Circular No. 7852

Central Bureau for Astronomical Telegrams INTERNATIONAL ASTRONOMICAL UNION

Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.

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COMET C/2002 E2 (SNYDER-MURAKAMI) Additional astrometry and the following preliminary parabolic orbital

elements appear on MPEC 2002-E43:

T = 2002 Feb. 22.890 TT  ω = 9.^{o}933
Ω = 244.743 }2000.0
q = 1.47019 AU  i = 92.840
2002 TT α_{2000}  δ_{2000}  Δ  r  ϵ  β  m_{1}
Mar. 7 18^{h}49.^{m}96 − 5^{o}06.^{′}4 1.605 1.480 64.^{o}5 37.^{o}2 10.2
9 18 52.29 − 3 16.1 1.580 1.484 65.9 37.7 10.2
11 18 54.57 − 1 22.1 1.555 1.488 67.3 38.0 10.2
13 18 56.80 + 0 35.6 1.531 1.492 68.7 38.4 10.2
15 18 58.99 + 2 37.1 1.509 1.498 70.1 38.6 10.1
17 19 01.12 + 4 42.2 1.487 1.503 71.4 38.9 10.1
19 19 03.19 + 6 51.0 1.467 1.509 72.8 39.0 10.1
21 19 05.21 + 9 03.2 1.449 1.516 74.1 39.2 10.1
23 19 07.18 +11 18.8 1.432 1.523 75.3 39.3 10.1
25 19 09.08 +13 37.4 1.417 1.531 76.5 39.3 10.1
27 19 10.92 +15 58.9 1.403 1.539 77.7 39.3 10.1

K. Hornoch, Lelekovice, Czech Republic, reports visual m_{1} = 10.1 and coma diameter 3′.1 on Mar. 13.12 UT (0.13-m reflector).

COMET C/2002 C1 (IKEYA-ZHANG)

Ephemeris from orbital elements on MPEC 2002-E22:

2002 TT α_{2000} δ_{2000} Δ r ϵ β m_{1}
Mar. 7 1^{h}13.^{m}10 + 5^{o}40.^{′}8 1.053 0.581 32.^{o}9 67.^{o}8 4.8
9 1 16.57 + 7 44.1 1.015 0.560 32.4  71.7 4.5
11 1 19.70 + 9 53.4 0.975 0.542 31.9  75.9 4.3
13 1 22.41 +12 08.5 0.936 0.527 31.5  80.3 4.1
15 1 24.56 +14 29.2 0.896 0.516 31.1  85.0 3.9
17 1 26.05 +16 55.2 0.856 0.509 30.8  89.8 3.7
19 1 26.77 +19 25.9 0.817 0.507 30.5  94.6 3.6
21 1 26.59 +22 00.5 0.779 0.509 30.3  99.1 3.5
23 1 25.43 +24 38.3 0.742 0.516 30.3 103.2 3.5
25 1 23.20 +27 18.5 0.707 0.527 30.4 106.9 3.5
27 1 19.83 +30 00.3 0.674 0.542 30.7 109.8 3.5

2002 March 13  \begin{matrix}c \\ ◯ \end{matrix} Copyright 2002 CBAT  Daniel W. E. Green