C/2025 M1 (PANSTARRS)
メタデータ
| 項目 |
値 |
| Designation |
C/2025 M1 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2029-08-03T14:40:29.219520Z |
| Orbit solution date (soln_date, UTC) |
2025-09-16T12:43:03Z |
| Obs used |
59 |
| NEO |
- |
| M1 |
6.700 |
| K1 |
7.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2025-06-21T08:14:47.731200Z |
| Discovery magnitude (MPC) |
20.92 w |
| Discovery observatory (MPC) |
F52 · Pan-STARRS 2, Haleakala |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2024-10-25.0000000 |
| e |
0.99850831 |
| q (au) |
10.825527 |
| a (au) |
7257.227193 |
| i (deg) |
64.906499 |
| Ω (om, deg) |
66.958356 |
| ω (w, deg) |
230.457563 |
| M (ma, deg) |
359.997220 |
等級
散乱 + 全体線形
$$
M_a = (-0.960 + 5.110\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
-0.960 |
| n |
5.110 |
| gf |
0.983 |
| gb |
-0.502 |
| k |
1.000 |
| 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) |
| 2026-02-03 00:00 |
16:44:35.01 |
-27:14:30.9 |
HIP 81981 |
13.26 |
| 2026-02-03 12:00 |
16:44:41.23 |
-27:15:37.1 |
HIP 81981 |
11.90 |
| 2026-02-04 00:00 |
16:44:47.37 |
-27:16:43.3 |
HIP 81981 |
10.66 |
| 2026-02-04 12:00 |
16:44:53.45 |
-27:17:49.4 |
HIP 81981 |
9.57 |
| 2026-02-05 00:00 |
16:44:59.46 |
-27:18:55.5 |
HIP 81981 |
8.70 |
| 2026-02-05 12:00 |
16:45:05.40 |
-27:20:01.6 |
HIP 81981 |
8.11 |
| 2026-02-06 00:00 |
16:45:11.27 |
-27:21:07.7 |
HIP 81981 |
7.84 |
| 2026-02-06 12:00 |
16:45:17.08 |
-27:22:13.8 |
HIP 81981 |
7.93 |
| 2026-02-07 00:00 |
16:45:22.81 |
-27:23:19.9 |
HIP 81981 |
8.35 |
| 2026-02-07 12:00 |
16:45:28.47 |
-27:24:25.9 |
HIP 81981 |
9.05 |
| 2026-02-08 00:00 |
16:45:34.05 |
-27:25:32.0 |
HIP 81981 |
9.97 |
| 2026-02-08 12:00 |
16:45:39.57 |
-27:26:38.0 |
HIP 81981 |
11.05 |
| 2026-02-09 00:00 |
16:45:45.01 |
-27:27:44.0 |
HIP 81981 |
12.24 |
| 2026-02-09 12:00 |
16:45:50.39 |
-27:28:49.9 |
HIP 81981 |
13.50 |
| 2026-02-10 00:00 |
16:45:55.68 |
-27:29:55.9 |
HIP 81981 |
14.82 |
| 2026-02-10 12:00 |
16:46:00.91 |
-27:31:01.8 |
HIP 81981 |
16.18 |
| 2026-02-11 00:00 |
16:46:06.06 |
-27:32:07.8 |
HIP 81981 |
17.56 |
| 2026-02-11 12:00 |
16:46:11.13 |
-27:33:13.7 |
HIP 81981 |
18.95 |
| 2026-02-12 00:00 |
16:46:16.13 |
-27:34:19.5 |
HIP 81981 |
20.35 |
| 2026-02-12 12:00 |
16:46:21.05 |
-27:35:25.4 |
HIP 81981 |
21.76 |
| 2026-02-13 00:00 |
16:46:25.90 |
-27:36:31.2 |
HIP 81981 |
23.17 |
| 2026-02-13 12:00 |
16:46:30.67 |
-27:37:37.1 |
HIP 81981 |
24.58 |
| 2026-02-14 00:00 |
16:46:35.36 |
-27:38:42.9 |
HIP 82008 |
25.36 |
| 2026-02-14 12:00 |
16:46:39.97 |
-27:39:48.6 |
HIP 82008 |
25.45 |
| 2026-02-15 00:00 |
16:46:44.51 |
-27:40:54.4 |
HIP 82008 |
25.62 |
| 2026-02-15 12:00 |
16:46:48.97 |
-27:42:00.1 |
HIP 82008 |
25.85 |
| 2026-02-16 00:00 |
16:46:53.34 |
-27:43:05.8 |
HIP 82008 |
26.16 |
| 2026-02-16 12:00 |
16:46:57.64 |
-27:44:11.5 |
HIP 82008 |
26.52 |
| 2026-02-17 00:00 |
16:47:01.86 |
-27:45:17.1 |
HIP 82008 |
26.94 |
| 2026-02-17 12:00 |
16:47:06.00 |
-27:46:22.7 |
HIP 82008 |
27.41 |
| 2026-02-18 00:00 |
16:47:10.06 |
-27:47:28.3 |
HIP 82008 |
27.93 |
| 2026-02-18 12:00 |
16:47:14.03 |
-27:48:33.9 |
HIP 82008 |
28.49 |
| 2026-02-19 00:00 |
16:47:17.93 |
-27:49:39.4 |
HIP 82315 |
28.85 |
| 2026-02-19 12:00 |
16:47:21.74 |
-27:50:44.9 |
HIP 82315 |
28.75 |
| 2026-02-20 00:00 |
16:47:25.47 |
-27:51:50.4 |
HIP 82315 |
28.73 |
| 2026-02-20 12:00 |
16:47:29.12 |
-27:52:55.8 |
HIP 82315 |
28.79 |
| 2026-02-21 00:00 |
16:47:32.68 |
-27:54:01.2 |
HIP 82315 |
28.93 |
| 2026-02-21 12:00 |
16:47:36.16 |
-27:55:06.6 |
HIP 82229 |
28.12 |
| 2026-02-22 00:00 |
16:47:39.56 |
-27:56:12.0 |
HIP 82229 |
26.93 |
| 2026-02-22 12:00 |
16:47:42.87 |
-27:57:17.3 |
HIP 82229 |
25.75 |
| 2026-02-23 00:00 |
16:47:46.10 |
-27:58:22.6 |
HIP 82229 |
24.59 |
| 2026-02-23 12:00 |
16:47:49.24 |
-27:59:27.8 |
HIP 82229 |
23.44 |
| 2026-02-24 00:00 |
16:47:52.30 |
-28:00:33.0 |
HIP 82229 |
22.31 |