THE AMERICAN ASSOCIATION OF VARIABLE STAR OBSERVERS
25 Birch Street, Cambridge, MA 02138 USA
Internet: aavso@aavso.org
Tel. 617-354-0484 FAX 617-354-0665
AAVSO ALERT NOTICE 216 November 3,1995
0945+34 SUPERNOVA 1995al IN NGC 3021
We have been informed by Mirko Villi (Forli, Italy) and the Central Bureau for
Astronomical Telegrams (IAU Circular 6255) of the visual discovery of a supernova in
NGC 3021 by Stefano Pesci and Piero Mazza (Milan, Italy) on Nov 1.04 UT, at visual
magnitude 13.0-13.5 using a 0.35-m telescope. They report that nothing unusual was noted
at this location on Oct 25.2 UT to a limiting magnitude of about 16.0. They also report that
no object appears at this position on the Palomar Sky Survey
The supernova is located 15" W and 2.9" S of the nucleus of NGC 3021. The (2000) position
of the supernova is:
RA 09h 5Om 55.97s Dec. +33deg 33m 09.4s (IAU Circ. 6253)
C. Pollas, Observatoire de la Cote d'Azur (OCA) reports that a star of about mag.(V) 14.3
was detected on a 10-min exposure plate with the OCA Schmidt telescope on Nov 2.19 UT.
This object does not appear on the original Palomar Sky Survey (IAU Circ. 6255).
G. Hurst (Basingstoke, England) estimated the brightness of SN 1995a1 at mag 13.2 from
an unfiltered CCD image obtained by M. Armstrong (Rolvenden, UK) on Nov 2.1 UT,
with 0.25-m Schmidt Cassegrain telescope (IAU Circ. 6255). G. Emerson (Golden,
Colorado) estimated the magnitude of SN 1995al at about 13.2 on an unfiltered CCD
image taken with a 0.25-m telescope on Nov 2.5 UT.
Please use the accompanying AAVSO Preliminary "e" scale chart prepared by C. Scovil
using the sequence from the Hippancos Input Catalog (photoelectric), and the Guide Star
Catalog (via vsnet, Kyoto U.), to observe SN 1995al. When reporting observations to
AAVSO Headquarters, please be sure to indicate which chart and which comparison stars
you used to make your estimates.
There is a nearby star east-northeast of the nucleus of NGC 3021, at mag. (V) 16.0 (IAU
Circ. 6255). This star is indicated as mag.14.1 in the Guide Star Catalog.
Congratulations to Stefano Pesci and Piero Mazza for their visual discovery of SN 1995al in
NGC 3021!
FADING OF 1544+28a R CORONAE BOREALIS CONTINUES
R CrB is continuing to fade (see AAVSO Alert Notices 214, 215). Please observe it closely
and report your observations to AAVSO Headquarters. Below is a list of observations of R
CrB that we have received since AAVSO Alert Notice 215, from our observers worldwide by
phone, fax, or email:
Oct 16.75 UT, 9.5, J. Gunther, St. Oze, France; 16.7861, 9.4, M. Biesmans, Essen, Belgium;
16.791, 9.1, D. Rodriguez, Madrid, Spain; 16.81, 9.4, A. Pereira, Carnaxide, Portugal;
16.9861, 9.6, P. Steffey, Daytona Beach, FL; 16.994, 8.9, F. West, Hanover, PA; 16.9944,
9.8, R. A. Komorous, London Ontario, Canada; 17.0125, 9.7, J. Bortle, Stormville, NY;
17.0799, 9.7, W. Dillon, Missouri City, TX; 17.683, 10.1, O. Gabzo, Bhei-Brak, Israel;
17.684, 10.2, O. Shemmer, Ra'anana, Israel; 17.72, 10.1, L. Kiss, Szeged, Hungary; 17.74,
10.3:, J. Csanyi, Szeged, Hungary; 17.75, 10.1, M. Zanotta, Milano, Italy; 17.977, 9.8, P.
