C/2025 M2 (PANSTARRS)
メタデータ
| 項目 |
値 |
| Designation |
C/2025 M2 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2027-11-23T09:12:57.807360Z |
| Orbit solution date (soln_date, UTC) |
2025-10-28T16:12:44Z |
| Obs used |
149 |
| NEO |
- |
| M1 |
6.800 |
| K1 |
9.750 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2025-06-22T12:55:09.638400Z |
| Discovery magnitude (MPC) |
20.66 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) |
2025-07-23.0000000 |
| e |
1.00205724 |
| q (au) |
2.719675 |
| a (au) |
-1322.004067 |
| i (deg) |
173.214318 |
| Ω (om, deg) |
305.535343 |
| ω (w, deg) |
96.770779 |
| M (ma, deg) |
-0.017498 |
等級
散乱 + 全体線形
$$
M_a = (5.774 + 5.568\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
5.774 |
| n |
5.568 |
| gf |
1.000 |
| gb |
-0.705 |
| k |
0.800 |
| δ90 |
9.998 |
| 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 |
20:49:40.62 |
-18:09:04.1 |
HIP 102780 |
8.41 |
| 2026-02-03 12:00 |
20:49:50.92 |
-18:08:13.2 |
HIP 102780 |
9.44 |
| 2026-02-04 00:00 |
20:50:01.23 |
-18:07:22.4 |
HIP 102780 |
10.99 |
| 2026-02-04 12:00 |
20:50:11.53 |
-18:06:31.5 |
HIP 102780 |
12.88 |
| 2026-02-05 00:00 |
20:50:21.83 |
-18:05:40.5 |
HIP 102780 |
14.99 |
| 2026-02-05 12:00 |
20:50:32.13 |
-18:04:49.6 |
HIP 102780 |
17.23 |
| 2026-02-06 00:00 |
20:50:42.42 |
-18:03:58.6 |
HIP 102780 |
19.55 |
| 2026-02-06 12:00 |
20:50:52.71 |
-18:03:07.6 |
HIP 102780 |
21.93 |
| 2026-02-07 00:00 |
20:51:03.00 |
-18:02:16.5 |
HIP 102780 |
24.36 |
| 2026-02-07 12:00 |
20:51:13.28 |
-18:01:25.5 |
HIP 102780 |
26.81 |
| 2026-02-08 00:00 |
20:51:23.55 |
-18:00:34.4 |
HIP 102780 |
29.29 |
| 2026-02-08 12:00 |
20:51:33.81 |
-17:59:43.4 |
HIP 102780 |
31.78 |
| 2026-02-09 00:00 |
20:51:44.07 |
-17:58:52.3 |
HIP 102780 |
34.28 |
| 2026-02-09 12:00 |
20:51:54.31 |
-17:58:01.2 |
HIP 102780 |
36.79 |
| 2026-02-10 00:00 |
20:52:04.54 |
-17:57:10.2 |
HIP 103226 |
38.88 |
| 2026-02-10 12:00 |
20:52:14.76 |
-17:56:19.1 |
HIP 103226 |
36.43 |
| 2026-02-11 00:00 |
20:52:24.97 |
-17:55:28.0 |
HIP 103226 |
33.99 |
| 2026-02-11 12:00 |
20:52:35.17 |
-17:54:37.0 |
HIP 103226 |
31.57 |
| 2026-02-12 00:00 |
20:52:45.35 |
-17:53:46.0 |
HIP 103226 |
29.19 |
| 2026-02-12 12:00 |
20:52:55.51 |
-17:52:55.0 |
HIP 103226 |
26.84 |
| 2026-02-13 00:00 |
20:53:05.66 |
-17:52:04.0 |
HIP 103226 |
24.54 |
| 2026-02-13 12:00 |
20:53:15.79 |
-17:51:13.1 |
HIP 103226 |
22.29 |
| 2026-02-14 00:00 |
20:53:25.90 |
-17:50:22.2 |
HIP 103226 |
20.13 |
| 2026-02-14 12:00 |
20:53:35.99 |
-17:49:31.3 |
HIP 103226 |
18.07 |
| 2026-02-15 00:00 |
20:53:46.06 |
-17:48:40.4 |
HIP 103226 |
16.16 |
| 2026-02-15 12:00 |
20:53:56.11 |
-17:47:49.7 |
HIP 103226 |
14.44 |
| 2026-02-16 00:00 |
20:54:06.14 |
-17:46:58.9 |
HIP 103226 |
13.00 |
| 2026-02-16 12:00 |
20:54:16.14 |
-17:46:08.2 |
HIP 103226 |
11.93 |
| 2026-02-17 00:00 |
20:54:26.12 |
-17:45:17.6 |
HIP 103226 |
11.33 |
| 2026-02-17 12:00 |
20:54:36.07 |
-17:44:27.0 |
HIP 103226 |
11.27 |
| 2026-02-18 00:00 |
20:54:46.00 |
-17:43:36.5 |
HIP 103226 |
11.77 |
| 2026-02-18 12:00 |
20:54:55.90 |
-17:42:46.1 |
HIP 103226 |
12.75 |
| 2026-02-19 00:00 |
20:55:05.77 |
-17:41:55.7 |
HIP 103226 |
14.10 |
| 2026-02-19 12:00 |
20:55:15.61 |
-17:41:05.4 |
HIP 103226 |
15.73 |
| 2026-02-20 00:00 |
20:55:25.42 |
-17:40:15.2 |
HIP 103226 |
17.56 |
| 2026-02-20 12:00 |
20:55:35.19 |
-17:39:25.1 |
HIP 103226 |
19.53 |
| 2026-02-21 00:00 |
20:55:44.94 |
-17:38:35.1 |
HIP 103226 |
21.60 |
| 2026-02-21 12:00 |
20:55:54.65 |
-17:37:45.2 |
HIP 103338 |
23.43 |
| 2026-02-22 00:00 |
20:56:04.33 |
-17:36:55.3 |
HIP 103338 |
22.37 |
| 2026-02-22 12:00 |
20:56:13.97 |
-17:36:05.6 |
HIP 103338 |
21.53 |
| 2026-02-23 00:00 |
20:56:23.57 |
-17:35:16.0 |
HIP 103436 |
20.75 |
| 2026-02-23 12:00 |
20:56:33.14 |
-17:34:26.5 |
HIP 103436 |
19.95 |
| 2026-02-24 00:00 |
20:56:42.67 |
-17:33:37.1 |
HIP 103436 |
19.43 |