THE ASTRONOMER Electronic Circular No 789       1993 Nov 16 20.55UT
Ed:Guy M Hurst, 16,Westminster Close, Kempshott Rise,  Basingstoke,
Hants, RG22 4PP,England. Telephone/FAX(0256)471074 Int:+44256471074
TELEX: 9312111261 Answerback: TA G      TELECOM GOLD: 10074:MIK2885
GMH at UK.AC.RUTHERFORD.STARLINK.ASTROPHYSICS  STARLINK: RLSAC::GMH
GMH at UK.AC.CAM.ASTRONOMY.STARLINK            STARLINK: CAVAD::GMH
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OCCULTATION OF SAO 158379 BY JUPITER
Marcel Wilmet, Mariembourg, Belgium faxes:

This event will take place on 1993 November 29 (morning) and the
visibility area should include North-West Europe (twilight),
North-West Africa, the Canary Islands (twilight) and North-West
Brazil.

The following information has been made available from IOTA:

SAO 158379 = HD 123523 = Hipparcos Input Catalogue star 69092.

RA 14h05m48.0s DEC -11 35'34" [1950]
   14 08 29.0      -11 49 46  [2000]

Spectral type: A2 (white star) Magnitudes: V=6.8; B=7.0.

Apparent diameter: 1.6 10-4 arc sec i.e. 740 metres at the distance
of Jupiter.

Relative Velocity (geocentric): 37 km/s

Closest approach  (geocentric) to Jupiter's centre: 4.7" NNE

At:                                                 6h48m54sUT

Occultation duration (geocentric): 3700 seconds

Notes: This stellar occultation by Jupiter will begin during the
totality of the next total eclipse of the Moon!

The disappearance and reappearance phenomena will be progressive,
because of the refraction of the stellar light in the
'thermosphere' of Jupiter, within the rarefied hydrogen-helium gas,
300km above ammonia clouds. Strong chromatic scintillation of the
star is expected, due to Jovian atmospheric turbulence along the
ray path.

Editor: The BAA Handbook [1993] quotes immersion at 6h19mUT and
emersion as 7h19mUT for a geocentric observer. At Greenwich
immersion occurs at an altitude of 140, while emersion takes place
during morning civil twilight. The elongation from the Sun will be
33 degrees.