C/2015 M1 (PANSTARRS)
メタデータ
| 項目 |
値 |
| Designation |
C/2015 M1 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2015-05-15T16:23:58.865280Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:13Z |
| Obs used |
66 |
| NEO |
- |
| M1 |
15.900 |
| 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) |
2015-06-30.0000000 |
| e |
0.99457925 |
| q (au) |
2.091599 |
| a (au) |
385.850445 |
| i (deg) |
57.309532 |
| Ω (om, deg) |
100.291624 |
| ω (w, deg) |
163.983025 |
| M (ma, deg) |
0.005893 |
等級
散乱 + 全体線形
$$
M_a = (17.909 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
17.909 |
| n |
2.000 |
| gf |
0.926 |
| gb |
-1.000 |
| k |
0.998 |
| δ90 |
1.000 |
| 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) |
| 2026-02-03 00:00 |
04:42:45.48 |
-18:06:40.1 |
HIP 21925 |
17.13 |
| 2026-02-03 12:00 |
04:42:43.37 |
-18:05:57.7 |
HIP 21925 |
16.48 |
| 2026-02-04 00:00 |
04:42:41.29 |
-18:05:15.0 |
HIP 21925 |
15.85 |
| 2026-02-04 12:00 |
04:42:39.25 |
-18:04:32.1 |
HIP 21925 |
15.23 |
| 2026-02-05 00:00 |
04:42:37.26 |
-18:03:48.9 |
HIP 21925 |
14.63 |
| 2026-02-05 12:00 |
04:42:35.30 |
-18:03:05.6 |
HIP 21925 |
14.06 |
| 2026-02-06 00:00 |
04:42:33.39 |
-18:02:22.1 |
HIP 21925 |
13.51 |
| 2026-02-06 12:00 |
04:42:31.51 |
-18:01:38.3 |
HIP 21925 |
12.98 |
| 2026-02-07 00:00 |
04:42:29.68 |
-18:00:54.4 |
HIP 21925 |
12.48 |
| 2026-02-07 12:00 |
04:42:27.89 |
-18:00:10.3 |
HIP 21925 |
12.02 |
| 2026-02-08 00:00 |
04:42:26.14 |
-17:59:25.9 |
HIP 21925 |
11.59 |
| 2026-02-08 12:00 |
04:42:24.43 |
-17:58:41.4 |
HIP 21925 |
11.20 |
| 2026-02-09 00:00 |
04:42:22.76 |
-17:57:56.7 |
HIP 21925 |
10.86 |
| 2026-02-09 12:00 |
04:42:21.14 |
-17:57:11.8 |
HIP 21925 |
10.56 |
| 2026-02-10 00:00 |
04:42:19.55 |
-17:56:26.8 |
HIP 21925 |
10.31 |
| 2026-02-10 12:00 |
04:42:18.01 |
-17:55:41.5 |
HIP 21925 |
10.12 |
| 2026-02-11 00:00 |
04:42:16.51 |
-17:54:56.1 |
HIP 21925 |
9.99 |
| 2026-02-11 12:00 |
04:42:15.05 |
-17:54:10.5 |
HIP 21925 |
9.91 |
| 2026-02-12 00:00 |
04:42:13.63 |
-17:53:24.8 |
HIP 21925 |
9.89 |
| 2026-02-12 12:00 |
04:42:12.26 |
-17:52:38.9 |
HIP 21925 |
9.94 |
| 2026-02-13 00:00 |
04:42:10.92 |
-17:51:52.8 |
HIP 21925 |
10.04 |
| 2026-02-13 12:00 |
04:42:09.63 |
-17:51:06.6 |
HIP 21925 |
10.20 |
| 2026-02-14 00:00 |
04:42:08.39 |
-17:50:20.2 |
HIP 21925 |
10.41 |
| 2026-02-14 12:00 |
04:42:07.18 |
-17:49:33.7 |
HIP 21925 |
10.67 |
| 2026-02-15 00:00 |
04:42:06.02 |
-17:48:47.0 |
HIP 21925 |
10.98 |
| 2026-02-15 12:00 |
04:42:04.90 |
-17:48:00.2 |
HIP 21925 |
11.33 |
| 2026-02-16 00:00 |
04:42:03.82 |
-17:47:13.2 |
HIP 21925 |
11.72 |
| 2026-02-16 12:00 |
04:42:02.79 |
-17:46:26.2 |
HIP 21925 |
12.14 |
| 2026-02-17 00:00 |
04:42:01.79 |
-17:45:38.9 |
HIP 21925 |
12.59 |
| 2026-02-17 12:00 |
04:42:00.84 |
-17:44:51.6 |
HIP 21816 |
12.80 |
| 2026-02-18 00:00 |
04:41:59.94 |
-17:44:04.1 |
HIP 21816 |
12.16 |
| 2026-02-18 12:00 |
04:41:59.07 |
-17:43:16.6 |
HIP 21816 |
11.56 |
| 2026-02-19 00:00 |
04:41:58.25 |
-17:42:28.9 |
HIP 21816 |
10.99 |
| 2026-02-19 12:00 |
04:41:57.48 |
-17:41:41.1 |
HIP 21816 |
10.46 |
| 2026-02-20 00:00 |
04:41:56.74 |
-17:40:53.2 |
HIP 21816 |
9.98 |
| 2026-02-20 12:00 |
04:41:56.05 |
-17:40:05.1 |
HIP 21816 |
9.55 |
| 2026-02-21 00:00 |
04:41:55.40 |
-17:39:17.0 |
HIP 21816 |
9.19 |
| 2026-02-21 12:00 |
04:41:54.80 |
-17:38:28.8 |
HIP 21816 |
8.89 |
| 2026-02-22 00:00 |
04:41:54.23 |
-17:37:40.5 |
HIP 21816 |
8.68 |
| 2026-02-22 12:00 |
04:41:53.71 |
-17:36:52.1 |
HIP 21816 |
8.54 |
| 2026-02-23 00:00 |
04:41:53.24 |
-17:36:03.6 |
HIP 21816 |
8.50 |
| 2026-02-23 12:00 |
04:41:52.80 |
-17:35:15.1 |
HIP 21816 |
8.54 |
| 2026-02-24 00:00 |
04:41:52.41 |
-17:34:26.5 |
HIP 21816 |
8.67 |