THE ASTRONOMER Electronic Circular No 488 1991 Feb 23 15.40UT
Ed:Guy M Hurst, 16,Westminster Close, Kempshott Rise, Basingstoke,
Hants, RG22 4PP, England. Telephone: (0256)471074 Int:+44256471074
Telex: 9312111261 Answerback: TA G Microlink: MAG60138
JANET:GMH @ UK.AC.CAM.ASTRONOMY.STARLINK GUYH@UK.AC.SUSSEX.CLUSTER
TELECOM GOLD: 10074:MIK2885 PRESTEL 256471074
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PERIODIC COMET TAKAMIZAWA (1991h)
J. V. Scotti, University of Arizona, reports his recovery of this
comet with the Spacewatch telescope at Kitt Peak. There is a tail
about 30" long in p.a. 285-290 deg. The following observations
indicate a correction of Delta(T) = -0.5 day to the prediction on
MPC 13045:
1991 UT R.A. (1950) Decl. m1
Feb. 17.48591 14 07 23.86 - 0 33 03.8
17.50666 14 07 24.79 - 0 33 01.5 19.9
17.52752 14 07 25.76 - 0 32 57.4 19.6
19.45043 14 08 54.13 - 0 27 22.5 19.6
Orbital elements by B. G. Marsden, Center for Astrophysics,
from 117 observations 1984-1991, mean residual 1".2:
Epoch = 1991 Aug. 12.0 ET
T = 1991 Aug. 17.88914 ET Peri. = 147.64304
e = 0.5746123 Node = 124.25069 1950.0
q = 1.5896944 AU Incl. = 9.48335
a = 3.7370488 AU n = 0.13643033 P = 7.224 years
IAUC 5192
The following ephemeris is derived from a programme by N.James and
the associated magnitude formula is from NK 506 by S.Nakano:
m = 11.5 + 5.0 log R + 15.0 log r
Date R.A. (1950) Dec. R r Elong Mag. Motion
h m o ' (AU) (AU) o "/hr P.A.
1991 Feb
13.00 14 3.72 -0 43.6 1.809 2.383 113.7 18.4 32 81
23.00 14 11.44 -0 15.3 1.643 2.321 121.7 18.1 27 70
1991 Mar
5.00 14 17.26 +0 30.5 1.490 2.260 130.1 17.7 22 53
15.00 14 20.82 +1 33.9 1.351 2.199 138.7 17.3 20 26
25.00 14 21.78 +2 52.6 1.230 2.138 147.3 16.9 21 356
1991 Apr
4.00 14 20.03 +4 21.4 1.129 2.079 155.2 16.5 26 333
14.00 14 15.73 +5 52.0 1.048 2.022 160.5 16.2 30 317
24.00 14 9.48 +7 12.5 0.990 1.966 160.3 15.9 31 305
1991 May
4.00 14 2.39 +8 10.0 0.952 1.912 154.5 15.6 28 292
14.00 13 55.80 +8 34.1 0.934 1.861 146.2 15.4 22 273
24.00 13 51.10 +8 18.6 0.932 1.812 137.4 15.2 15 235
1991 June
3.00 13 49.35 +7 23.3 0.944 1.767 129.0 15.1 19 181
13.00 13 51.12 +5 51.7 0.965 1.726 121.2 15.0 30 153
23.00 13 56.64 +3 49.1 0.994 1.690 114.3 14.9 44 141
1991 July
3.00 14 5.80 +1 22.3 1.029 1.658 108.3 14.9 57 134
13.00 14 18.34 -1 22.7 1.069 1.632 103.0 14.8 68 129
23.00 14 34.03 -4 19.9 1.113 1.612 98.3 14.8 78 125
RX ANDROMEDAE (cf E443)
Numerous observers have reported the end of the standstill of this
variable. The following representative results are by O.Midtskogen,
Norway (e-mailed by B.Granslo):
Jan 8.92UT, 11.4; 10.88, 11.3; 15.81, 11.3; 16.76, 11.5,
17.89, 11.3; 20.92, 11.3; 21.76, 11.3; 23.77, 11.4; 26.72, 11.3;
28.74, 11.3; Feb 7.33, 11.4; 11.81, 11.5; 13.78, 11.5; 17.77, 12.0;
20.83, 13.6;
Guy M Hurst