Circular No. 8885

Central Bureau for Astronomical Telegrams INTERNATIONAL ASTRONOMICAL UNION

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

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COMET P/2007 U2 (LINEAR-NEAT) K. Sárneczky and L. L. Kiss report their recovery of comet P/2001 Q5

(cf. IAUC 7697) on R-band CCD images obtained with the 2.3-m reflector at Siding Spring (astrometry tabulated below). Coma diameters and tail lengths: Oct. 21.5 UT, 3′′, 6′′ in p.a. 95^{o} (co-added 300-s image); 22.4, 3′′, 8′′ in p.a. 90^{o} (co-added 180-s image).

2007 UT  α_{2000}  δ_{2000}  Mag.
Oct. 21.44897  18^{h}34^{m}35.^{s}78  −28^{o}52′24′′.9  19.8
21.45048  18 34 35.98  −28 52 23.9
21.45199  18 34 36.14  −28 52 23.5
21.45350  18 34 36.29  −28 52 22.9
22.39249  18 36 15.32  −28 46 59.9
22.40073  18 36 16.17  −28 46 57.2  19.7
22.40629  18 36 16.77  −28 46 55.3
22.41352  18 36 17.49  −28 46 52.5
22.41704  18 36 17.89  −28 46 51.4

The indicated correction to the prediction on MPC 54167 is ΔT = −0.5 day. The following orbital elements by B. G. Marsden are from 234 observations, 2001–2007 (mean residual 0′′.7); the ephemeris uses H_{10} = 14.0.

Epoch = 2001 June 20.0 TT

T = 2001 June 11.6210 TT  ω = 6.^{o}3996
e = 0.416559  Ω = 336.2663 }2000.0
q = 2.043148 AU  i = 10.9448

a = 3.501896 AU n^{o} = 0.1504005 P = 6.553 years Epoch = 2008 Feb. 24.0 TT

T = 2008 Feb. 20.4955 TT  ω = 8.^{o}2860
e = 0.395943  Ω = 335.2570 }2000.0
q = 2.155746 AU  i = 10.7041

a = 3.568779 AU n^{o} = 0.1461923 P = 6.742 years

2007TT α_{2000}  δ_{2000}  Δ  r  ϵ  β  Mag.
Oct. 17 18^{h}26.^{m}93 −29^{o}17.^{′}3 2.433 2.342 72.^{o}9 24.^{o}0 19.6
27 18 44.50 −28 19.9 2.518 2.316 66.8 23.2 19.7
Nov. 6 19 03.13 −27 16.2 2.600 2.291 61.1 22.3 19.7
16 19 22.62 −26 04.8 2.677 2.268 55.5 21.1 19.7
26 19 42.75 −24 44.7 2.748 2.246 50.1 19.7 19.7
2007 October 22  \begin{matrix}c \\ ◯ \end{matrix} Copyright 2007 CBAT  Daniel W. E. Green