Central Bureau for Astronomical Telegrams
IAUC 2292: SN IN M101; 1970g; 1970m
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Read IAUC 2293
Circular No. 2292
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Cable Address: SATELLITES, NEWYORK
Western Union: RAPID SATELLITE CAMBMASS
SUPERNOVA IN M101
Dr. W. F. van Altena, Department of Astronomy and Astrophysics,
University of Chicago, writes: "The following two positions (and
their mean errors) of the supernova in M101 were computed from
measurements by E. Vilkki of two plates taken with the 102-cm refractor
and the 104-cm reflector of the Yerkes Observatory by E. Vilkki and
N. Walborn. The positions, computed by E. Vilkki and W. van Altena,
are based on seven and nine reference stars from the Astrographic
Catalogue corrected to the AGK2 system. The effects of differential
color refraction for the 102-cm refractor plate, Kodak 103a-G plus a
GG 14 filter, are less than 0".01, while for the 104-cm reflector
plate, unfiltered Kodak 103a-G, they are Delta-R.A. ~ +0s.08, Delta-Decl. ~ -0'.1. The
following positions have been corrected for the effects of
differential color refraction:
1970 UT H.A. R. A. (1950) Decl. (1950)
102-cm Aug. 6 +5h36m 14 01 14.64 +/- 0s.06 +54 28 54.7 +/- 0".5
104-cm Aug. 6 +4 09 14 01 14.65 +/- 0s.06 +54 28 54.8 +/- 0".5
The accuracy of the positions is limited by that of the AG positions.
The large focal ratio of the 102-cm refractor, f/19.4, has
suppressed the image of the underlying H II region, while for the
104-cm reflector at f/8 a slight trace of the H II region Is visi-
ble. The effect of the H II region on these positions should
therefore be negligible."
COMET ABE (1970g)
B. Milet, Nice Observatory, communicates the following precise
positions. On October 28 the cometary image was very diffuse.
1970 UT R. A. (1950) Decl.
Oct. 23.76997 16 01 11.77 +11 38 58.1
23.77758 16 01 11.58 +11 38 43.9
28.76809 15 59 43.3 + 9 12 16.2
Nov. 3.73060 15 58 18.73 + 6 37 49.8
Mr. D. Milon, Sky and Telescope, reports that J. E. Bortle,
Stormville, New York, found the comet to be unusually bright on
November 7.0, the Bobrovnikoff standard magnitude being estimated
as 6.5 +/- 0.2. On November 17.0 W. Singer, Keene, New Hampshire,
also estimated the magnitide as 6.5.
COMET SUZUKI-SATO-SEKI (1970m)
The following precise positions have been reported:
1970 UT R. A. (1950) Decl. Mag. Observer
Oct. 20.41690* 15 58 27.71 - 4 28 24.6 Seki
22.70417 16 13 02.83 - 2 01 09.7 7.0 Chernykh
23.73742 16 19 20.55 - 0 56 16.9 Milet
23.75300** 16 19 25.98 - 0 55 22.8 "
27.39809 16 40 15.68 + 2 42 18.8 Seki
27.72706 16 42 03.17 + 3 01 01.2 Mrkos
28.40926 16 45 42.78 + 3 39 32.5 Seki
28.74488 16 47 29.6 + 3 58 11.6 Milet
28.75457 16 47 32.6 + 3 58 41.5 "
29.40226 16 50 56.39 + 4 34 21.1 8.4 Seki
29.40434 16 50 57.06 + 4 34 28.3 "
30.73691 16 57 46.93 + 5 45 45.9 Mrkos
Nov. 1.68343 17 07 24.66 + 7 25 37.2 8 Chernykh
1.69558 17 07 27.94 + 7 26 14.4 "
3.74307 17 17 11.97 + 9 05 41.5 Milet
3.76627 17 17 19.16 + 9 06 39.8 "
4.39514 17 20 12.62 + 9 36 18.2 9 Seki
5.76463 17 26 25.97 +10 38 31.7 8.5 Waterfield
9.40382 17 42 15.99 +13 13 05.2 Seki
11.39115 17 50 32.1 +14 31 09 10 "
12.68889 17 55 41.58 +15 19 52.4 11 Antal
12.70709! 17 55 50.54 +15 20 23.1 Cristescu
13.67094 17 59 43.24 +15 55 35.8 "
13.69864 17 59 49.33 +15 56 40.5 "
15.67033 18 07 31.87 +17 05 29.1 10-11 Chernykh
15.67891 18 07 33.90 +17 05 47.0 "
16.41806 18 10 24.02 +17 30 44.5 12 Seki
16.66655! 18 11 20.64 +17 39 02.0 Cristescu
16.69460 18 11 27.56 +17 40 14.4 "
16.72971 18 11 35.09 +17 41 06.3 Milet
16.74113 18 11 37.84 +17 41 29.8 "
21.72197 18 30 01.55 +20 16 30.7 "
21.73721 18 30 04.78 +20 16 50.3 "
T. Seki (Kochi Observatory). *Measurer: H. Kosai.
N. S. Chernykh (Crimean Astrophysical Observatory). Diffuse coma
with central condensation, slight on Nov. 1, faint on Nov. 15.
Reduced at I.T.A., Leningrad. CoiTinunicated by G. R. Kastel'.
B. Milet (Nice Observatory). **Replaces that on IAUC 2285.
A. Mrkos (Klet Observatory).
R. L. Waterfield (Woolston Observatory).
M. Antal (Skalnate Pleso Observatory). Diffuse with condensation.
C. Cristescu (Bucharest Observatory). ! Bad images.
1970 December 4 (2292) Brian G. Marsden
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