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
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) |
| 2026-09-20 00:00 |
01:05:59.52 |
-44:15:06.8 |
HIP 5187 |
4.27 |
| 2026-09-20 12:00 |
01:05:57.50 |
-44:15:18.7 |
HIP 5187 |
4.63 |
| 2026-09-21 00:00 |
01:05:55.47 |
-44:15:30.5 |
HIP 5187 |
4.99 |
| 2026-09-21 12:00 |
01:05:53.43 |
-44:15:42.1 |
HIP 5187 |
5.36 |
| 2026-09-22 00:00 |
01:05:51.39 |
-44:15:53.6 |
HIP 5187 |
5.74 |
| 2026-09-22 12:00 |
01:05:49.34 |
-44:16:05.0 |
HIP 5187 |
6.12 |
| 2026-09-23 00:00 |
01:05:47.28 |
-44:16:16.1 |
HIP 5187 |
6.51 |
| 2026-09-23 12:00 |
01:05:45.22 |
-44:16:27.2 |
HIP 5187 |
6.90 |
| 2026-09-24 00:00 |
01:05:43.15 |
-44:16:38.1 |
HIP 5187 |
7.29 |
| 2026-09-24 12:00 |
01:05:41.08 |
-44:16:48.8 |
HIP 5187 |
7.69 |
| 2026-09-25 00:00 |
01:05:39.00 |
-44:16:59.4 |
HIP 5187 |
8.09 |
| 2026-09-25 12:00 |
01:05:36.91 |
-44:17:09.8 |
HIP 5187 |
8.49 |
| 2026-09-26 00:00 |
01:05:34.82 |
-44:17:20.1 |
HIP 5187 |
8.89 |
| 2026-09-26 12:00 |
01:05:32.73 |
-44:17:30.2 |
HIP 5187 |
9.29 |
| 2026-09-27 00:00 |
01:05:30.63 |
-44:17:40.2 |
HIP 5187 |
9.69 |
| 2026-09-27 12:00 |
01:05:28.53 |
-44:17:50.0 |
HIP 5187 |
10.10 |
| 2026-09-28 00:00 |
01:05:26.42 |
-44:17:59.7 |
HIP 5187 |
10.50 |
| 2026-09-28 12:00 |
01:05:24.31 |
-44:18:09.2 |
HIP 5187 |
10.91 |
| 2026-09-29 00:00 |
01:05:22.19 |
-44:18:18.5 |
HIP 5187 |
11.31 |
| 2026-09-29 12:00 |
01:05:20.07 |
-44:18:27.7 |
HIP 5187 |
11.72 |
| 2026-09-30 00:00 |
01:05:17.94 |
-44:18:36.7 |
HIP 5187 |
12.13 |
| 2026-09-30 12:00 |
01:05:15.82 |
-44:18:45.6 |
HIP 5187 |
12.53 |
| 2026-10-01 00:00 |
01:05:13.68 |
-44:18:54.3 |
HIP 5187 |
12.94 |
| 2026-10-01 12:00 |
01:05:11.55 |
-44:19:02.8 |
HIP 5187 |
13.35 |
| 2026-10-02 00:00 |
01:05:09.41 |
-44:19:11.2 |
HIP 5187 |
13.75 |
| 2026-10-02 12:00 |
01:05:07.27 |
-44:19:19.4 |
HIP 5187 |
14.16 |
| 2026-10-03 00:00 |
01:05:05.12 |
-44:19:27.5 |
HIP 5187 |
14.56 |
| 2026-10-03 12:00 |
01:05:02.97 |
-44:19:35.4 |
HIP 5187 |
14.97 |
| 2026-10-04 00:00 |
01:05:00.82 |
-44:19:43.1 |
HIP 5187 |
15.37 |
| 2026-10-04 12:00 |
01:04:58.67 |
-44:19:50.6 |
HIP 5187 |
15.78 |
| 2026-10-05 00:00 |
01:04:56.52 |
-44:19:58.0 |
HIP 4959 |
15.52 |
| 2026-10-05 12:00 |
01:04:54.36 |
-44:20:05.2 |
HIP 4959 |
15.20 |
| 2026-10-06 00:00 |
01:04:52.20 |
-44:20:12.3 |
HIP 4959 |
14.89 |
| 2026-10-06 12:00 |
01:04:50.04 |
-44:20:19.2 |
HIP 4959 |
14.57 |
| 2026-10-07 00:00 |
01:04:47.88 |
-44:20:25.9 |
HIP 4959 |
14.27 |
| 2026-10-07 12:00 |
01:04:45.71 |
-44:20:32.4 |
HIP 4959 |
13.96 |
| 2026-10-08 00:00 |
01:04:43.55 |
-44:20:38.8 |
HIP 4959 |
13.66 |
| 2026-10-08 12:00 |
01:04:41.38 |
-44:20:45.0 |
HIP 4959 |
13.36 |
| 2026-10-09 00:00 |
01:04:39.21 |
-44:20:51.0 |
HIP 4959 |
13.07 |
| 2026-10-09 12:00 |
01:04:37.05 |
-44:20:56.8 |
HIP 4959 |
12.78 |
| 2026-10-10 00:00 |
01:04:34.88 |
-44:21:02.5 |
HIP 4959 |
12.50 |
| 2026-10-10 12:00 |
01:04:32.71 |
-44:21:08.0 |
HIP 4959 |
12.22 |
| 2026-10-11 00:00 |
01:04:30.54 |
-44:21:13.3 |
HIP 4959 |
11.94 |