Central Bureau for Astronomical Telegrams
IAUC 3474: 1980c; Sats OF SATURN; Prob. Occn BY 1978 P 1
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Read IAUC 3475
Circular No. 3474
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 617-864-5758
PERIODIC COMET HONDA-MRKOS-PAJDUSAKOVA (1980c)
P. M. Millman, Herzberg Institute of Astrophysics, reports
that this comet was independently recovered by I. Halliday with the
Canada-France-Hawaii 3.6-m telescope at Mauna Kea as follows:
1980 UT R. A. (1950) Decl. m1
May 7.2500 5 08 03 +16 16.6 14
A 10-min exposure (098-02 emulsion, RG 630 filter) shows a very
faint tail ~ 40" long centered on p.a. 70o; two faint streamers
9" long appear in p.a. 30o and 60o.
SATELLITES OF SATURN
A. Dollfus, Observatoire de Meudon, telexes that a survey for
satellites was conducted at Pic du Midi by S. Brunier and himself
during Mar. 20-24; 150 exposures covering 17 hours were obtained.
1966 S 2, with period 0.69468 day (cf. IAUC 3463), which is in
accord with a reanalysis of most of the observations originally
attributed to Saturn X (Janus), was observed on 13 exposures between
Mar. 23.886 and 23.990 UT with maximum eastern elongation on Mar.
23.925 +/- 0.002; mag ~ 14. Another satellite, designated 1980 S 19,
mag ~ 15, was simultaneously seen detached from the ring, with
maximum western elongation on Mar. 23.882 +/- 0.005 at 2.55 Rs (Saturn
equatorial radii) from Saturn; a period of 0.712 day fits with 1980
S 3, S 4 and S 5. Another faint object, 1980 S 20, was seen on six
exposures between Mar. 20.899 (1.9 Rs east) and 20.922 (2.20 RS
east). A dubious object, 1980 S 21, was suspected on four exposures
around Mar. 22.98 at 2.2 Rs west. Another dubious object,
1980 S 22, fainter than mag 16, was suggested on four exposures
between Mar. 20.885 (5.89 Rs west) and 20.978 (5.25 Rs west).
PROBABLE OCCULTATION BY 1978 P 1
R. S. Harrington, U.S. Naval Observatory, writes that analysis
of exposures on Apr. 13 and 20 by C. C. Dahn and J. W. Christy with
the 1.5-m reflector and 0.2-m astrograph indicates that at the time
of the observed occultation associated with Pluto on Apr. 6 (cf
IAUC 3466) the star was ~ 0".5 west and 0".9 north of Pluto. 1978 P 1
was predicted to be 0".1 west and 0".9 north, supporting the
conclusion that the occultation was caused by the satellite.
1980 May 9 (3474) Brian G. Marsden
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