Comet Archive

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C/2015 J2 (PANSTARRS)

メタデータ

項目 値
Designation C/2015 J2 (PANSTARRS)
Type C
Perihelion (tp_cal, UTC) 2015-09-08T21:55:57.529920Z
Orbit solution date (soln_date, UTC) 2021-04-15T23:33:10Z
Obs used 99
NEO -
M1 7.200
K1 14.500
PC 0.030
オスキュレーティング軌道要素
項目 値
Epoch (epoch_cal, TDB) 2015-07-15.0000000
e 0.98250509
q (au) 4.320386
a (au) 246.951051
i (deg) 17.281830
Ω (om, deg) 56.755871
ω (w, deg) 203.688946
M (ma, deg) 359.985799

等級

C/2015 J2 (PANSTARRS) · Magnitude (Full range)

散乱 + 全体線形

$$ M_a = (16.150 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$

モデル定数

項目 値
H0 16.150
n 2.000
gf 1.000
gb -0.722
k 0.800
δ90 9.998
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 01:57:37.64 +03:55:19.7 HIP 9156 4.62
2026-02-03 12:00 01:57:39.23 +03:55:41.9 HIP 9156 4.20
2026-02-04 00:00 01:57:40.87 +03:56:04.2 HIP 9156 3.79
2026-02-04 12:00 01:57:42.54 +03:56:26.7 HIP 9156 3.42
2026-02-05 00:00 01:57:44.25 +03:56:49.5 HIP 9156 3.10
2026-02-05 12:00 01:57:46.00 +03:57:12.3 HIP 9156 2.85
2026-02-06 00:00 01:57:47.79 +03:57:35.4 HIP 9156 2.70
2026-02-06 12:00 01:57:49.62 +03:57:58.7 HIP 9156 2.67
2026-02-07 00:00 01:57:51.49 +03:58:22.1 HIP 9156 2.77
2026-02-07 12:00 01:57:53.40 +03:58:45.7 HIP 9156 3.00
2026-02-08 00:00 01:57:55.34 +03:59:09.5 HIP 9156 3.32
2026-02-08 12:00 01:57:57.33 +03:59:33.4 HIP 9156 3.73
2026-02-09 00:00 01:57:59.35 +03:59:57.5 HIP 9156 4.20
2026-02-09 12:00 01:58:01.42 +04:00:21.8 HIP 9156 4.72
2026-02-10 00:00 01:58:03.52 +04:00:46.3 HIP 9156 5.27
2026-02-10 12:00 01:58:05.65 +04:01:10.9 HIP 9156 5.86
2026-02-11 00:00 01:58:07.83 +04:01:35.7 HIP 9156 6.46
2026-02-11 12:00 01:58:10.04 +04:02:00.6 HIP 9156 7.09
2026-02-12 00:00 01:58:12.29 +04:02:25.7 HIP 9156 7.74
2026-02-12 12:00 01:58:14.58 +04:02:51.0 HIP 9156 8.40
2026-02-13 00:00 01:58:16.91 +04:03:16.4 HIP 9156 9.07
2026-02-13 12:00 01:58:19.27 +04:03:42.0 HIP 9156 9.76
2026-02-14 00:00 01:58:21.67 +04:04:07.7 HIP 9156 10.47
2026-02-14 12:00 01:58:24.11 +04:04:33.6 HIP 9156 11.18
2026-02-15 00:00 01:58:26.58 +04:04:59.6 HIP 9156 11.91
2026-02-15 12:00 01:58:29.09 +04:05:25.8 HIP 9156 12.65
2026-02-16 00:00 01:58:31.64 +04:05:52.2 HIP 9156 13.39
2026-02-16 12:00 01:58:34.22 +04:06:18.6 HIP 9156 14.15
2026-02-17 00:00 01:58:36.83 +04:06:45.3 HIP 9156 14.92
2026-02-17 12:00 01:58:39.49 +04:07:12.0 HIP 9156 15.70
2026-02-18 00:00 01:58:42.18 +04:07:38.9 HIP 9156 16.49
2026-02-18 12:00 01:58:44.90 +04:08:06.0 HIP 9156 17.28
2026-02-19 00:00 01:58:47.66 +04:08:33.2 HIP 9156 18.09
2026-02-19 12:00 01:58:50.45 +04:09:00.5 HIP 9156 18.91
2026-02-20 00:00 01:58:53.28 +04:09:27.9 HIP 9156 19.73
2026-02-20 12:00 01:58:56.14 +04:09:55.5 HIP 9156 20.57
2026-02-21 00:00 01:58:59.03 +04:10:23.2 HIP 9156 21.41
2026-02-21 12:00 01:59:01.96 +04:10:51.0 HIP 9156 22.26
2026-02-22 00:00 01:59:04.93 +04:11:19.0 HIP 9368 22.64
2026-02-22 12:00 01:59:07.92 +04:11:47.1 HIP 9368 21.76
2026-02-23 00:00 01:59:10.95 +04:12:15.3 HIP 9368 20.87
2026-02-23 12:00 01:59:14.01 +04:12:43.6 HIP 9368 19.97
2026-02-24 00:00 01:59:17.11 +04:13:12.0 HIP 9368 19.06