Skip to main content

Alert Notice 181: 1844-21 Nova Sagittarii 1994 [V4332 Sgr] AND Rapid fading of 2337+56 Nova Cassiopeiae 1993 [V705 Cas] AND Erratum from Alert Notice 180

March 2, 1994

1844-21 NOVA SAGITTARII 1994  [Luminous Red Variable in Sgr = V4332 Sgr]

We have been informed the Central Bureau for Astronomical Telegrams (IAU Circular 5942) that S. S. Hayashi (National Astronomical Observatory, Tokyo, Japan) reports that Minoru Yamamoto (Okazaki, Aichi, Japan) discovered a nova in Sagittarius on P-MAX 400 film on February 24.85 UT at photographic magnitude 8.9 and on February 25.84 at photographic magnitude 8.5. The object was confirmed by K. Hirosawa (Aichi, Japan), who reported the brightness on February 25.85 at visual magnitude 8.5 and provided following position for the nova:

R.A. 18h 47m 30s     Decl. -210 21.0'   (1950)

Further magnitude estimates are as follows: Feb. 27.68 UT, 8.53 PEP V (A. Gilmore, Mt. John University Observatory, New Zealand), and 27.68, 8.7 (A. Jones, Nelson, New Zealand) (via Nova Network); and 28.41, 8.5 (C. Scovil, Stamford, CT); Feb 28.41, 8.4 (J. Griese, Stamford, CT); Mar 1.07, 8.0 (D . Overbeek, Edenvale, South Africa); 1.10, 8.0 (Overbeek).

Accompanying is a finder chart for N Sgr 94 prepared by C. Scovil. Please use this chart to observe the nova and telephone your observations to AAVSO Headquarters so we may inform the astronomical community. Please indicate which comparison stars you have used in making your estimates.

Congratulations to M. Yamamoto on his discovery!

RAPID FADING OF 2337+56 NOVA CASSIOPEIAE 1993 [V705 Cas]

As anticipated (see AAVSO Alert Notice 180), this bright nova has faded rapidly, starting with a slow fade from Feb 12 to Feb 15, and since Feb 15 quite reapidly, as indicated by the foolowing observations:

