メタデータ
| 項目 |
値 |
| Designation |
C/2004 C1 (Larsen) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2003-03-19T15:25:34.576320Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:36Z |
| Obs used |
94 |
| NEO |
- |
| M1 |
10.000 |
| 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) |
2004-02-26.0000000 |
| e |
0.62315774 |
| q (au) |
4.359408 |
| a (au) |
11.568256 |
| i (deg) |
28.916543 |
| Ω (om, deg) |
151.954024 |
| ω (w, deg) |
316.149884 |
| M (ma, deg) |
8.600990 |
等級
散乱 + 全体線形
$$
M_a = (5.482 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
5.482 |
| n |
6.000 |
| gf |
0.935 |
| gb |
-0.947 |
| k |
1.000 |
| δ90 |
8.473 |
| 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 |
20:04:57.90 |
-04:20:29.9 |
HIP 98916 |
3.07 |
| 2026-03-26 12:00 |
20:05:01.29 |
-04:20:01.9 |
HIP 98916 |
2.13 |
| 2026-03-27 00:00 |
20:05:04.64 |
-04:19:33.9 |
HIP 98916 |
1.25 |
| 2026-03-27 12:00 |
20:05:07.95 |
-04:19:05.9 |
HIP 98916 |
0.63 |
| 2026-03-28 00:00 |
20:05:11.21 |
-04:18:38.0 |
HIP 98916 |
1.00 |
| 2026-03-28 12:00 |
20:05:14.42 |
-04:18:10.1 |
HIP 98916 |
1.82 |
| 2026-03-29 00:00 |
20:05:17.58 |
-04:17:42.3 |
HIP 98916 |
2.70 |
| 2026-03-29 12:00 |
20:05:20.71 |
-04:17:14.5 |
HIP 98916 |
3.58 |
| 2026-03-30 00:00 |
20:05:23.78 |
-04:16:46.8 |
HIP 98916 |
4.47 |
| 2026-03-30 12:00 |
20:05:26.81 |
-04:16:19.1 |
HIP 98916 |
5.34 |
| 2026-03-31 00:00 |
20:05:29.79 |
-04:15:51.5 |
HIP 98916 |
6.21 |
| 2026-03-31 12:00 |
20:05:32.73 |
-04:15:23.9 |
HIP 98916 |
7.07 |
| 2026-04-01 00:00 |
20:05:35.61 |
-04:14:56.4 |
HIP 98916 |
7.92 |
| 2026-04-01 12:00 |
20:05:38.45 |
-04:14:29.0 |
HIP 98916 |
8.76 |
| 2026-04-02 00:00 |
20:05:41.25 |
-04:14:01.6 |
HIP 98916 |
9.59 |
| 2026-04-02 12:00 |
20:05:44.00 |
-04:13:34.2 |
HIP 98916 |
10.40 |
| 2026-04-03 00:00 |
20:05:46.70 |
-04:13:06.9 |
HIP 99024 |
10.56 |
| 2026-04-03 12:00 |
20:05:49.35 |
-04:12:39.7 |
HIP 99024 |
9.80 |
| 2026-04-04 00:00 |
20:05:51.95 |
-04:12:12.6 |
HIP 99024 |
9.06 |
| 2026-04-04 12:00 |
20:05:54.51 |
-04:11:45.5 |
HIP 99024 |
8.33 |
| 2026-04-05 00:00 |
20:05:57.01 |
-04:11:18.5 |
HIP 99024 |
7.63 |
| 2026-04-05 12:00 |
20:05:59.47 |
-04:10:51.6 |
HIP 99024 |
6.94 |
| 2026-04-06 00:00 |
20:06:01.89 |
-04:10:24.8 |
HIP 99024 |
6.28 |
| 2026-04-06 12:00 |
20:06:04.25 |
-04:09:58.0 |
HIP 99024 |
5.64 |
| 2026-04-07 00:00 |
20:06:06.56 |
-04:09:31.3 |
HIP 99024 |
5.03 |
| 2026-04-07 12:00 |
20:06:08.83 |
-04:09:04.7 |
HIP 99024 |
4.47 |
| 2026-04-08 00:00 |
20:06:11.04 |
-04:08:38.2 |
HIP 99024 |
3.96 |
| 2026-04-08 12:00 |
20:06:13.21 |
-04:08:11.7 |
HIP 99024 |
3.52 |
| 2026-04-09 00:00 |
20:06:15.33 |
-04:07:45.4 |
HIP 99024 |
3.17 |
| 2026-04-09 12:00 |
20:06:17.39 |
-04:07:19.1 |
HIP 99024 |
2.93 |
| 2026-04-10 00:00 |
20:06:19.41 |
-04:06:53.0 |
HIP 99024 |
2.84 |
| 2026-04-10 12:00 |
20:06:21.38 |
-04:06:26.9 |
HIP 99024 |
2.89 |
| 2026-04-11 00:00 |
20:06:23.30 |
-04:06:01.0 |
HIP 99024 |
3.07 |
| 2026-04-11 12:00 |
20:06:25.17 |
-04:05:35.1 |
HIP 99024 |
3.36 |
| 2026-04-12 00:00 |
20:06:26.98 |
-04:05:09.3 |
HIP 99024 |
3.72 |
| 2026-04-12 12:00 |
20:06:28.75 |
-04:04:43.7 |
HIP 99024 |
4.13 |
| 2026-04-13 00:00 |
20:06:30.47 |
-04:04:18.1 |
HIP 99024 |
4.57 |
| 2026-04-13 12:00 |
20:06:32.14 |
-04:03:52.7 |
HIP 99024 |
5.04 |
| 2026-04-14 00:00 |
20:06:33.75 |
-04:03:27.4 |
HIP 99024 |
5.52 |
| 2026-04-14 12:00 |
20:06:35.32 |
-04:03:02.1 |
HIP 99024 |
6.00 |
| 2026-04-15 00:00 |
20:06:36.83 |
-04:02:37.1 |
HIP 99024 |
6.48 |
| 2026-04-15 12:00 |
20:06:38.29 |
-04:02:12.1 |
HIP 99024 |
6.97 |
| 2026-04-16 00:00 |
20:06:39.71 |
-04:01:47.2 |
HIP 99024 |
7.45 |