Comet Archive

Clear skies!

C/1983 O2 (IRAS)

メタデータ

項目 値
Designation C/1983 O2 (IRAS)
Type C
Perihelion (tp_cal, UTC) 1983-11-28T00:05:51.535680Z
Orbit solution date (soln_date, UTC) 2021-04-15T23:29:31Z
Obs used 35
NEO -
M1 9.400
K1 10.750
PC 0.030
オスキュレーティング軌道要素
項目 値
Epoch (epoch_cal, TDB) 1984-02-25.0000000
e 1.00012977
q (au) 2.254797
a (au) -17374.673642
i (deg) 120.736009
Ω (om, deg) 201.257657
ω (w, deg) 333.980548
M (ma, deg) 0.000038

等級

C/1983 O2 (IRAS) · Magnitude (Full range)

散乱 + 全体線形

$$ M_a = (6.786 + 5.716\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$

モデル定数

項目 値
H0 6.786
n 5.716
gf 1.000
gb -0.500
k 1.000
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 01:57:50.37 +54:28:03.5 HIP 9181 8.08
2026-02-03 12:00 01:57:50.97 +54:27:46.1 HIP 9181 7.78
2026-02-04 00:00 01:57:51.58 +54:27:28.8 HIP 9181 7.47
2026-02-04 12:00 01:57:52.23 +54:27:11.5 HIP 9181 7.17
2026-02-05 00:00 01:57:52.89 +54:26:54.4 HIP 9181 6.87
2026-02-05 12:00 01:57:53.58 +54:26:37.4 HIP 9181 6.57
2026-02-06 00:00 01:57:54.30 +54:26:20.5 HIP 9181 6.27
2026-02-06 12:00 01:57:55.04 +54:26:03.6 HIP 9181 5.97
2026-02-07 00:00 01:57:55.80 +54:25:46.9 HIP 9181 5.67
2026-02-07 12:00 01:57:56.59 +54:25:30.3 HIP 9181 5.37
2026-02-08 00:00 01:57:57.40 +54:25:13.8 HIP 9181 5.07
2026-02-08 12:00 01:57:58.24 +54:24:57.4 HIP 9181 4.77
2026-02-09 00:00 01:57:59.10 +54:24:41.1 HIP 9181 4.47
2026-02-09 12:00 01:57:59.99 +54:24:24.9 HIP 9181 4.18
2026-02-10 00:00 01:58:00.89 +54:24:08.9 HIP 9181 3.88
2026-02-10 12:00 01:58:01.83 +54:23:52.9 HIP 9181 3.58
2026-02-11 00:00 01:58:02.78 +54:23:37.1 HIP 9181 3.28
2026-02-11 12:00 01:58:03.76 +54:23:21.4 HIP 9181 2.99
2026-02-12 00:00 01:58:04.76 +54:23:05.8 HIP 9181 2.69
2026-02-12 12:00 01:58:05.79 +54:22:50.3 HIP 9181 2.40
2026-02-13 00:00 01:58:06.84 +54:22:34.9 HIP 9181 2.11
2026-02-13 12:00 01:58:07.91 +54:22:19.7 HIP 9181 1.83
2026-02-14 00:00 01:58:09.01 +54:22:04.5 HIP 9181 1.55
2026-02-14 12:00 01:58:10.13 +54:21:49.5 HIP 9181 1.28
2026-02-15 00:00 01:58:11.27 +54:21:34.7 HIP 9181 1.03
2026-02-15 12:00 01:58:12.44 +54:21:19.9 HIP 9181 0.82
2026-02-16 00:00 01:58:13.62 +54:21:05.3 HIP 9181 0.68
2026-02-16 12:00 01:58:14.83 +54:20:50.8 HIP 9181 0.66
2026-02-17 00:00 01:58:16.07 +54:20:36.4 HIP 9181 0.77
2026-02-17 12:00 01:58:17.32 +54:20:22.1 HIP 9181 0.97
2026-02-18 00:00 01:58:18.60 +54:20:08.0 HIP 9181 1.21
2026-02-18 12:00 01:58:19.90 +54:19:54.0 HIP 9181 1.48
2026-02-19 00:00 01:58:21.22 +54:19:40.2 HIP 9181 1.76
2026-02-19 12:00 01:58:22.56 +54:19:26.4 HIP 9181 2.04
2026-02-20 00:00 01:58:23.93 +54:19:12.9 HIP 9181 2.33
2026-02-20 12:00 01:58:25.32 +54:18:59.4 HIP 9181 2.63
2026-02-21 00:00 01:58:26.72 +54:18:46.1 HIP 9181 2.93
2026-02-21 12:00 01:58:28.15 +54:18:32.9 HIP 9181 3.23
2026-02-22 00:00 01:58:29.60 +54:18:19.8 HIP 9181 3.53
2026-02-22 12:00 01:58:31.08 +54:18:06.9 HIP 9181 3.83
2026-02-23 00:00 01:58:32.57 +54:17:54.1 HIP 9181 4.13
2026-02-23 12:00 01:58:34.08 +54:17:41.5 HIP 9181 4.44
2026-02-24 00:00 01:58:35.62 +54:17:29.0 HIP 9181 4.74