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23 September 2008

P/Giacobini (205P)

111年ぶりに再発見されたP/Giacobini (205P)を捉えた様子です。

彗星の軌道要素などは以下です。
P/Giacobini (205P) mag 13.9
Period of orbit 6.66 years (2432.1 days)
Perihelion distance 1.5263810 AU
Aphelion distance 5.55 AU
Orbital elements:
Semimajor axis 3.5393111 AU
Eccentricity 0.5687350
Inclination of orbit 15.3066000 degrees
Argument of perihelion 154.2523000 degrees
Long. ascending node 179.6257000 degrees
Date of perihelion JD 2454719.58480 (10 Sep 2008 2:02:06)
Right ascension: 20h57m31.801s
Declination: -05 59' 21.85"
Mean position at current epoch:
Right ascension: 20h57m59.504s
Declination: -05 57' 19.40"
Apparent position at current epoch:
Right ascension: 20h58m01.138s
Declination: -05 57' 14.55"
Dist from home planet: 0.65272448 AU (97,646,193 km)
Heliocentric position: lon 342.64369 lat 4.57038
Heliocentric radius 1.53203 AU
94.15% illuminated
Phase angle: 27.99 degrees
Elongation from Sun 134.23 degrees (evening sky)
Speed of apparent motion: 1.375'/hour at position angle 130.1
Motion is -0.42 degrees/day in RA, -0.35 degrees/day in dec

撮影した時刻が、ちょうどGSC-2.3 SC1X000748
Right ascension: 20h57m31.48s +/- 0.37 arcsec
Declination: - 5 59' 37.1" +/- 0.35 arcsec
星の位置に極めて近く、画像処理で何とか分けてみることに成功した感じです。
自宅からはこのくらいの彗星がほぼ限界の暗さになりそうです。
Giacobini20080922captions
205pfindingchart





撮影データ
14:38:23、22, Sep., 2008(UT)
180sec.Exp X 4 frames
SMC PENTAX A*400mmF2.8+IDAS LPS-P2 Filter,
ORION StarShoot Pro Deep Space Color Imager
VIXEN SX赤道儀
FC-60+ORION StarShoot Auto-Guider camera controlled by PHDguiding
ステライメージV6+PhotoshopV5.0LE

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