メタデータ
| 項目 |
値 |
| Designation |
C/2025 M2 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2027-11-23T10:04:22.512000Z |
| Orbit solution date (soln_date, UTC) |
2026-05-08T13:42:11Z |
| Obs used |
233 |
| NEO |
- |
| M1 |
6.600 |
| 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) |
2025-10-10.0000000 |
| e |
1.00205237 |
| q (au) |
2.720306 |
| a (au) |
-1325.446719 |
| i (deg) |
173.214807 |
| Ω (om, deg) |
305.534547 |
| ω (w, deg) |
96.760694 |
| M (ma, deg) |
-0.015817 |
等級
散乱 + 全体線形
$$
M_a = (1.453 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
1.453 |
| n |
6.000 |
| gf |
0.900 |
| gb |
-0.862 |
| k |
1.000 |
| δ90 |
4.101 |
| 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
ファインディングチャート
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-05-12 00:00 |
21:02:54.88 |
-16:35:44.0 |
HIP 103762 |
21.23 |
| 2026-05-12 12:00 |
21:02:45.60 |
-16:36:07.3 |
HIP 103762 |
19.47 |
| 2026-05-13 00:00 |
21:02:36.11 |
-16:36:31.4 |
HIP 103762 |
17.79 |
| 2026-05-13 12:00 |
21:02:26.40 |
-16:36:56.3 |
HIP 103762 |
16.23 |
| 2026-05-14 00:00 |
21:02:16.47 |
-16:37:22.0 |
HIP 103762 |
14.86 |
| 2026-05-14 12:00 |
21:02:06.33 |
-16:37:48.5 |
HIP 103762 |
13.77 |
| 2026-05-15 00:00 |
21:01:55.96 |
-16:38:15.9 |
HIP 103762 |
13.05 |
| 2026-05-15 12:00 |
21:01:45.38 |
-16:38:44.0 |
HIP 103762 |
12.80 |
| 2026-05-16 00:00 |
21:01:34.57 |
-16:39:13.1 |
HIP 103762 |
13.08 |
| 2026-05-16 12:00 |
21:01:23.54 |
-16:39:42.9 |
HIP 103762 |
13.89 |
| 2026-05-17 00:00 |
21:01:12.29 |
-16:40:13.6 |
HIP 103762 |
15.18 |
| 2026-05-17 12:00 |
21:01:00.81 |
-16:40:45.2 |
HIP 103762 |
16.86 |
| 2026-05-18 00:00 |
21:00:49.11 |
-16:41:17.5 |
HIP 103762 |
18.85 |
| 2026-05-18 12:00 |
21:00:37.17 |
-16:41:50.7 |
HIP 103601 |
19.90 |
| 2026-05-19 00:00 |
21:00:25.01 |
-16:42:24.8 |
HIP 103601 |
17.20 |
| 2026-05-19 12:00 |
21:00:12.62 |
-16:42:59.7 |
HIP 103601 |
14.54 |
| 2026-05-20 00:00 |
21:00:00.00 |
-16:43:35.5 |
HIP 103601 |
12.01 |
| 2026-05-20 12:00 |
20:59:47.15 |
-16:44:12.1 |
HIP 103601 |
9.76 |
| 2026-05-21 00:00 |
20:59:34.07 |
-16:44:49.5 |
HIP 103601 |
8.10 |
| 2026-05-21 12:00 |
20:59:20.76 |
-16:45:27.8 |
HIP 103601 |
7.50 |
| 2026-05-22 00:00 |
20:59:07.21 |
-16:46:06.9 |
HIP 103601 |
8.27 |
| 2026-05-22 12:00 |
20:58:53.43 |
-16:46:46.9 |
HIP 103601 |
10.15 |
| 2026-05-23 00:00 |
20:58:39.41 |
-16:47:27.7 |
HIP 103601 |
12.71 |
| 2026-05-23 12:00 |
20:58:25.15 |
-16:48:09.4 |
HIP 103521 |
12.90 |
| 2026-05-24 00:00 |
20:58:10.66 |
-16:48:51.9 |
HIP 103521 |
12.43 |
| 2026-05-24 12:00 |
20:57:55.93 |
-16:49:35.2 |
HIP 103521 |
12.95 |
| 2026-05-25 00:00 |
20:57:40.97 |
-16:50:19.4 |
HIP 103521 |
14.42 |
| 2026-05-25 12:00 |
20:57:25.76 |
-16:51:04.5 |
HIP 103521 |
16.61 |
| 2026-05-26 00:00 |
20:57:10.32 |
-16:51:50.4 |
HIP 103521 |
19.31 |
| 2026-05-26 12:00 |
20:56:54.63 |
-16:52:37.1 |
HIP 103311 |
21.42 |
| 2026-05-27 00:00 |
20:56:38.70 |
-16:53:24.7 |
HIP 103311 |
18.15 |
| 2026-05-27 12:00 |
20:56:22.53 |
-16:54:13.1 |
HIP 103311 |
15.13 |
| 2026-05-28 00:00 |
20:56:06.12 |
-16:55:02.3 |
HIP 103311 |
12.60 |
| 2026-05-28 12:00 |
20:55:49.46 |
-16:55:52.4 |
HIP 103311 |
10.98 |
| 2026-05-29 00:00 |
20:55:32.56 |
-16:56:43.3 |
HIP 103311 |
10.74 |
| 2026-05-29 12:00 |
20:55:15.41 |
-16:57:35.1 |
HIP 103311 |
12.04 |
| 2026-05-30 00:00 |
20:54:58.02 |
-16:58:27.6 |
HIP 103311 |
14.52 |
| 2026-05-30 12:00 |
20:54:40.38 |
-16:59:21.1 |
HIP 103311 |
17.74 |
| 2026-05-31 00:00 |
20:54:22.49 |
-17:00:15.3 |
HIP 103311 |
21.39 |
| 2026-05-31 12:00 |
20:54:04.35 |
-17:01:10.4 |
HIP 103039 |
21.96 |
| 2026-06-01 00:00 |
20:53:45.97 |
-17:02:06.3 |
HIP 103039 |
17.77 |
| 2026-06-01 12:00 |
20:53:27.34 |
-17:03:03.0 |
HIP 103039 |
13.72 |
| 2026-06-02 00:00 |
20:53:08.45 |
-17:04:00.5 |
HIP 103039 |
10.07 |