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Alert Notice PEP #00: Special Alert Notice to AAVSO Photoelectric Observers [2337+56 Nova Cassiopeiae 1993] [V705 Cas]

Note: This Notice was originally titled:
SPECIAL AAVSO ALERT NOTICE TO AAVSO PHOTOELECTRIC OBSERVERS

It has been given the somewhat odd name "Alert Notice PEP #00" in 2016 so it will fit in with the other special PEP Alert Notices created by Aaron Price in 2001-2004. Eventually all of these special PEP Alert Notices will be renamed to something more consistent with Alert and Special Notice procotols. EOW 5/5/2016

December 22, 1993

THE AMERICAN ASSOCIATION OF VARIABLE STAR OBSERVERS
25 Birch Street, Cambridge, MA 02138 USA
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Tel. 617-354-0484 FAX 617-354-0665

SPECIAL AAVSO ALERT NOTICE TO PHOTOELECTRIC PHOTOMETRISTS [2337+56 NOVA CASSIOPEIAE 1993]

A bright nova in Cassiopeia was discovered by Kazuyoshi Kanatsu, of Matsue Japan, on December 7.47 UT, and confirmed on December 11.42 UT. Below is a section from AAVSO Alert Notice 179, giving information on this nova.

N Cas 93 is still bright and is oscillating between magnitudes 6 and 7, and is an excellent candidate for photoelectric observations. The three stars that are recommended for use in making photoelectric observations are indicated on the accompanying AAVSO chart. They are:

                           R.A.   (1950)     Dec.           V       B     Spectrum

1. SAO 35682   23h 39m 29s   +56  58' 58"   6.24   7.23      G8

2. SAO 35665   23   38   36     +57  33  42    7.23   7.41       A

3. SAO 35668   23   38   48     +57  16  39    8.29   8.61       -

(from Geneva Observatory [Grenon et al.] photoelectric data)

Please report your oservations of N Cas 93 with the exact time and the stars used for comparison and check. Please monitor this nova sveral times during the night, if possible, to detect the short-period oscillations that are being reported. If you have B and R filters, multicolor observations are very much recommended. Please call in your observations to AAVSO Headquarters, using the charge free number (800-642-3883), or fax your observations, so we may disseminate them to the astronomical community.

Thank you very much for your efforts and valuable observations. Best wishes for Happy Holidays and a Happy New Year!

Clear skies,

 

Director

+  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  + 

from AAVSO Alert Notice 179:

2337+56 NOVA CASSIOPEIAE 1993

Syuichi Nakano reports the photographic discovery of a nova in Cassiopeia by Kazuyoshi Kanatsu of Matsue, Shimane, Japan, on December 7.47 UT at photographic magnitude 6.5 on a T-Max 400 exposure with a 55-mm f/2.8 lens. This discovery was confirmed by the discoverer on December 11.42 at photographic magnitude 6.5. Other estimates include: Dec. 5.44 UT, <10.0 (A. Tago, Tsuyama, Okayama, Japan; T-Max); 7.47, 7.5 (Tago); 11.63, 6.5 (S. Otomo, Kiyosato, Yamanishi, Japan, visual); 11.65, 6.4 (K. Tomita, Tokyo, Japan, visual) (IAU Circular 5902).

K. Kawanishi, Akou, Hyogo, Japan, has determined the 1950 position of N Cas 93:

RA. 23h 39m 22.36s Dec. +57o 14' 23.7"

B. Skiff, Lowell Observatory, reports that a precursor candidate appears on both the B and R plates of the Palomar Sky Survey at B magnitude 18 and B-R ~ +1.0 (IAU Circular 5904).

Peter Collins (Scottsdale, AZ) reports an independent visual discovery of N Cas 93 on Dec 13.29 UT at magnitude 6.0, with a second observation on Dec 13.40 at 6.2. The nova has been around magnitude 6.5, as reported by observers around the world, and shown by the following recent observations: Dec 14. 01 UT, 6.0 (G. Poyner, Birmingham, England); 14.12, 6.3 (R. Stewart, Rochelle Park, NJ); 14.15, 5.9 (C. Scovil, Stamford, CT); 14.18, 6.4 (P. Schmeer, Bischmisheim, Germany); 14.22, 6.1 (W. Dillon, Missouri City, TX).

N Cas 93 is close to the Mira variable 2339+56 Z Cas. The accompanying ''b'' chart of Z Cas, prepared by C. Scovil, shows Nova Cas 1993 together with comparison stars with photoelectric (V) magnitudes from Geneva Observatory (M. Grenon et al.) and Lowell Observatory (B. Skiff). Please monitor this bright nova closely and report your observations, indicating the comparison stars used, to AAVSO Headquarters using the charge-free number (800-642-3883). The AAVSO answering machine is on nights and weekends for your convenience.

Our congratulations to Kazuyoshi Kanatsu and Peter Collins!

 

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