> Riadó!
>
> Minden bizonnyal egy új üstököst fedeztek fel néhány órával ezelőtt japán
> amatőrök az esti égen, de még nincs hivatalos közlemény. Alább az esti
> koordináták óránkánt UT-ben. A 14,5 magnitúdó minden bizonnyal CCD-s
> fényesség, ami akár 11-12 magnitúdós vizuális fényességet is jelenthet.
>
> dátum UT RA D E V "/perc PA
> 2008 09 10 18 20 39 32.8 -01 22 02 140.6 14.5 1.31 142.1
> 2008 09 10 19 20 39 36.0 -01 23 04 140.6 14.5 1.31 142.1
> 2008 09 10 20 20 39 39.2 -01 24 06 140.6 14.5 1.31 142.1
> 2008 09 10 21 20 39 42.4 -01 25 08 140.5 14.5 1.31 142.0
> 2008 09 10 22 20 39 45.7 -01 26 10 140.5 14.5 1.31 142.0
> 2008 09 10 23 20 39 48.9 -01 27 11 140.5 14.5 1.31 141.9
> 2008 09 11 00 20 39 52.1 -01 28 13 140.5 14.5 1.31 141.9
>
> Sry
>
Azóta kijött az IAU Cirkusz. Ez a D/1896 R2 (Giacobini). Akkor pár
hónapig, 1897 elejéig követték. 6.66 év periódusú kométa, valószínű a
pályaváltozások és az alacsony aktivitás miatt nem látták 111 évig. Most
13.5-ös mérések jöttek róla, vizuálisan 11-12m lehet.
COMET P/2008 R6 (GIACOBINI)
S. Nakano, Sumoto, Japan, reports the discovery of a comet by
Koichi Itagaki (Teppo-cho, Yamagata) and Hiroshi Kaneda (Minami-ku,
Sapporo) on unfiltered CCD patrol frames taken on Sept. 10.56 UT
using a 0.21-m f/3 reflector; the position tabulated below was
measured from a confirming unfiltered CCD image taken subsequently
with a 0.60-m f/5.7 reflector at Yamagata, noting that the comet is
diffuse with strong condensation, with a coma diameter of about 25"
and a 2´ tail toward the east-southeast.
2008 UT R.A. (2000) Decl. Mag.
Sept.10.56854 20 39 18.70 - 1 17 39.9 13.5
Following posting on the Minor Planet Center´s ´NEOCP´ webpage,
numerous other CCD astrometrists have noted the cometary
appearance of this object (some of the reports being sent by Nakano),
with the coma diameter generally given as 20"-50" and the tail
length given as 20"-66" in p.a. about 106-124 deg (such reports
have been received from Y. Ikari, Moriyama, Shiga-ken, Japan; K.
Kadota, Ageo, Saitama-ken, Japan; V. Gonano and E. Guido,
Remanzacco, Italy; R. Ligustri, Talmassons, Udine, Italy; J. J.
Gomez, Gandia, Spain; J. A. Henriquez, Tenerife, Spain; P.
Camilleri and G. Sostero, remotely using a 0.30-m reflector at
Catania, Italy; and F. Castellani, Monte Baldo, Italy).
M. Meyer, Limburg, Germany, suggests that this comet is
identical to comet D/1896 R2 (Giacobini), which has not been seen
since Jan. 1897 and for which a prediction by Nakano (2005, Nakano
Note 1211, based on an orbit by Belyaev et al. 1974, QJRAS 15, 450)
gives T = 2008 Sept. 9.89 TT. The identity has been confirmed by
Nakano, who notes that the comet has made 17 revolutions and passed
only 0.51 AU from the earth on 1962 Sept. 9 and 0.81 AU from
Jupiter on 1992 Jan. 14. The following linked orbital elements by
B. G. Marsden are from 93 observations, 1896-2008 (including newly
reduced astrometry by G. V. Williams from 1896-1897); these
elements, together with the 1896 elements and an ephemeris, appear
on MPEC 2008-R60.
Epoch = 2008 Sept.11.0 TT
T = 2008 Sept.10.2063 TT Peri. = 154.3051
e = 0.568403 Node = 179.6275 2000.0
q = 1.527870 AU Incl. = 15.3177
a = 3.540037 AU n = 0.1479764 P = 6.66 years
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