEXIS Transient source on 28 Jan provided particular
challenges to the CEA FOT.
On 31 Jan a follow-up joint CEA/GSFC telecon was held, the goal
this time being to review CEA's readiness to begin the second phase of
the shadow operations period: full-time realtime spacecraft
operations. During this phase two period CEA will schedule and fly
the spacecraft on a full-time basis (single-shift operations seven
days/week) with GSFC shadowing as a backup. After reviewing the
relevant performance criteria GSFC once again granted approval for CEA
to begin realtime spacecraft operations on 3 Feb. This transfer of
responsibility and authority was also completed on schedule.
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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
ceanews@cea.berkeley.edu.
The EUVE project is managed by NASA's GSFC: Bill Worrall, 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 euve@stars.span.nasa.gov.
END-----------EUVE------------ELECTRONIC---------------NEWS-------------END
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