Comet Archive

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C/2007 B2 (Skiff)

メタデータ

項目 値
Designation C/2007 B2 (Skiff)
Type C
Perihelion (tp_cal, UTC) 2008-08-20T20:11:20.682240Z
Orbit solution date (soln_date, UTC) 2021-04-15T23:31:03Z
Obs used 1527
NEO -
M1 9.200
K1 7.250
PC -
オスキュレーティング軌道要素
項目 値
Epoch (epoch_cal, TDB) 2008-03-08.0000000
e 0.99596321
q (au) 2.974916
a (au) 736.951176
i (deg) 27.495297
Ω (om, deg) 14.868892
ω (w, deg) 205.997314
M (ma, deg) 359.991830

等級

C/2007 B2 (Skiff) · Magnitude (Full range)

散乱 + 全体線形

$$ M_a = (12.353 + 2.105\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$

モデル定数

項目 値
H0 12.353
n 2.105
gf 1.000
gb -0.636
k 0.800
δ90 10.000
パラメータ 記号 範囲 説明
太陽・地球距離が1 AUのときの絶対等級 H0 -5 to 20 彗星の固有の明るさ
測光スロープパラメータ n 2 to 6 太陽距離に対する明るさ変化率
前方散乱非対称係数 gf 0.8 to 1 前方散乱の強さ
後方散乱非対称係数 gb -1 to -0.5 後方散乱の強さ
分配係数 k 0.8 to 1 前方/後方散乱の寄与比
ダスト/ガス明るさ比 δ90 1 to 10 ダスト散乱とガス放射の相対寄与

参考: EPSC-DPS2025-160

天体暦

Date/Time (UTC) RA (J2000) Dec (J2000) Nearest HIP Dist from HIP (arcmin)
2026-02-03 00:00 00:30:42.96 -00:19:02.4 HIP 2333 13.01
2026-02-03 12:00 00:30:44.92 -00:18:45.5 HIP 2333 13.51
2026-02-04 00:00 00:30:46.90 -00:18:28.5 HIP 2333 14.01
2026-02-04 12:00 00:30:48.90 -00:18:11.3 HIP 2333 14.53
2026-02-05 00:00 00:30:50.92 -00:17:54.0 HIP 2333 15.06
2026-02-05 12:00 00:30:52.96 -00:17:36.7 HIP 2333 15.59
2026-02-06 00:00 00:30:55.02 -00:17:19.2 HIP 2333 16.14
2026-02-06 12:00 00:30:57.10 -00:17:01.6 HIP 2333 16.69
2026-02-07 00:00 00:30:59.20 -00:16:43.9 HIP 2333 17.25
2026-02-07 12:00 00:31:01.32 -00:16:26.0 HIP 2333 17.82
2026-02-08 00:00 00:31:03.45 -00:16:08.1 HIP 2333 18.40
2026-02-08 12:00 00:31:05.61 -00:15:50.1 HIP 2333 18.98
2026-02-09 00:00 00:31:07.79 -00:15:31.9 HIP 2333 19.57
2026-02-09 12:00 00:31:09.99 -00:15:13.7 HIP 2333 20.17
2026-02-10 00:00 00:31:12.21 -00:14:55.3 HIP 2333 20.77
2026-02-10 12:00 00:31:14.44 -00:14:36.9 HIP 2333 21.39
2026-02-11 00:00 00:31:16.70 -00:14:18.3 HIP 2333 22.00
2026-02-11 12:00 00:31:18.97 -00:13:59.7 HIP 2333 22.63
2026-02-12 00:00 00:31:21.27 -00:13:40.9 HIP 2333 23.26
2026-02-12 12:00 00:31:23.58 -00:13:22.1 HIP 2333 23.90
2026-02-13 00:00 00:31:25.91 -00:13:03.2 HIP 2333 24.54
2026-02-13 12:00 00:31:28.25 -00:12:44.1 HIP 2585 24.68
2026-02-14 00:00 00:31:30.62 -00:12:25.0 HIP 2585 24.38
2026-02-14 12:00 00:31:33.00 -00:12:05.8 HIP 2585 24.09
2026-02-15 00:00 00:31:35.40 -00:11:46.5 HIP 2585 23.82
2026-02-15 12:00 00:31:37.82 -00:11:27.1 HIP 2585 23.56
2026-02-16 00:00 00:31:40.25 -00:11:07.6 HIP 2585 23.32
2026-02-16 12:00 00:31:42.70 -00:10:48.0 HIP 2585 23.09
2026-02-17 00:00 00:31:45.17 -00:10:28.4 HIP 2585 22.88
2026-02-17 12:00 00:31:47.65 -00:10:08.6 HIP 2585 22.69
2026-02-18 00:00 00:31:50.15 -00:09:48.8 HIP 2585 22.51
2026-02-18 12:00 00:31:52.67 -00:09:28.9 HIP 2585 22.36
2026-02-19 00:00 00:31:55.20 -00:09:08.9 HIP 2585 22.22
2026-02-19 12:00 00:31:57.75 -00:08:48.9 HIP 2585 22.11
2026-02-20 00:00 00:32:00.32 -00:08:28.7 HIP 2585 22.02
2026-02-20 12:00 00:32:02.90 -00:08:08.5 HIP 2585 21.95
2026-02-21 00:00 00:32:05.49 -00:07:48.2 HIP 2585 21.90
2026-02-21 12:00 00:32:08.10 -00:07:27.9 HIP 2585 21.88
2026-02-22 00:00 00:32:10.73 -00:07:07.4 HIP 2585 21.88
2026-02-22 12:00 00:32:13.37 -00:06:46.9 HIP 2585 21.91
2026-02-23 00:00 00:32:16.02 -00:06:26.4 HIP 2585 21.96
2026-02-23 12:00 00:32:18.69 -00:06:05.7 HIP 2585 22.04
2026-02-24 00:00 00:32:21.37 -00:05:45.0 HIP 2585 22.14