Circular No. 5790

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@CFA or GREEN@CFA (.SPAN, .BITNET or .HARVARD.EDU)

1993 HA_{2}

Ephemeris from the elements on IAUC 5789:

1993TT α_{2000} δ_{2000} Δ r ϵ β V
May 13 14^{h}05.^{m}05 −14^{o}01.^{′}3 11.675 12.638 161.^{o}6 1.^{o}4 20.5
23 14 02.96 −13 55.2 11.760 12.658 151.4 2.2 20.6
June 2 14 01.17 −13 50.5 11.870 12.679 141.4 2.9 20.7
12 13 59.76 −13 47.3 12.004 12.700 131.5 3.4 20.7
22 13 58.77 −13 46.2 12.156 12.720 121.7 3.9 20.8
July 2 13 58.24 −13 47.4 12.324 12.741 112.1 4.2 20.9

PERIODIC COMET SCHAUMASSE (1992x)

Extension to the ephemeris on IAUC 5713:

1993 TT α_{2000} δ_{2000} Δ r ϵ β m_{1}
May 3 10^{h}26.^{m}93 +31^{o}15.^{′}6 0.809 1.429 103.^{o}2 43.^{o}4 10.4
8 10 43.54 +28 30.9 0.856 1.463 103.1 42.2 10.6
13 10 58.79 +25 48.9 0.906 1.499 102.8 41.1 10.9
18 11 12.90 +23 11.2 0.961 1.535 102.2 40.1 11.2
23 11 26.04 +20 38.9 1.019 1.573 101.5 39.1 11.5
28 11 38.37 +18 12.7 1.082 1.612 100.6 38.2 11.8
June 2 11 50.01 +15 53.1 1.148 1.651  99.4 37.3 12.1
7 12 01.07 +13 40.0 1.217 1.691  98.2 36.4 12.4
12 12 11.63 +11 33.5 1.289 1.732  96.7 35.6 12.6
17 12 21.79 + 9 33.3 1.365 1.773  95.1 34.8 12.9
22 12 31.60 + 7 39.1 1.443 1.815  93.5 34.0 13.2
27 12 41.13 + 5 50.6 1.524 1.856  91.6 33.2 13.4
July 2 12 50.41 + 4 07.5 1.608 1.898  89.7 32.4 13.7
7 12 59.48 + 2 29.5 1.693 1.941  87.8 31.6 14.0
12 13 08.37 + 0 56.3 1.781 1.983  85.7 30.7 14.2
17 13 17.12 − 0 32.4 1.870 2.025  83.5 29.9 14.5
22 13 25.75 − 1 56.9 1.961 2.067  81.3 29.1 14.7
27 13 34.27 − 3 17.5 2.053 2.110  79.0 28.2 14.9
Aug. 1 13 42.71 − 4 34.3 2.146 2.152  76.7 27.3 15.2

Total visual magnitude estimates: Mar. 21.20 UT, 8.5 (C. S. Morris, Pine Mountain Club, CA, 20×80 binoculars); Apr. 10.16, 9.8 (A. Hale, Las Cruces, NM, 0.41-m reflector); 17.22, 9.6 (Morris).

1993 May 13 Daniel W. E. Green