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IAUC 5288: N Her 1991; 1990g; 1991X

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                                                  Circular No. 5288
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Telephone 617-495-7244/7440/7444 (for emergency use only)
TWX 710-320-6842 ASTROGRAM CAM     EASYLINK 62794505
MARSDEN or GREEN@CFA.BITNET    MARSDEN or GREEN@CFAPS2.SPAN


NOVA HERCULIS 1991
     D. Lynch, R. Russell, and J. Hackwell, Space and Environment
Technology Center, The Aerospace Corporation; and M. Hanner, Institute
for Astronomy, University of Hawaii, communicate:  "We obtained
medium-resolution [lambda/(Delta lambda) = 40-100] spectroscopy
between 3.5 and 13.5 microns using the Aerospace Corporation 116-
element spectrograph.  Observations were made on June 5.53 UT with a
3".3 aperture at the NASA Infrared Telescope Facility on Mauna Kea.
In addition to a blackbody-like spectrum between 3.0 and 5.5
microns, the spectrum showed a strong, structureless infrared excess
that peaks at about 10.7 microns (F = 3 x 10E-17 W cmE-2 micronE-1,
or narrowband N' = 1.3).  This emission feature is probably due to
recently formed dust.  Other infrared magnitudes were L = 6.0 and M
= 5.5."


COMET McNAUGHT-HUGHES (1990g)
     Ephemeris from orbital elements on MPC 18255:

     1991 ET      R.A. (1950) Decl.     Delta      r       m1
     June 13    12 25.86    +37 20.4    2.748    2.899    14.3
          23    12 16.00    +37 16.8
     July  3    12 09.76    +37 01.5    3.175    2.983    14.8
          13    12 06.43    +36 40.8
          23    12 05.41    +36 19.1    3.556    3.077    15.1
     Aug.  2    12 06.20    +35 59.3
          12    12 08.40    +35 43.5    3.859    3.181    15.5
          22    12 11.72    +35 33.6
     Sept. 1    12 15.87    +35 30.9    4.068    3.293    15.7

     Total visual magnitude estimates:  Mar. 15.50 UT, 13.4 (A.
Hale, Las Cruces, NM, 0.41-m reflector); Apr. 6.34, 13.5 (Hale);
11.35, 13.4 (R. J. Modic, Richmond Heights, OH, 0.40-m reflector);
23.35, 13.1 (Modic); May 12.34, 12.8 (C. S. Morris, Lockwood Valley,
CA, 0.51-m reflector); 19.41, 13.4 (Hale); June 2.26, 13.7 (Morris).


SUPERNOVA 1991X IN NGC 4902
     Visual magnitude estimates (cf. IAUC 5263):  May 12.52 UT, 14.1
(A. Pearce, Scarborough, W.A.); June 8.22, 14.5 (J. Mood, San Diego,
CA).


1991 June 13                   (5288)             Daniel W. E. Green

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