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 |
0.999 |
| 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) |
| 2026-03-26 00:00 |
03:27:31.89 |
-22:54:51.0 |
HIP 16010 |
18.72 |
| 2026-03-26 12:00 |
03:27:34.67 |
-22:54:06.2 |
HIP 16010 |
19.35 |
| 2026-03-27 00:00 |
03:27:37.48 |
-22:53:21.5 |
HIP 16010 |
20.01 |
| 2026-03-27 12:00 |
03:27:40.32 |
-22:52:37.0 |
HIP 16010 |
20.70 |
| 2026-03-28 00:00 |
03:27:43.18 |
-22:51:52.7 |
HIP 16010 |
21.42 |
| 2026-03-28 12:00 |
03:27:46.07 |
-22:51:08.6 |
HIP 16010 |
22.16 |
| 2026-03-29 00:00 |
03:27:48.99 |
-22:50:24.7 |
HIP 16010 |
22.94 |
| 2026-03-29 12:00 |
03:27:51.93 |
-22:49:41.0 |
HIP 16010 |
23.73 |
| 2026-03-30 00:00 |
03:27:54.90 |
-22:48:57.5 |
HIP 16010 |
24.54 |
| 2026-03-30 12:00 |
03:27:57.90 |
-22:48:14.2 |
HIP 16010 |
25.38 |
| 2026-03-31 00:00 |
03:28:00.92 |
-22:47:31.1 |
HIP 16010 |
26.22 |
| 2026-03-31 12:00 |
03:28:03.96 |
-22:46:48.2 |
HIP 16010 |
27.09 |
| 2026-04-01 00:00 |
03:28:07.03 |
-22:46:05.5 |
HIP 16010 |
27.96 |
| 2026-04-01 12:00 |
03:28:10.13 |
-22:45:23.1 |
HIP 16274 |
27.34 |
| 2026-04-02 00:00 |
03:28:13.25 |
-22:44:40.8 |
HIP 16274 |
26.36 |
| 2026-04-02 12:00 |
03:28:16.40 |
-22:43:58.8 |
HIP 16274 |
25.37 |
| 2026-04-03 00:00 |
03:28:19.57 |
-22:43:17.0 |
HIP 16274 |
24.38 |
| 2026-04-03 12:00 |
03:28:22.76 |
-22:42:35.4 |
HIP 16274 |
23.39 |
| 2026-04-04 00:00 |
03:28:25.98 |
-22:41:54.0 |
HIP 16274 |
22.39 |
| 2026-04-04 12:00 |
03:28:29.22 |
-22:41:12.8 |
HIP 16274 |
21.40 |
| 2026-04-05 00:00 |
03:28:32.48 |
-22:40:31.9 |
HIP 16274 |
20.41 |
| 2026-04-05 12:00 |
03:28:35.77 |
-22:39:51.2 |
HIP 16274 |
19.41 |
| 2026-04-06 00:00 |
03:28:39.08 |
-22:39:10.7 |
HIP 16274 |
18.42 |
| 2026-04-06 12:00 |
03:28:42.41 |
-22:38:30.5 |
HIP 16274 |
17.42 |
| 2026-04-07 00:00 |
03:28:45.76 |
-22:37:50.5 |
HIP 16274 |
16.43 |
| 2026-04-07 12:00 |
03:28:49.14 |
-22:37:10.7 |
HIP 16274 |
15.44 |
| 2026-04-08 00:00 |
03:28:52.54 |
-22:36:31.2 |
HIP 16274 |
14.44 |
| 2026-04-08 12:00 |
03:28:55.96 |
-22:35:51.9 |
HIP 16274 |
13.45 |
| 2026-04-09 00:00 |
03:28:59.40 |
-22:35:12.9 |
HIP 16274 |
12.46 |
| 2026-04-09 12:00 |
03:29:02.86 |
-22:34:34.1 |
HIP 16274 |
11.48 |
| 2026-04-10 00:00 |
03:29:06.34 |
-22:33:55.5 |
HIP 16274 |
10.50 |
| 2026-04-10 12:00 |
03:29:09.84 |
-22:33:17.2 |
HIP 16274 |
9.53 |
| 2026-04-11 00:00 |
03:29:13.37 |
-22:32:39.2 |
HIP 16274 |
8.56 |
| 2026-04-11 12:00 |
03:29:16.91 |
-22:32:01.4 |
HIP 16274 |
7.61 |
| 2026-04-12 00:00 |
03:29:20.47 |
-22:31:23.9 |
HIP 16274 |
6.69 |
| 2026-04-12 12:00 |
03:29:24.05 |
-22:30:46.6 |
HIP 16274 |
5.79 |
| 2026-04-13 00:00 |
03:29:27.66 |
-22:30:09.6 |
HIP 16274 |
4.95 |
| 2026-04-13 12:00 |
03:29:31.28 |
-22:29:32.8 |
HIP 16274 |
4.18 |
| 2026-04-14 00:00 |
03:29:34.92 |
-22:28:56.3 |
HIP 16274 |
3.55 |
| 2026-04-14 12:00 |
03:29:38.57 |
-22:28:20.1 |
HIP 16274 |
3.14 |
| 2026-04-15 00:00 |
03:29:42.25 |
-22:27:44.1 |
HIP 16274 |
3.03 |
| 2026-04-15 12:00 |
03:29:45.94 |
-22:27:08.5 |
HIP 16274 |
3.27 |
| 2026-04-16 00:00 |
03:29:49.65 |
-22:26:33.0 |
HIP 16274 |
3.78 |