メタデータ
| 項目 |
値 |
| Designation |
C/2003 H2 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2003-05-17T23:15:08.225280Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:29Z |
| Obs used |
189 |
| NEO |
- |
| M1 |
14.200 |
| K1 |
10.000 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2003-05-22.0000000 |
| e |
0.94291012 |
| q (au) |
2.178516 |
| a (au) |
38.159402 |
| i (deg) |
74.217540 |
| Ω (om, deg) |
79.838018 |
| ω (w, deg) |
155.082163 |
| M (ma, deg) |
0.016855 |
等級
散乱 + 全体線形
$$
M_a = (14.725 + 2.527\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
14.725 |
| n |
2.527 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
0.999 |
| 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 |
04:35:38.96 |
-20:33:30.7 |
HIP 21367 |
13.73 |
| 2026-03-26 12:00 |
04:35:40.34 |
-20:32:57.2 |
HIP 21367 |
14.37 |
| 2026-03-27 00:00 |
04:35:41.75 |
-20:32:23.7 |
HIP 21367 |
15.02 |
| 2026-03-27 12:00 |
04:35:43.19 |
-20:31:50.4 |
HIP 21367 |
15.66 |
| 2026-03-28 00:00 |
04:35:44.65 |
-20:31:17.1 |
HIP 21367 |
16.31 |
| 2026-03-28 12:00 |
04:35:46.13 |
-20:30:43.9 |
HIP 21367 |
16.96 |
| 2026-03-29 00:00 |
04:35:47.64 |
-20:30:10.9 |
HIP 21367 |
17.62 |
| 2026-03-29 12:00 |
04:35:49.18 |
-20:29:37.9 |
HIP 21367 |
18.28 |
| 2026-03-30 00:00 |
04:35:50.74 |
-20:29:05.0 |
HIP 21420 |
18.70 |
| 2026-03-30 12:00 |
04:35:52.32 |
-20:28:32.3 |
HIP 21420 |
18.14 |
| 2026-03-31 00:00 |
04:35:53.92 |
-20:27:59.6 |
HIP 21420 |
17.60 |
| 2026-03-31 12:00 |
04:35:55.55 |
-20:27:27.1 |
HIP 21420 |
17.06 |
| 2026-04-01 00:00 |
04:35:57.21 |
-20:26:54.6 |
HIP 21420 |
16.53 |
| 2026-04-01 12:00 |
04:35:58.89 |
-20:26:22.3 |
HIP 21420 |
16.02 |
| 2026-04-02 00:00 |
04:36:00.59 |
-20:25:50.1 |
HIP 21420 |
15.52 |
| 2026-04-02 12:00 |
04:36:02.31 |
-20:25:18.0 |
HIP 21420 |
15.03 |
| 2026-04-03 00:00 |
04:36:04.06 |
-20:24:46.0 |
HIP 21420 |
14.57 |
| 2026-04-03 12:00 |
04:36:05.83 |
-20:24:14.1 |
HIP 21420 |
14.12 |
| 2026-04-04 00:00 |
04:36:07.62 |
-20:23:42.4 |
HIP 21420 |
13.70 |
| 2026-04-04 12:00 |
04:36:09.44 |
-20:23:10.7 |
HIP 21420 |
13.30 |
| 2026-04-05 00:00 |
04:36:11.28 |
-20:22:39.2 |
HIP 21420 |
12.92 |
| 2026-04-05 12:00 |
04:36:13.14 |
-20:22:07.8 |
HIP 21420 |
12.58 |
| 2026-04-06 00:00 |
04:36:15.02 |
-20:21:36.6 |
HIP 21420 |
12.27 |
| 2026-04-06 12:00 |
04:36:16.93 |
-20:21:05.5 |
HIP 21420 |
11.99 |
| 2026-04-07 00:00 |
04:36:18.85 |
-20:20:34.5 |
HIP 21420 |
11.75 |
| 2026-04-07 12:00 |
04:36:20.80 |
-20:20:03.6 |
HIP 21420 |
11.55 |
| 2026-04-08 00:00 |
04:36:22.77 |
-20:19:32.9 |
HIP 21420 |
11.40 |
| 2026-04-08 12:00 |
04:36:24.77 |
-20:19:02.3 |
HIP 21420 |
11.29 |
| 2026-04-09 00:00 |
04:36:26.78 |
-20:18:31.8 |
HIP 21420 |
11.22 |
| 2026-04-09 12:00 |
04:36:28.82 |
-20:18:01.5 |
HIP 21420 |
11.21 |
| 2026-04-10 00:00 |
04:36:30.87 |
-20:17:31.3 |
HIP 21420 |
11.24 |
| 2026-04-10 12:00 |
04:36:32.95 |
-20:17:01.3 |
HIP 21420 |
11.32 |
| 2026-04-11 00:00 |
04:36:35.05 |
-20:16:31.4 |
HIP 21420 |
11.45 |
| 2026-04-11 12:00 |
04:36:37.17 |
-20:16:01.7 |
HIP 21420 |
11.63 |
| 2026-04-12 00:00 |
04:36:39.31 |
-20:15:32.1 |
HIP 21420 |
11.85 |
| 2026-04-12 12:00 |
04:36:41.47 |
-20:15:02.7 |
HIP 21420 |
12.11 |
| 2026-04-13 00:00 |
04:36:43.65 |
-20:14:33.4 |
HIP 21420 |
12.41 |
| 2026-04-13 12:00 |
04:36:45.85 |
-20:14:04.2 |
HIP 21420 |
12.75 |
| 2026-04-14 00:00 |
04:36:48.08 |
-20:13:35.3 |
HIP 21420 |
13.13 |
| 2026-04-14 12:00 |
04:36:50.32 |
-20:13:06.4 |
HIP 21420 |
13.53 |
| 2026-04-15 00:00 |
04:36:52.58 |
-20:12:37.8 |
HIP 21420 |
13.97 |
| 2026-04-15 12:00 |
04:36:54.86 |
-20:12:09.3 |
HIP 21420 |
14.43 |
| 2026-04-16 00:00 |
04:36:57.16 |
-20:11:41.0 |
HIP 21420 |
14.92 |