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
$$
M_a = (5.476 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
5.476 |
| n |
6.000 |
| gf |
0.946 |
| gb |
-0.947 |
| k |
1.000 |
| δ90 |
8.820 |
| 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) |
| 2026-06-01 00:00 |
20:05:11.45 |
-03:36:36.1 |
HIP 99024 |
31.91 |
| 2026-06-01 12:00 |
20:05:08.26 |
-03:36:30.5 |
HIP 99024 |
32.38 |
| 2026-06-02 00:00 |
20:05:05.02 |
-03:36:25.1 |
HIP 99024 |
32.86 |
| 2026-06-02 12:00 |
20:05:01.75 |
-03:36:20.0 |
HIP 99024 |
33.36 |
| 2026-06-03 00:00 |
20:04:58.43 |
-03:36:15.2 |
HIP 99024 |
33.87 |
| 2026-06-03 12:00 |
20:04:55.07 |
-03:36:10.6 |
HIP 99024 |
34.39 |
| 2026-06-04 00:00 |
20:04:51.66 |
-03:36:06.3 |
HIP 99024 |
34.93 |
| 2026-06-04 12:00 |
20:04:48.22 |
-03:36:02.3 |
HIP 99024 |
35.49 |
| 2026-06-05 00:00 |
20:04:44.74 |
-03:35:58.6 |
HIP 98685 |
35.22 |
| 2026-06-05 12:00 |
20:04:41.21 |
-03:35:55.1 |
HIP 98685 |
34.40 |
| 2026-06-06 00:00 |
20:04:37.65 |
-03:35:52.0 |
HIP 98685 |
33.59 |
| 2026-06-06 12:00 |
20:04:34.04 |
-03:35:49.1 |
HIP 98685 |
32.76 |
| 2026-06-07 00:00 |
20:04:30.40 |
-03:35:46.4 |
HIP 98685 |
31.94 |
| 2026-06-07 12:00 |
20:04:26.72 |
-03:35:44.1 |
HIP 98685 |
31.12 |
| 2026-06-08 00:00 |
20:04:23.00 |
-03:35:42.0 |
HIP 98685 |
30.29 |
| 2026-06-08 12:00 |
20:04:19.24 |
-03:35:40.3 |
HIP 98685 |
29.47 |
| 2026-06-09 00:00 |
20:04:15.44 |
-03:35:38.8 |
HIP 98685 |
28.65 |
| 2026-06-09 12:00 |
20:04:11.60 |
-03:35:37.5 |
HIP 98685 |
27.83 |
| 2026-06-10 00:00 |
20:04:07.73 |
-03:35:36.6 |
HIP 98685 |
27.01 |
| 2026-06-10 12:00 |
20:04:03.82 |
-03:35:35.9 |
HIP 98685 |
26.20 |
| 2026-06-11 00:00 |
20:03:59.87 |
-03:35:35.6 |
HIP 98685 |
25.40 |
| 2026-06-11 12:00 |
20:03:55.88 |
-03:35:35.5 |
HIP 98685 |
24.60 |
| 2026-06-12 00:00 |
20:03:51.86 |
-03:35:35.7 |
HIP 98685 |
23.82 |
| 2026-06-12 12:00 |
20:03:47.81 |
-03:35:36.2 |
HIP 98685 |
23.05 |
| 2026-06-13 00:00 |
20:03:43.71 |
-03:35:37.0 |
HIP 98685 |
22.29 |
| 2026-06-13 12:00 |
20:03:39.58 |
-03:35:38.0 |
HIP 98685 |
21.56 |
| 2026-06-14 00:00 |
20:03:35.42 |
-03:35:39.4 |
HIP 98685 |
20.85 |
| 2026-06-14 12:00 |
20:03:31.22 |
-03:35:41.0 |
HIP 98685 |
20.16 |
| 2026-06-15 00:00 |
20:03:26.99 |
-03:35:42.9 |
HIP 98685 |
19.50 |
| 2026-06-15 12:00 |
20:03:22.73 |
-03:35:45.2 |
HIP 98685 |
18.88 |
| 2026-06-16 00:00 |
20:03:18.43 |
-03:35:47.7 |
HIP 98685 |
18.30 |
| 2026-06-16 12:00 |
20:03:14.10 |
-03:35:50.5 |
HIP 98685 |
17.77 |
| 2026-06-17 00:00 |
20:03:09.73 |
-03:35:53.6 |
HIP 98685 |
17.29 |
| 2026-06-17 12:00 |
20:03:05.34 |
-03:35:56.9 |
HIP 98685 |
16.86 |
| 2026-06-18 00:00 |
20:03:00.91 |
-03:36:00.6 |
HIP 98685 |
16.50 |
| 2026-06-18 12:00 |
20:02:56.45 |
-03:36:04.5 |
HIP 98685 |
16.21 |
| 2026-06-19 00:00 |
20:02:51.96 |
-03:36:08.8 |
HIP 98685 |
16.00 |
| 2026-06-19 12:00 |
20:02:47.44 |
-03:36:13.3 |
HIP 98685 |
15.86 |
| 2026-06-20 00:00 |
20:02:42.89 |
-03:36:18.1 |
HIP 98685 |
15.81 |
| 2026-06-20 12:00 |
20:02:38.31 |
-03:36:23.2 |
HIP 98685 |
15.85 |
| 2026-06-21 00:00 |
20:02:33.71 |
-03:36:28.6 |
HIP 98685 |
15.97 |
| 2026-06-21 12:00 |
20:02:29.07 |
-03:36:34.3 |
HIP 98685 |
16.18 |
| 2026-06-22 00:00 |
20:02:24.41 |
-03:36:40.3 |
HIP 98685 |
16.48 |