Vizuális felfedezés bizony! Donald Machholz egy 47 cm-es reflektorral,
vizuálisan 607 óra keresés után! Sajnos nem lesz könnyen megfigyelhetõ.
Sry
Circular No. 9132
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
CBAT Director: D. W. E. Green, Room 209; Department of
Earth and Planetary Sciences; Harvard University;
20 Oxford St.; Cambridge, MA 02138; U.S.A.
CBAT@IAU.ORG; CBATIAU@EPS.HARVARD.EDU
URL
http://www.cfa.harvard.edu/iau/cbat.html ISSN 0081-0304
COMET C/2010 F4 (MACHHOLZ)
Don Machholz reports his visual discovery of a diffuse comet
with coma diameter about 2´ (DC = 2), using a 0.47-m f/4.8
reflector (77x) at his home in Colfax, CA, U.S.A., in the course of
his comet-hunting program on Mar. 23, as tabulated below; no motion
was detected in 20 minutes due to encroaching twilight. Machholz
found the comet again of similar appearance (the magnitude then
given as 11.5-12) on the morning of Mar. 26, indicating that it is
moving rapidly towards the sun. Machholz had searched for 607
hours since his previous find on 2004 Aug. 27 (cf. IAUCs 8394,
8395). After posting on the Minor Planet Center´s ´NEOCP´ webpage,
three Japanese amateurs have reported confirmation of the new comet.
Y. Ikari (Moriyama, Shiga-ken, 0.26-m reflector + CCD) reports a
coma diameter of 0´.5. K. Kadota (Ageo, Saitama-ken, 0.25-m
reflector + CCD) finds that his images taken through clouds show
the object to be diffuse (coma diameter 1´.5) with central
condensation and no tail. K. Yoshimoto (Yamaguchi-ken, 0.25-m
reflector) reports that a visual observation yields total mag 11.0
and coma diameter 1´.3 (DC = 3) on Mar. 26.830 UT.
2010 UT R.A. (2000) Decl. Mag. Observer
Mar. 23.526 22 54.2 +31 22 11 Machholz
26.515 23 23.5 +32 14 12 "
26.80750 23 25 47.20 +32 13 14.8 13.9 Ikari
26.81116 23 25 49.37 +32 13 16.8 "
26.81482 23 25 51.44 +32 13 19.0 "
26.82056 23 25 54.80 +32 13 22.6 "
26.82158 23 25 55.40 +32 13 23.3 12.3 Kadota
26.82296 23 25 56.18 +32 13 23.6 "
26.82734 23 25 58.73 +32 13 26.3 14.7 Ikari
The following parabolic orbital elements are extremely uncertain:
T = 2010 Apr. 10.669 TT, q = 0.58698 AU, Peri. = 135.062, Node =
245.662, i = 86.831 (equinox 2000.0). Ephemeris using H_(7.5) =
12.0:
2010 TT R. A. (2000) Decl. Delta r Elong. Phase Mag.
Mar. 25 23 08.35 +31 50.0 1.237 0.693 34.1 53.7 11.3
26 23 17.99 +32 04.4 1.241 0.682 33.3 53.4 11.2
27 23 27.63 +32 15.1 1.246 0.671 32.5 53.0 11.2
28 23 37.26 +32 22.1 1.251 0.661 31.7 52.5 11.1
29 23 46.84 +32 25.3 1.258 0.651 30.9 51.9 11.1
30 23 56.35 +32 24.8 1.266 0.642 30.1 51.3 11.1
31 00 05.76 +32 20.6 1.274 0.633 29.3 50.5 11.0
(C) Copyright 2010 CBAT
2010 March 26 (9132) Daniel W. E. Green