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IAUC 3474: 1980c; Sats OF SATURN; Prob. Occn BY 1978 P 1

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IAUC number

                                                  Circular No. 3474
Central Bureau for Astronomical Telegrams
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

     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.

     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).

     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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