Comet Archive

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C/1973 H1 (Huchra)

メタデータ

項目 値
Designation C/1973 H1 (Huchra)
Type C
Perihelion (tp_cal, UTC) 1973-03-11T12:39:25.813440Z
Orbit solution date (soln_date, UTC) 2021-04-15T23:29:22Z
Obs used 26
NEO -
M1 9.300
K1 10.000
PC -
オスキュレーティング軌道要素
項目 値
Epoch (epoch_cal, TDB) 1973-05-30.0000000
e 0.97294134
q (au) 2.384240
a (au) 88.113743
i (deg) 48.329625
Ω (om, deg) 57.840302
ω (w, deg) 123.470767
M (ma, deg) 0.094701

等級

C/1973 H1 (Huchra) · Magnitude (Full range)

散乱 + 全体線形

$$ M_a = (9.905 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$

モデル定数

項目 値
H0 9.905
n 6.000
gf 1.000
gb -1.000
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 01:00:24.43 -43:41:38.6 HIP 4528 29.91
2026-02-03 12:00 01:00:25.48 -43:41:17.5 HIP 4528 29.92
2026-02-04 00:00 01:00:26.55 -43:40:56.4 HIP 4528 29.93
2026-02-04 12:00 01:00:27.64 -43:40:35.4 HIP 4528 29.96
2026-02-05 00:00 01:00:28.74 -43:40:14.4 HIP 4607 29.83
2026-02-05 12:00 01:00:29.86 -43:39:53.4 HIP 4607 29.64
2026-02-06 00:00 01:00:30.99 -43:39:32.5 HIP 4607 29.46
2026-02-06 12:00 01:00:32.14 -43:39:11.6 HIP 4607 29.28
2026-02-07 00:00 01:00:33.31 -43:38:50.7 HIP 4607 29.11
2026-02-07 12:00 01:00:34.49 -43:38:29.9 HIP 4607 28.95
2026-02-08 00:00 01:00:35.69 -43:38:09.2 HIP 4607 28.79
2026-02-08 12:00 01:00:36.90 -43:37:48.5 HIP 4607 28.65
2026-02-09 00:00 01:00:38.13 -43:37:27.8 HIP 4607 28.51
2026-02-09 12:00 01:00:39.38 -43:37:07.2 HIP 4607 28.37
2026-02-10 00:00 01:00:40.64 -43:36:46.7 HIP 4607 28.25
2026-02-10 12:00 01:00:41.91 -43:36:26.2 HIP 4607 28.13
2026-02-11 00:00 01:00:43.21 -43:36:05.7 HIP 4607 28.02
2026-02-11 12:00 01:00:44.51 -43:35:45.3 HIP 4607 27.92
2026-02-12 00:00 01:00:45.83 -43:35:25.0 HIP 4607 27.83
2026-02-12 12:00 01:00:47.17 -43:35:04.7 HIP 4607 27.75
2026-02-13 00:00 01:00:48.52 -43:34:44.5 HIP 4607 27.67
2026-02-13 12:00 01:00:49.89 -43:34:24.3 HIP 4607 27.61
2026-02-14 00:00 01:00:51.27 -43:34:04.2 HIP 4607 27.55
2026-02-14 12:00 01:00:52.67 -43:33:44.2 HIP 4607 27.50
2026-02-15 00:00 01:00:54.08 -43:33:24.2 HIP 4607 27.46
2026-02-15 12:00 01:00:55.50 -43:33:04.3 HIP 4607 27.43
2026-02-16 00:00 01:00:56.94 -43:32:44.5 HIP 4607 27.41
2026-02-16 12:00 01:00:58.39 -43:32:24.7 HIP 4607 27.40
2026-02-17 00:00 01:00:59.86 -43:32:05.0 HIP 4607 27.39
2026-02-17 12:00 01:01:01.34 -43:31:45.4 HIP 4607 27.40
2026-02-18 00:00 01:01:02.83 -43:31:25.9 HIP 4607 27.42
2026-02-18 12:00 01:01:04.34 -43:31:06.4 HIP 4607 27.44
2026-02-19 00:00 01:01:05.86 -43:30:47.0 HIP 4607 27.48
2026-02-19 12:00 01:01:07.40 -43:30:27.7 HIP 4607 27.52
2026-02-20 00:00 01:01:08.95 -43:30:08.5 HIP 4607 27.57
2026-02-20 12:00 01:01:10.51 -43:29:49.3 HIP 4607 27.64
2026-02-21 00:00 01:01:12.08 -43:29:30.3 HIP 4607 27.71
2026-02-21 12:00 01:01:13.67 -43:29:11.3 HIP 4607 27.79
2026-02-22 00:00 01:01:15.27 -43:28:52.4 HIP 4607 27.88
2026-02-22 12:00 01:01:16.88 -43:28:33.6 HIP 4607 27.98
2026-02-23 00:00 01:01:18.51 -43:28:14.9 HIP 4607 28.09
2026-02-23 12:00 01:01:20.15 -43:27:56.3 HIP 4607 28.20
2026-02-24 00:00 01:01:21.80 -43:27:37.7 HIP 4607 28.33