Central Bureau for Astronomical Telegrams
IAUC 4222: 1986e; VY Aqr
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Circular No. 4222
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
TWX 710-320-6842 ASTROGRAM CAM Telephone 617-495-7244/7440/7444
COMET MACHHOLZ (1986e)
Improved parabolic orbital elements from MPC 10759:
T = 1986 Apr. 24.4847 ET Peri. = 20.5896
Node = 89.5514 1950.0
q = 0.143660 AU Incl. = 76.2613
1986 ET R.A. (1950.0) Decl. p r m1
May 28 22 07.65 +45 34.4
30 21 38.84 +45 24.3 0.486 1.064 11.2
June 1 21 08.61 +44 43.7
3 20 37.83 +43 29.1 0.464 1.150 11.4
5 20 07.54 +41 39.7
7 19 38.68 +39 18.5 0.460 1.234 11.7
9 19 11.99 +36 31.5
11 18 47.88 +33 26.7 0.476 1.315 12.1
13 18 26.48 +30 12.8
15 18 07.72 +26 57.3 0.510 1.394 12.5
17 17 51.38 +23 46.3
19 17 37.22 +20 44.0 0.561 1.471 12.9
21 17 24.96 +17 53.0
23 17 14.34 +15 14.5 0.625 1.546 13.4
25 17 05.14 +12 48.8
27 16 57.15 +10 35.5 0.701 1.620 13.8
Total visual magnitude estimates: May 13.44 UT, 9.8 (R. Keen,
Mt. Thorodin, CO, 0.30-m reflector); 14.46, 10.2 (G. Rattley,
Magma, AZ, 0.25-m reflector); 15.48, 10.3 (D. E. Machholz, San
Jose, CA, 0.15-m reflector); 16.46, 11.7 (Rattley). The May 13.4
exposures at the Lowell Observatory (IAUC 4217) showed a 3' tail
to the northwest. A near-simultaneous exposure by G. Emerson, Mt.
Thorodin, CO, shows a broad (covering ~ 40 deg of p.a.) tail 4' long
centered in p.a. 312 and an antitail 2' long in p.a. 159.
VY AQUARII
Further visual magnitude estimates: May 7.10 UT, 11.1 (A.
Perez, Paris, France); 8.10, 11.2 (Perez); 9.67, 11.1 (R. H.
McNaught, Coonabarabran, N.S.W.); 11.83, 11.4 (McNaught); 13.82,
11.5 (McNaught); 14.78, 11.8 (McNaught); 15.80, 12.3 (McNaught);
16.83, 12.7: (McNaught); 18.62, 15.0: (McNaught); 20.78, 14.7
(McNaught); 21.82, 14.9 (McNaught; 23.79, 12.4 (McNaught).
1986 May 27 (4222) Brian G. Marsden
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