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IAUC 3968: N Vul 1984; 1984 N1; STRONG HYDROGEN EMISSION FROM ARP 220 AND NGC 6240

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IAUC number 

                                                  Circular No. 3968
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 617-495-7244/7440/7444


NOVA VULPECULAE 1984
     The following precise position has been measured by H. Kosai,
Tokyo Observatory, from a film taken by M. Huruhata at Gotenba,
Shizuoka, on July 29.5 UT: R.A. = 19h24m03s46, Decl. = +27deg15'54"4
(equinox 1950.0).  Further visual magnitude estimates, in part provided
by J. Mattei, AAVSO: Aug. 1.10 UT, 7.9 (J. Bortle, Stormville, NY);
1.29, 7.9 (C. Scovil, Stamford, CT); 1.43, 7.8 (C. S. Morris,
Whitaker Peak, CA); 2.12, 6.6 (D. Weier, Madison, WI).


1984 N1
     With further reference to the note on IAUC 3962, R. Hafner
and J. Manfroid report that the combination of I-band and K-band
high-speed photometry indicates that the occultation was due to a
body with a minimum size of 10-15 km.  The shape of the lightcurves
suggests that the apparent diameters of the star and the
occulting body were of the same order.  No catalogued minor planet
was in the area, and Schmidt plates did not show any unknown
objects down to mag 17.  At the time the satellites Triton and
Nereid were not close to the line of sight, and it is suggested
that the occulting body belongs to the Neptunian system and is
orbiting the planet at a distance of about 3 radii.  There is in
fact a remarkable similarity to the event recorded by Reitsema et
al. in 1981 (cf. IAUC 3608).  It seems probable that many bodies
share the same orbit, although it cannot be completely excluded
that the occultation was caused by part of an irregular ring.


STRONG HYDROGEN EMISSION FROM ARP 220 AND NGC 6240
     E. Becklin, J. Black, R. Cutri, D. DePoy, R. Elston, C.
Impey, R. Joseph, W. Kailey, M. Lebofsky, C. McAlary, G. Rieke, C.
Seab, R. Wade, M. Werner, G. Wright and C. Wynn-Williams report:
"Independent observations with the MMT and the U.K. Infrared
Telescope led us to the discovery of exceedingly strong molecular
hydrogen emission from the disturbed galaxies Arp 220 and NGC 6240.
Arp 220 emits 10**7 LO in the H2 (1-0) S(1) line alone; NGC 6240 is
ten times more luminous still.  The most likely explanation for
the observations is shock excitation in collisions of the
interstellar clouds of two interacting galaxies."


1984 August 3                  (3968)              Brian G. Marsden

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