Feb 1.00 UT, 8.3 (J. Bortle, Stormville, NY); 1.02,7.90 PEP V (D. Curott, Florence, AL); 1.09, 8.0 (R. Royer, Lakewood, CA); 1.09, 8.1 (P. Collins, Scottsdale, AZ); 1.10, 7.90 PEP V (B. Hakes, Peoria, IL); 1.10, 8.29 PEP B (Hakes); 1.90, 8.2 (G. Poyner, Birmingham, England); 1.98, 8.1 (F. West, Hanover, PA); 1.99, 8.0 (R. Stewart, Rochelle Park, NJ); 2.04, 8.2 (Poyner); 2.16, 8.4 (Collins); 2.98, 8.2 (West); 3.02, 8.43 PEP V (Curott), 3.05, 8.5 (A. Dill, Wichita, KS); 3.11, 8.4 (D. York, Abiquiu, NM); 3.16, 8.6 (Bortle); 3.17, 8.4 (E. Anderson, Yonkers, NY); 4.78, 8.4 (Poyner); 4.81, 8.8 (L. Kiss, Szeged, Hungary); 5.00, 8.5 (West); 5.07, 8.3 (Anderson); 5.81, 8.6 (Poyner); 5.98, 8.5 (Poyner); 6.16, 8.3 (Royer); 6.19, 8.4 (Poyner); 7.00, 8.4 (West); 7.03, 8.3 (Anderson); 8.99, 8.5 (G. Comello, Groningen, Netherlands); 9.11, 8.1 (Royer), 9.81, 8.5 (Comello); 10.04, 8.45 PEP V (Hakes); 10.12, 8.5 (Royer); 10.23, 8.3 (P. Schmeer, Bischmisheim, Germany); 10.94, 8.3 (Schmeer); 10.97, 8.3 (S. Sharpe, Bar Harbor, ME); 12.01, 8.6 (Schmeer); 12.03, 8.5 (R. Hays, Worth, IL); 12.16, 8.49 (Royer); 12.76, 8.7 (Schmeer); 12.79, 8.6 (Poyner); 13.10, 8.6 (Royer); 14.02, 9.4 (Bortle); 14.02, 9.25 PEP V (Curott); 14.03, 9.0 (Hays); 14.04, 8.8 (Anderson); 14.13, 8.5 (C. Scovil, Stamford, CT); 14.76, 9.0 (Schmeer); 14.80, 8.9 (L. Kiss, Budapest, Hungary); 14.99, 8.9 (P. Dombrowski, Glastonbury, CT); 14.99, 9.0 (Gliba); 15.05, 9.0 (Anderson); 15.73, 9.2 (Szentasko); 15.75, 10.2 (Kiss); 15.80, 10.1 (M. Moeller, Timmendorfer Strand, Germany); 15.80, 9.6 (I. Tepliczky, Budapest, Hungary); 15.87, 9.7 (Szentasko); 15.94, 9.8 (Comello); 16.03, 10.1 (C. Stephan, Sebring, FL); 16.04, 9.9 (Hays); 16.04, 9.7 (Gliba); 16.07, 10.1 (Stephan); 16.13, 9.9 (Royer); 16.74, 10.2 (Szentasko); 16.78, 10.1 (Schmeer); 16.82, 10.3 (Szentasko); 16.82, 10.1 (Schmeer); 16.83, 10.1 (Tepliczky); 16.87, 10.2 (Schmeer); 16.91, 10.1 (Schmeer); 16.91, 10.2 (Comello); 16.94, 10.1 (Schmeer); 17.00, 10.2 (Gliba); 17.00, 10.2 (Dombrowski); 17.01, 10.2 (Stewart); 17.03, 10.2 (P. Walker, Middlebury, VT); 17.03, 10.15 PEP V (Curott); 17.06, 10.1 (W. Dillon, Missouri City, TX); 17.12, 10.2 (H. Guidry, Littleton, NC); 17.18, 10.1 (E. Broens, Mol, Belgium); 17.23, 10.2 (T. Vanmunster, Landen, Belgium); 17.23, 10.3 (Schmeer); 17.75, 10.2 (E. Ofek, Tel Aviv, Israel); 17.75, 10.6 (A. Diepvens, Balen, Belgium); 17.77, 10.5 (Vanmunster); 17.77, 10.5 (Broens); 17.80, 10.6 (Vanmunster); 17.80, 10.6 (Comello); 17.84, 10.6 (Vanmunster); 17.85, 10.3 (Schmeer); 17.93, 10.7 (Schmeer); 18.01, 10.5 (Scovil); 18.03, 10.79 PEP V (Curott); 18.06, 10.6 (Dillon); 18.10, 10.6 (Royer); 18.19, 11.0 (Broens); 18.23, 10.9 (Schmeer); 18.77, 11.1 (Diepvens); 18.78, 11.4 (Schmeer); 18.78, 11.3 (P. Van Cauteren, Aartselaar, Belgium); 18.82, 11.1 (Broens); 18.83, 11.1 (G. Gubbels, Tessenderlo, Belgium); 18.84, 11.2 (Comello); 18.85, 11.4 (Schmeer); 18.86, 11.1 (Diepvens); 18.91, 11.4 (Schmeer); 18.93, 11.1 (Broens); 18.93, 11.0 (Gubbels); 19.0, 11.5 (Dombrowski); 19.00, 11.0 (R. Raphael, S. W. Harbor, ME); 19.00, 11.4 (Sharpe); 19.03, 11.5 (Gliba); 19.05, 11.6 (Guidry); 19.09, 11.3 (Broens); 19.10, 11.2 (Vanmunster); 19.10, 11.2: (Collins); 19.12, 11.4 (Royer); 19.16, 11.1 (Broens); 19.18, 11.3 (Diepvens); 19.22, 11.3 (Diepvens); 19.22, 11.4 (Schmeer); 19.22, 11.3 (Vanmunster); 19.78, 11.8 (Schmeer); 19.83, 11.8 (Schmeer); 19.88, 11.6 (Comello); 20.0, 12.2 (Dombrowski); 20.01, 12.0 (Raphael); 20.73, 12.6 (N. Stoikidis, Larissa, Greece); 20.78, 12.1 (Diepvens); 20.80, 12.3 (Poyner); 21.02, 12.4 (M. Adams, Melbourne, FL); 21.10, 12.7 (R. King, Duluth, MN); 21.13, 12.9 (Royer); 21.20, 12.1 (Vanmunster); 21.94, 12.0 (Diepvens); 22.42, 12.7 (Dombrowski); 23.0, 13.3: (Dombrowski); 25.1, 12.3 (York); 25.14, 12.9 CCD UNFlLTERED (Royer); 25.99, 14.2 (Scovil); 25.99, 14.3 (J. Griese, Rocky Hill, CT); 26.00, <13.8 (Bortle); 27.99, 15.0 (Griese); 28.0, <13.3 (Dombrowski); Mar 1.10, 14.5: (York); 1.12, <14.0 (King); 2.13, 14.6 (York).

The optical fading was accompanied by a rapid brightening, followed by a slower increase, in the near-infrared, as reported by Kidger et al. (IAU Circular 5936) and Garnavich (IAU Circular 5941), respectively. Shore et al. (IAU Circular 5934) also report that the observations of N Cas 93 with the IUE satellite confirm the formation of dust in the nova ejecta during the deep optical decline now underway (IAU Circular 5938).

Once the reaches its minimun brightness it should start to brighten slowly, perhaps for several months, and then resume its decline, so please keep a very close eye on N Cas 93 in the coming months. Accompanying is an "e" scale chart prepared by C. Scovil. Please use this chart in making observations of N Cas 93 and report your observations to AAVSO Headquarters. Please report the comparison stars you used to make your estimates.

ERRATUM FROM ALERT NOTICE 180

In AAVSO Alert Notice 180, we reported that N Cas 93 was discovered by Syuichi Nakano. In fact, it was discovered by Kazuyoshi Kanatsu and the discovery was reported by Syuichi Nakano. We apologize for the error.

 

Many thanks for your valuable observations and dedicated efforts.

Good observing!

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