Central Bureau for Astronomical Telegrams
IAUC 3074: MASER TURN-ON OF W3(OH); Poss. SN IN NGC 4278; P/WOLF-HARRINGTON; ECLIPSES OF SATURN VIII (IAPETUS)
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Circular No. 3074
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 Telex: 921428
Telephone: (617) 864-5758
MASER TURN-ON OF W3(OH)
B. Burke, Massachusetts Institute of Technology, reports that
observations by A. D. Haschick at the Haystack Observatory show the
amplitude of the -50.4 km/s line of the H2O maser complex in W3(OH)
(R.A. = 2h23m.3, Decl. = +61o39', equinox 1950.0) to be increasing by 10
percent per day (since May 8).
POSSIBLE SUPERNOVA IN NGC 4278
V. C. Rubin, Department of Terrestrial Magnetism, informs us
that inspection of very short exposures of NGC 4278, taken by E.
Hubble with the 254-cm reflector in 1923, shows a faint star some
12" north of the nucleus that is probably identical with the
'possible supernova' reported on IAUC 3043. It seems likely that the
television mode of observation caused the current brightness to be
somewhat overestimated. Other astronomers have reported failure to
detect in March, either visually or photographically, any object
brighter than magnitude ~ 15 at the indicated position.
PERIODIC COMET WOLF-HARRINGTON
The following prediction, by B. G. Marsden, is based on observations
at the four returns 1951-1972. Perturbations by all nine
planets and nongravitational effects were taken into account.
T = 1978 Mar. 15.8976 ET Epoch = 1978 Apr. 2.0 ET
Peri. = 186.9817 e = 0.538013
Node = 254.2133 1950.0 a = 3.494872 AU
Incl. = 18.4588 n = 0.1508541
q = 1.614585 AU P = 6.534 years
For dT = +1d
1977/78 ET R. A. (1950) Decl. Delta r dR.A. dDecl. m2
June 6 23 15.41 +15 00.1 2.923 2.914 -0m80 - 4'4 20.5
16 23 23.87 +16 56.8 -0.88 - 4.7
26 23 31.34 +18 54.2 2.565 2.800 -0.97 - 5.1 20.0
July 6 23 37.62 +20 51.0 -1.07 - 5.5
16 23 42.43 +22 45.3 2.219 2.684 -1.19 - 6.0 19.5
26 23 45.48 +24 34.5 -1.32 - 6.7
Aug. 5 23 46.48 +26 15.1 1.901 2.567 -1.46 - 7.5 19.0
15 23 45.13 +27 42.2 -1.60 - 8.5
25 23 41.29 +28 49.5 1.630 2.450 -1.74 - 9.7 18.5
Sept. 4 23 35.06 +29 29.9 -1.85 -11.1
14 23 26.91 +29 36.1 1.426 2.333 -1.92 -12.5 17.9
24 23 17.78 +29 03.4 -1.94 -13.7
Oct. 4 23 08.99 +27 51.9 1.303 2.217 -1.91 -14.6 17.5
14 23 01.91 +26 07.5 -1.83 -14.7
24 22 57.73 +24 01.4 1.266 2.104 -1.75 -14.3 17.2
Nov. 3 22 57.18 +21 47.4 -1.66 -13.3
13 23 00.51 +19 38.0 1.297 1.996 -1.59 -11.9 17.1
23 23 07.68 +17 43.2 -1.54 -10.3
Dec. 3 23 18.38 +16 08.8 1.373 1.896 -1.51 - 8.8 17.0
13 23 32.22 +14 57.4 -1.51 - 7.3
23 23 48.83 +14 09.1 1.472 1.805 -1.52 - 6.0 16.9
Jan. 2 0 07.82 +13 42.4 -1.54 - 4.7
12 0 28.88 +13 34.5 1.582 1.729 -1.58 - 3.6 16.9
22 0 51.72 +13 42.1 -1.62 - 2.6
Feb. 1 1 16.09 +14 01.3 1.695 1.669 -1.65 - 1.6 16.9
11 1 41.79 +14 28.2 -1.69 - 0.6
21 2 08.61 +14 58.9 1.811 1.630 -1.72 + 0.3 16.9
Mar. 3 2 36.34 +15 29.4 -1.74 + 1.3
13 3 04.81 +15 56.2 1.932 1.615 -1.75 + 2.3 17.0
23 3 33.83 +16 16.1 -1.74 + 3.2
Apr. 2 4 03.16 +16 26.4 2.062 1.623 -1.73 + 4.2 17.2
12 4 32.63 +16 24.9 -1.70 + 5.0
22 5 02.00 +16 10.4 2.202 1.656 -1.65 + 5.8 17.4
May 2 5 31.08 +15 41.9 -1.59 + 6.5
12 5 59.70 +14 59.5 2.353 1.710 -1.53 + 7.1 17.7
22 6 27.69 +14 03.4 -1.46 + 7.5
June 1 6 54.93 +12 54.6 2.514 1.782 -1.38 + 7.8 18.0
m2 = 13.5 + 5 log Delta + 10 log r
ECLIPSES OF SATURN VIII (IAPETUS)
A. W. Harris, Jet Propulsion Laboratory, provides the following
predictions for the eclipses of Iapetus by Saturn and its rings
on 1977 Oct. 19-20 and 1978 Jan. 7-8. The earlier predictions
(Peters 1975, Celes. Mech. 12, 99; Porter 1976, Handb. Br. Astron.
Assoc. for 1977, p. 63) have been substantially revised with the
help of the new theory for Iapetus by A. T. Sinclair, H.M. Nautical
Almanac Office. The times are still uncertain by about +/- 15 min.
Event 1977 ET 1978 ET
Immersion, A ring shadow Oct. 19d12h25m
Emersion, A ring shadow 19 13 55
Immersion, B ring shadow 19 14 25
Immersion, C ring shadow 19 17 31
Disappearance, Planet shadow 19 19 31 Jan. 7d18h57m
Reappearance, Planet shadow 20 05 07 8 04 12
Emersion, B ring shadow 8 08 04
Immersion, A ring shadow 8 08 49
Emersion, A ring shadow 20 05 11 8 10 48
1977 May 16 (3074) Brian G. Marsden
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