Skip to main content

Alert Notice 201: 0740+73 Supernova 1995E in NGC 2441 AND Important reminder [CV observations for Astro-2, EUVE, Voyager, and ASCA] and Thanks [CV observations for Keele U. request and Hipparcos red variables for calibration]

The membership database is currently undergoing upgrading/testing. Web functions that involve an interface with the member database (webobs, etc.) may experience intermittent problems. We hope to have this issue resolved within 24 hours (by 5pm Eastern Time on October 1st or 12:00 UT). Thank you for your patience.

THE AMERICAN ASSOCIATION OF VARIABLE STAR OBSERVERS
25 Birch Street, Cambridge, MA 02138 USA
BITNET: aavso@cfa SPAN: cfa::aavso
INTERNET: aavso@cfa.harvard.edn
Tel. 617-354-0484 FAX 617-354-0665

AAVSO ALERT NOTICE 201 (February 23,1995)

0740+73 SUPERNOVA 1995E IN NGC 2441

We have been informed by the Central Bureau for Astronomical Telegrams (IAU Circular
6137
) and by Guy Hurst, editor of The Astronomer, of the discovery of a supernova in
NGC 2441 by Alessandro Gabrielcic, Agordo, Italy, on February 20.850 UT on a CCD
frame at V magnitude about 15.0. SN 1995E is located 7 seconds east and 22 seconds south
of the galaxy's center. P. Molaro (who reported the discovery to the IAU Circular), C.
Boehm, and G. Tessicini, Trieste Observatory, report that the spectrogram they have
obtained suggests that SN 1995E to be a type-Ia supernova.

The position of NGC 2441 is:

   RA = 07h 52.2m Decl. = +73o 02' (2000)

Accompanying are a finder chart from the AAVSO Variable Star Atlas showing the location
of the galaxy and a CCD image from the Deg Space CCD Atlas: North by J.C. Vickers.
Until we have made a finder chart for this field we recommend that, if the supernova
continues to brighten, observers make use of the comparison star sequence in the field of Z
Cam, which is near by.

Sincere congratulations to Allessandro Gabrielcic on his discovery!

IMPORTANT REMINDER and THANKS

a. Observations of cataclysmic variables for Astro-2, EUVE, VOYAGER, and ASCA
satellites
:

The NASA satellite Astro-2 is scheduled to be launched from the space shuttle on March 2
at 6:37 UT 1995. One of the observing programs to be carried out with Astro-2 is the
monitoring of cataclysmic variables with various instruments aboard Astro-2, and for this
program the team of astronomers is depending on the observations reported by variable
star observers worldwide that we will communicate to them every day (see AAVSO Alert
Notice 197
). Please monitor the cataclysmic variables below closely and inform us of your
observations daily from March 2 through March 16 so that we may inform the team of
astronomers of Astro-2 daily.

0058+40 RX And 0409-71 VW Hyi 1247-28 EX Hya
0139+37 AR And 0749+22 U Gem 1813+49 AM Her
0207-63 WX Hyi 0804+28 YZ Cnc 1934+30 EM Cyg
0219+27 RW Tri 0814+73 Z Cam 2138+43 SS Cyg
0309-22 EF Eri  

The highest priority targets continue to be VW Hyi, WX Hyi, YZ Cnc, and also U Gem
and Z Cam. However, the other targets are also important, particularly if any of them go
into outburst. Additional targets of opportunity, if any of them go into outburst, are SW
UMa, OY Car, BV Cen, and HL CMa.

Checking the recent data that you, our observers, have been submitting, we predict that
several of the stars on the list will go into outburst during the Astro-2 mission, and your
early information and alerts on these outbursts are particularly crucial to the success of the
Astro-2 observing runs. So, please monitor these stars every night if you can and report
your observations EVEN IF THE STARS ARE AT MINIMUM, daily to AAVSO
Headquarters by 9:30 a.m.(EST) - 2:30 (GMT) - so that we may inform the team of
astronomers daily.

b. Thank you!

Sincere thanks to all observers who monitored the nine dwarf novae that were in the
observing program of astronomers at Keele University early this month (AAVSO Alert
Notice 199
) We particularly thank W. Albrecht, J. Bortle, T. Burrows, A. Dill, W. Dillon,
P. Dombrowski, G. Dyck, R. Harvan, R. Hayes, R. King, J. McKenna, D. Overbeek, P.
Robbins, R. Royer, C. Stephan, W. Stewart, B. A. Tekatch, and D. York. Your valuable
astronomical contributions are very much appreciated by all of us here and by the
astronomers who carried out interesting observations on these stars.

Thanks also to all observers who have monitored Hipparcos Red Variables throughout
February for photometric calibration (AAVSO Alert Notice 196). Your observations, ag
are very much appreciated and have been very helpful.

Chart links are obsolete; 11/2013 create charts using VSP at http://www.aavso.org/vsp

Observers are welcome to use our charge-free number (800-642-3883) to report
observations. The answering machine is on nights and weekends for your convenience.
For observers who cannot use this number, please send a list of your phone calls so we may
reimburse your telephone charges. We also encourage observers to send observations by
fax at 617-354-0665 or by e-mail through the Internet at aavsoQa cfa.harvard.edu.

Many thanks for your efforts and valuable astronomical contributions.

Good observing!

Janet A. Mattei
Director

---------------------------------------------------‬
SUBMIT OBSERVATIONS TO THE AAVSO

Information on submitting observations to the AAVSO may be found at‭:‬
http‭://‬www.aavso.org/webobs

ALERT NOTICE ARCHIVE AND SUBSCRIPTION INFORMATION

An Alert Notice archive is available at the following URL‭:‬
http‭://‬www.aavso.org/alert-notice-archive

Subscribing and Unsubscribing may be done at the following URL‭:‬
http‭://‬www.aavso.org/observation-notification#alertnotices

-------------------------------------------------

Please support the AAVSO and its mission -- Join or donate today:
http://www.aavso.org/apps/donate/

AAVSO 49 Bay State Rd. Cambridge, MA 02138 aavso@aavso.org 617-354-0484