Skip to main content

Alert Notice 142: Nova Ophiuchi 1991 AND Nova in the Large Magellanic Cloud 1991 AND Supernova 1991T in NGC 4527 AND Nova Herculis 1991 AND Nova Centauri 1991

We recently released a significant update to the backend systems for the AAVSO website. While most of the bugs introduced by this update have been fixed, there may still be problems we haven't fixed. If you run into a problem, please email webmaster@aavso.org

THE AMERICAN ASSOCIATION OF VARIABLE STAR OBSERVERS
25 Birch Street, Cambridge, MA 02138 USA
BITNET: aavso@cfa8 SPAN: nssdca::cfa8::aavso
Tel. 617-354-0484 FAX 617-354-0665

AAVSO ALERT NOTICE 142 (April 19, 1991)

NOVA OPHIUCHI 1991

The Central Bureau for Astronomical Telegrams informs us (via A. Gilmore from
F. Bateson) that P. Camilleri (Cobram, Victoria, Australia) photographically
discovered a nova on April 11.62 UT at about photographic magnitude 10. The
precise position (1950.0, R. McNaught) of this nova is:

   RA 17h 17m 14.02s Decl. -26deg 43' 27.1"

The nova was spectroscopically confirmed by astronomers at Ohio State and
Arizona State Universities on April 18.48 UT. "The spectrum is that of a classical
nova and appears to resemble that of Nova Vul1987 (QV Vul) early in its outburst."
Recent observations of N Oph 91 include: Mar 23 UT <12 (P. Camilleri, photographic);
Apr. 12.55, 10.7 (D. Seargent); 13.46, 10.5 (A. Jones and D. Lester); 13.55, 10.5
(P. Williams); 13.56, 10.5 (D. Seargent); 15.46,9.9 (A Jones); 15.56, 11.0
(D. Seargent); 16.67, 10.68 (A Gilmore, photometric V); 17.104, 10.3 (P. Schmeer);
18.083, 10.3 (P. Schmeer).

Please use the accompanying "d" scale chart to estimate the nova's brightness and
report your observations to AAVSO Headquarters.

Congratulations to P. Camilleri on this discovery!

NOVA IN THE LARGE MAGELLANIC CLOUD 1991

AAVSO member William Liller (Vina del Mar, Chile) reports his PROBLICOM discovery of
a nova in the Large Magellanic Cloud on April 18.04 UT at photographic magnitude
12.3. The Central Bureau for Astronomical Telegrams reports the precise (1950.0,
R. McNaught) position of this nova as:

   RA 05h O4m 12.7s Decl. -70deg 22' 16.2"

R. McNaught notes that no image appears at this position on the UKST J, R, and I
and the ESO B and R surveys. Recent visual and photovisual observations of N LMC 91
include:

Apr. 11.43 UT  20 R. McNaught;    16.42  <14.5 G. Garradd;
12.41   19.5 R. McNaught;   16.50  <13 P. Camilleri;
13.41   19 R. McNaught;    18.036  12.3 W. Liller   (minus UV filter);
14.5   < 13 P. Camilleri;   18.041  12.3 W. Liller   (minus UV filter);
15.120   < 14 W. Liller (red filter);   18.53  12.4 P. Camilleri;
15.5   < 13 P. Camilleri;   19.40  12.6 P. Camilleri;
16.40  15 R. McNaught

The nova is plotted on the accompanying excerpt from the AAVSO Variable Star
Atlas
and the photograph from the Supernova Search Charts Handbook (Thompson and
Bryan). Please use the sequence on the accompanying SN 1987 A chart to observe
this nova, and report your estimates to AA VSO Headquarters. 

Congratulations to Bill on his latest discovery!

SUPERNOVA 1991T IN NGC 4527

Recent observations of this supernova include:

Apr.  17.01 UT  12.5 H. Dahle;  April 19.1910 12.7 S. Knight;
17.06   12.3 B. Granslo ;  19.2313 12.7 S. Knight;
17.94   12.4 B. Granslo;   19.2444 12.6 S. Knight;
18.049   12.5 P. Schmeer;   19.3549 12.6 S. Knight;
19.0944  12.7 S. Knight

NOVA HERCULIS 1991

Recent visual observations of N Her 91 include: Apr. 16.99 UT, 12.0 (B. Granslo);
17.073, 12.6 (P. Schmeer); 17.028, 12.4 (B. Granslo); 17.056, 12.3 (B. Granslo);
18.086, 12.7 (P. Schmeer); 18.5, 12.7 (R. Royer).

Accompanying is a "d" scale chart for this nova. Please continue to monitor Nova
Her 91, and .continue to call your observations in to Headquarters.

NOVA CENTAURI 1991

W. Liller reports the following photographic observations of N Cen 91: April
15.12 UT, 11.2; 17.01, 11.2; 18.03, 11.2. D. Overbeek reports N Cen 91 at
approximate visual magnitude 12.2 on April 19.83 UT.

Please use the accompanying "d" scale chart for this nova to continue monitoring Nova Cen
91, and report your observations to AAVSO Headquarters.

The answering machine at Headquarters (617-354-0484) is kept on nights and weekends.
Please call in your observations so we may relay them to the Central Bureau for
Astronomical Telegrams.

Janet Mattei, who is away, and I thank you for your efforts and astronomical
contributions! 

Clear Skies! Good Observing!

Elizabeth O. Waagen
Senior Technical Assistant

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

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