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IAUC 5221: 1991k; H1413+117; 1991l

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IAUC number 

                                                  Circular No. 5221
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


PERIODIC COMET MRKOS (1991k)
     Ephemeris from the orbital elements on IAUC 5220:

     1991 ET      R.A. (1950) Decl.     Delta      r       m1
     Mar. 25    12 21.44    -11 35.2    0.423    1.415    13.6
          30    12 06.27    -16 51.0
     Apr.  4    11 51.37    -21 38.2    0.446    1.424    13.8
           9    11 37.48    -25 47.4
          14    11 25.18    -29 16.3    0.498    1.441    14.1
          19    11 14.92    -32 07.6
          24    11 06.90    -34 26.9    0.572    1.465    14.4
          29    11 01.13    -36 20.5
     May   4    10 57.52    -37 53.8    0.659    1.497    14.8
           9    10 55.93    -39 11.8
          14    10 56.20    -40 18.2    0.754    1.535    15.2
          19    10 58.14    -41 16.1
          24    11 01.59    -42 07.9    0.855    1.578    15.6

     Total visual magnitude estimate by A. Hale, Las Cruces, NM
(0.41-m reflector):  Mar. 21.41 UT, 13.8.  He notes that the comet
appears like a faint star with some diffuseness.


H1413+117
     P. O. Lindblad and M. Hjelm, Stockholm Observatory, report: "We
observed this object in the R band with the 2.5-m Nordic Optical
Telescope at La Palma on Feb. 11.3 and 12.3 UT.  On both occasions,
the brightness ratio of components B and A had a 'normal' value of
0.83, without any indication of increase between the two dates.
Thus, according to the observations by E. Giraud (cf. IAUC 5205),
component B has increased its brightness by almost a factor two in
six days."


COMET HELIN-LAWRENCE (1991l)
     Corrigendum.  R. H. McNaught reports that the p.a. for the tail
he reported on IAUC 5215 should read 350 deg.


1991 March 22                  (5221)             Daniel W. E. Green

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