メタデータ
| 項目 |
値 |
| Designation |
C/2014 H1 (Christensen) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2014-04-15T07:54:21.663360Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:53Z |
| Obs used |
105 |
| NEO |
- |
| M1 |
14.800 |
| 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) |
2014-05-03.0000000 |
| e |
0.98485086 |
| q (au) |
2.138899 |
| a (au) |
141.189497 |
| i (deg) |
99.935932 |
| Ω (om, deg) |
34.701528 |
| ω (w, deg) |
169.184849 |
| M (ma, deg) |
0.010381 |
等級
散乱 + 全体線形
$$
M_a = (18.467 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
18.467 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.651 |
| 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) |
| 2026-07-29 00:00 |
03:41:57.41 |
-22:23:05.1 |
HIP 17123 |
29.74 |
| 2026-07-29 12:00 |
03:41:58.83 |
-22:23:36.9 |
HIP 17123 |
30.27 |
| 2026-07-30 00:00 |
03:42:00.22 |
-22:24:09.0 |
HIP 17123 |
30.79 |
| 2026-07-30 12:00 |
03:42:01.57 |
-22:24:41.3 |
HIP 17123 |
31.32 |
| 2026-07-31 00:00 |
03:42:02.89 |
-22:25:13.8 |
HIP 17350 |
31.27 |
| 2026-07-31 12:00 |
03:42:04.17 |
-22:25:46.6 |
HIP 17350 |
30.66 |
| 2026-08-01 00:00 |
03:42:05.41 |
-22:26:19.5 |
HIP 17350 |
30.04 |
| 2026-08-01 12:00 |
03:42:06.63 |
-22:26:52.7 |
HIP 17350 |
29.43 |
| 2026-08-02 00:00 |
03:42:07.80 |
-22:27:26.1 |
HIP 17350 |
28.81 |
| 2026-08-02 12:00 |
03:42:08.94 |
-22:27:59.7 |
HIP 17350 |
28.20 |
| 2026-08-03 00:00 |
03:42:10.05 |
-22:28:33.5 |
HIP 17350 |
27.58 |
| 2026-08-03 12:00 |
03:42:11.12 |
-22:29:07.5 |
HIP 17350 |
26.96 |
| 2026-08-04 00:00 |
03:42:12.16 |
-22:29:41.8 |
HIP 17350 |
26.35 |
| 2026-08-04 12:00 |
03:42:13.15 |
-22:30:16.2 |
HIP 17350 |
25.73 |
| 2026-08-05 00:00 |
03:42:14.12 |
-22:30:50.8 |
HIP 17350 |
25.11 |
| 2026-08-05 12:00 |
03:42:15.04 |
-22:31:25.6 |
HIP 17350 |
24.49 |
| 2026-08-06 00:00 |
03:42:15.93 |
-22:32:00.6 |
HIP 17350 |
23.87 |
| 2026-08-06 12:00 |
03:42:16.79 |
-22:32:35.9 |
HIP 17350 |
23.26 |
| 2026-08-07 00:00 |
03:42:17.60 |
-22:33:11.2 |
HIP 17350 |
22.64 |
| 2026-08-07 12:00 |
03:42:18.38 |
-22:33:46.8 |
HIP 17350 |
22.02 |
| 2026-08-08 00:00 |
03:42:19.13 |
-22:34:22.6 |
HIP 17350 |
21.40 |
| 2026-08-08 12:00 |
03:42:19.83 |
-22:34:58.5 |
HIP 17350 |
20.78 |
| 2026-08-09 00:00 |
03:42:20.50 |
-22:35:34.7 |
HIP 17350 |
20.16 |
| 2026-08-09 12:00 |
03:42:21.14 |
-22:36:11.0 |
HIP 17350 |
19.54 |
| 2026-08-10 00:00 |
03:42:21.73 |
-22:36:47.5 |
HIP 17350 |
18.92 |
| 2026-08-10 12:00 |
03:42:22.29 |
-22:37:24.1 |
HIP 17350 |
18.30 |
| 2026-08-11 00:00 |
03:42:22.81 |
-22:38:00.9 |
HIP 17350 |
17.68 |
| 2026-08-11 12:00 |
03:42:23.29 |
-22:38:37.9 |
HIP 17350 |
17.07 |
| 2026-08-12 00:00 |
03:42:23.74 |
-22:39:15.1 |
HIP 17350 |
16.45 |
| 2026-08-12 12:00 |
03:42:24.14 |
-22:39:52.4 |
HIP 17350 |
15.84 |
| 2026-08-13 00:00 |
03:42:24.51 |
-22:40:29.8 |
HIP 17350 |
15.22 |
| 2026-08-13 12:00 |
03:42:24.84 |
-22:41:07.5 |
HIP 17350 |
14.62 |
| 2026-08-14 00:00 |
03:42:25.13 |
-22:41:45.2 |
HIP 17350 |
14.01 |
| 2026-08-14 12:00 |
03:42:25.39 |
-22:42:23.1 |
HIP 17350 |
13.41 |
| 2026-08-15 00:00 |
03:42:25.60 |
-22:43:01.2 |
HIP 17350 |
12.81 |
| 2026-08-15 12:00 |
03:42:25.78 |
-22:43:39.4 |
HIP 17350 |
12.22 |
| 2026-08-16 00:00 |
03:42:25.92 |
-22:44:17.7 |
HIP 17350 |
11.63 |
| 2026-08-16 12:00 |
03:42:26.02 |
-22:44:56.2 |
HIP 17350 |
11.06 |
| 2026-08-17 00:00 |
03:42:26.09 |
-22:45:34.8 |
HIP 17350 |
10.49 |
| 2026-08-17 12:00 |
03:42:26.11 |
-22:46:13.5 |
HIP 17350 |
9.94 |
| 2026-08-18 00:00 |
03:42:26.10 |
-22:46:52.3 |
HIP 17350 |
9.40 |
| 2026-08-18 12:00 |
03:42:26.04 |
-22:47:31.3 |
HIP 17350 |
8.88 |
| 2026-08-19 00:00 |
03:42:25.95 |
-22:48:10.4 |
HIP 17350 |
8.38 |