Dombrowski, Glastonbury, CT; 17.9993, 10.2, J. McKenna, Upper Montclair, NJ; 18.09,
10.5, G. Rosenberg, Tucson, AZ; 18.13, 10.2, C. Spratt, British Columbia, Canada; 18.76,
10.6, R. Bouma, Groningen, Netherlands; 18.765,10.7, B. Granslo, Nordahl Griegs Vei,
Norway; 18.77,10.4, G. Comello, Groningen, Netherlands; 18.791, 10.5, Rodriguez; 18.80,
11.1, Pereira; 18.8, 10.7, Pereira; 18.812, 20.7, J. Osorio, Madrid, Spain; 18.9903, 10.8,
Komorous; 19.0500,10.9, Dillon;19.09,10.9, Rosenberg;19.6680, 10.9, Gabzo; 19.6715,
10.7, Shemmer; 19.72, 11.3, Kiss; 19.75, 10.9, L. Szentasko, Budapest, Hungary; 19.789,
10.9, M. Westlund, Uppsala, Sweden; 19.812, 11.2, Granslo; 19.852, 10.9, O. Skjaeraasen,
Oslo, Norway; 19.969, 10.9, Dombrowski; 19.9896, 11.3, Steffey; 19.9979, 11.0, C. Stephan,
Sebring, FL; 20.0146, 11.1, G. Gliba, Chagrin Falls, OH; 20.0750,11.2, W. Kaminski, Rapid
City, SD; 20.0778, 10.9, M. Heifner, Denver, CO; 20.09, 11.1, Rosenberg; 20.1021, 11.0,
Kammski; 20.7, 11.5, Szentasko; 20.728, 11.6, Granslo; 20.75, 11.7, Comello; 20.843, 11.8,
Osorio; 21.0382, 11:5, Dillon; 21.7, 11.9, Szentasko; 21.74, 11.5, M. Fonovich, Plomin,
Republic of Croatia; 21.7611, 11.5, Westlund; 21.763, 11.7, G. Poyner, Birmingham,
England; 21.79, 11.6, Comello; 21.812, 11.6, F. Pujol, Madrid, Spain; 21.812, 11.7, J. Sainz,
Madrid, Spain; 21.812,11.6, Rodriguez; 21.812,11.8, Osorio; 21.9861,11.7, Steffey; 22.0090,
11.4, Stephan; 22.7, 12.0, Szentasko; 22.72, 11.7 , Fonovich; 22.791, 11.8, Osorio; 22.9618,
11.6, McKenna; 22.969,12.4, Dombrowski; 22.9785, 11.6, Komorous; 22.9979,11.7, Bortle;
23.0125,11.5, Stephan; 23.75, 11.9, Comello; 24.0229,11.9, T. Hager, New Milford, CT;
24.0444, 11.4, Heifner; 24.0729, 11.7, Kaminski; 24.73, 21.9, Kiss; 24.75, 11.9, Comello;
25.0660, 11.9, Kaminski; 26.0458, 11.8, A. Dill, Wichita, KS; 26.5569, 12.1, D. York,
Abiquiu, NM; 26.74, 11.9, Zanotta; 26.9653, 12.0, R Stewart, Fairlawn, NJ; 26.9861, 12.2,
Bortle; 27.0014, 12.4, Stephan; 27.0014, 12.4, Stephan; 27.771, 11.8, Poyner; 28.0986, 12.2,
Kaminski; 28.73, 12.3, Zanotta; 28.770, 12.8, Osorio; 29.74, 12.1, Comello; 29.770, 12.8,
Osorio; 29.9757, 12.2, Komorous; 30.69, 12.5, Comello; 30.9840, 12.5, Bortle; 30.9903, 12.4,
Komorous; 31.7368,12.9, Zanotta; Nov 2.75 UT, 12.1, Szentasko.
FADING OF 1510+82 Z URSAE MINORIS
The recently re-classified R Coronae Borealis star, Z UMi (see AAVSO Alert Notice 195), is
fading as indicated by the following observations:
Sep 02.880 UT, 11.0, G. Poyner, Birmingham, England; Oct 01.82 UT, 11.7, G. Comello,
Groningen, Netherlands; 04.814,12.3, Poyner; 6.87,11.8, Comello; 08.826,12.2, Poyner;
9.9535, 11.6, J. Bortle, Stormville, NY; 10.794, 12.4, Poyner; 15.815, 12.5, Poyner; 17.0132,
12.1, Bortle 18.76, 12.2, R. Bouma, Gronigen, Netherlands; 18.838, 12.4, Poyner; 19.76,
12.3, L. Szentasko, Budapest, Hungary; 20.78, 12.3, Comello; 20.853, 12.4, Poyner; 21.813,
12.4, Poyner; 21.87, 12.1, Comello; 23.0271, 12.3, Bortle; 24.83, 12.4, Comello; 27.0139,
12.3, Bortle; 27.787, 12.4, Poyner; 28.905, 12.4, Poyner; 29.967, 12.4, Poyner; Nov 02.76,
12.8, Szentasko.
Accompanying is a "d" scale AAVSO Preliminary chart, prepared by C. Scovil, using
photoelectric V) sequence of Grenon et al, and R. Stanton. Please use this chart to
observe Z UMi and report which chart and which comparison stars you used in making
your estimates.
CHARTS AVAILABLE ON AAVSO FTP SITE
Chart links are obsolete; 11/2013 create charts using VSP at http://www.aavso.org/vsp
We have prepared electronic copies of the AAVSO charts for SN 1995al and Z UMi
mentioned in this Alert Notice. It is available from our FTP site:
ftp.aavso.org (198.116.78.2), in /pub/alert216
The answering machine at AAVSO Headquarters is on nights and weekends for your
convenience. Please call our charge-free number (800-642-3883) to report your
observations. We also encourage observers to send observations by fax to 617-354-0665 or
by e-mail through the Internet to observations@aavso.org.
Many thanks for your significant astronomical observations and efforts.
Good observing!
Janet A. Mattei
Director
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