Central Bureau for Astronomical Telegrams
IAUC 2240: 1936 IV; 1969a
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Circular No. 2240
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
PERIODIC COMET JACKSON-NEUJMIN (1936 IV)
The orbit of this comet has been redetermined by B. G. Marsden
from 33 observations 1936 September 9 to November 5. Perturbations
due to all nine planets have been applied in order to obtain the
following osculating elements and ephemeris for 1970. In 1956 the
comet passed within 0.8 AU of Jupiter. The four variation ephemerides
are from initial orbits with revolution periods differing by
up to approximately +/- 6 days (believed the possible uncertainty in
the period), and the full effect of perturbations has again been
taken into account. Although the comet has made four revolutions
about the sun since 1936, differential perturbations cause the
corresponding range in perihelion time in 1970 to be some +/- 15 days
only. The perihelion time predicted at the time of the 1953 return
(the only other occasion when there was a chance that the comet
could be recovered) was certainly too early, probably by about a
month; and although plates were in fact taken by E. Roemer at the
region corresponding to the revised prediction, the 30 per cent
error in the assumed motion significantly decreased the chance that
images of the comet could be found on them. A revised estimate of
the comet's brightness suggests that it would not have been brighter
than magnitude 19. The central condensation of the comet is
expected to be a magnitude or two brighter in 1970, and conditions
for the comet's recovery will be particularly favorable if Delta-T
happens to be positive.
T = 1970 Aug. 13.7513 ET Epoch = 1970 Aug. 2.0 ET
Peri. = 196.2776 e = 0.654439
Node = 163.1903 1950.0 a = 4.130544 AU
Incl. = 14.1092 n = 0.1174068
q = 1.427353 AU P = 8.395 years
1970 ET R. A. (1950) Decl. Delta r Mag.
June 3 23 09.49 + 3 46.9 1.446 1.646 19.5
13 23 37.94 + 5 40.5
23 0 07.76 + 7 24.7 1.237 1.547 18.9
July 3 0 38.91 + 8 53.5
13 1 11.10 +10 00.2 1.072 1.474 18.3
23 1 43.89 +10 38.9
Aug. 2 2 16.60 +10 44.9 0.953 1.434 18.0
12 2 48.30 +10 15.3
22 3 18.05 + 9 11.0 0.873 1.431 17.8
Sept. 1 3 44.90 + 7 35.2
11 4 07.96 + 5 33.8 0.823 1.465 17.7
21 4 26.59 + 3 14.5
Oct. 1 4 40.26 + 0 46.1 0.796 1.532 17.9
11 4 48.64 - 1 41.1
21 4 51.80 - 3 55.5 0.796 1.627 18.1
31 4 50.12 - 5 45.1
Nov. 10 4 44.60 - 6 58.2 0.839 1.742 18.5
20 4 36.78 - 7 27.5
30 4 28.35 - 7 11.9 0.945 1.871 19.1
Dec. 10 4 20.97 - 6 16.2
20 4 15.77 - 4 50.4 1.129 2.009 19.8
Mag. = 16.5 + 5 log Delta + 10 log r
1970 ET dT ~ -15d dT ~ -7d dT ~ +7d dT ~ +15d
June 3 23 46 + 4.7 23 28 + 4.2 22 50 + 3.3 22 29 + 2.9
13 0 17 + 6.6 23 58 + 6.1 23 16 + 5.2 22 54 + 4.7
23 0 49 + 8.3 0 29 + 7.9 23 44 + 6.9 23 20 + 6.4
July 3 1 22 + 9.7 1 01 + 9.3 0 14 + 8.4 23 47 + 7.9
13 1 56 +10.7 1 34 +10.4 0 45 + 9.6 0 16 + 9.0
23 2 29 +11.3 2 08 +11.0 1 16 +10.2 0 45 + 9.7
Aug. 2 3 01 +11.4 2 40 +11.1 1 48 +10.3 1 16 + 9.7
12 3 32 +11.0 3 12 +10.7 2 20 + 9.7 1 46 + 9.0
22 4 00 +10.2 3 41 + 9.7 2 50 + 8.5 2 16 + 7.5
Sept. 1 4 26 + 8.9 4 07 + 8.3 3 17 + 6.6 2 43 + 5.3
11 4 48 + 7.3 4 30 + 6.6 3 40 + 4.2 3 06 + 2.4
21 5 07 + 5.5 4 48 + 4.5 3 59 + 1.5 3 25 - 0.8
Oct. 1 5 21 + 3.6 5 02 + 2.3 4 12 - 1.3 3 37 - 4.1
11 5 30 + 1.6 5 11 + 0.1 4 20 - 4.1 3 45 - 7.2
21 5 34 - 0.3 5 15 - 1.9 4 23 - 6.5 3 47 - 9.7
31 5 34 - 2.0 5 14 - 3.7 4 20 - 8.4 3 45 -11.4
Nov. 10 5 30 - 3.2 5 09 - 4.9 4 15 - 9.4 3 40 -12.2
20 5 22 - 4.0 5 01 - 5.6 4 08 - 9.6 3 35 -12.0
30 5 13 - 4.1 4 52 - 5.6 4 01 - 9.1 3 31 -11.0
Dec. 10 5 03 - 3.6 4 43 - 4.9 3 56 - 7.8 3 29 - 9.4
20 4 55 - 2.6 4 36 - 3.7 3 53 - 6.1 3 30 - 7.5
PERIODIC COMET FAYE (1969a)
The following positions are from plates exposed by M. P. Candy,
Perth Observatory, using the 33-cm f/10 astrograph:
1970 UT R. A. (1950) Decl.
Jan. 29.62674 5 20 12.79 + 8 07 27.5
Feb. 10.59097 5 28 55.53 + 9 33 01.9
1970 May 6 (2240) Brian G. Marsden
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