メタデータ
| 項目 |
値 |
| Designation |
C/2025 M1 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2029-08-03T09:20:42.449280Z |
| Orbit solution date (soln_date, UTC) |
2026-07-16T19:12:19Z |
| Obs used |
80 |
| NEO |
- |
| M1 |
6.600 |
| 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) |
2025-03-25.0000000 |
| e |
0.99825526 |
| q (au) |
10.828162 |
| a (au) |
6206.164211 |
| i (deg) |
64.904222 |
| Ω (om, deg) |
66.958465 |
| ω (w, deg) |
230.435853 |
| M (ma, deg) |
359.996790 |
等級
散乱 + 全体線形
$$
M_a = (5.650 + 5.538\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
5.650 |
| n |
5.538 |
| gf |
1.000 |
| gb |
-0.914 |
| k |
0.800 |
| δ90 |
9.989 |
| 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) |
| 2026-07-29 00:00 |
16:14:55.67 |
-31:39:37.6 |
HIP 79578 |
9.30 |
| 2026-07-29 12:00 |
16:14:51.02 |
-31:39:57.1 |
HIP 79578 |
8.31 |
| 2026-07-30 00:00 |
16:14:46.45 |
-31:40:16.7 |
HIP 79578 |
7.35 |
| 2026-07-30 12:00 |
16:14:41.97 |
-31:40:36.3 |
HIP 79578 |
6.43 |
| 2026-07-31 00:00 |
16:14:37.58 |
-31:40:56.0 |
HIP 79578 |
5.56 |
| 2026-07-31 12:00 |
16:14:33.27 |
-31:41:15.7 |
HIP 79578 |
4.76 |
| 2026-08-01 00:00 |
16:14:29.06 |
-31:41:35.5 |
HIP 79578 |
4.06 |
| 2026-08-01 12:00 |
16:14:24.94 |
-31:41:55.4 |
HIP 79578 |
3.49 |
| 2026-08-02 00:00 |
16:14:20.91 |
-31:42:15.3 |
HIP 79578 |
3.12 |
| 2026-08-02 12:00 |
16:14:16.97 |
-31:42:35.3 |
HIP 79578 |
3.00 |
| 2026-08-03 00:00 |
16:14:13.12 |
-31:42:55.3 |
HIP 79578 |
3.15 |
| 2026-08-03 12:00 |
16:14:09.36 |
-31:43:15.4 |
HIP 79578 |
3.52 |
| 2026-08-04 00:00 |
16:14:05.69 |
-31:43:35.6 |
HIP 79578 |
4.04 |
| 2026-08-04 12:00 |
16:14:02.12 |
-31:43:55.9 |
HIP 79578 |
4.65 |
| 2026-08-05 00:00 |
16:13:58.63 |
-31:44:16.3 |
HIP 79578 |
5.31 |
| 2026-08-05 12:00 |
16:13:55.24 |
-31:44:36.7 |
HIP 79578 |
6.00 |
| 2026-08-06 00:00 |
16:13:51.94 |
-31:44:57.2 |
HIP 79578 |
6.70 |
| 2026-08-06 12:00 |
16:13:48.74 |
-31:45:17.8 |
HIP 79578 |
7.41 |
| 2026-08-07 00:00 |
16:13:45.62 |
-31:45:38.5 |
HIP 79578 |
8.11 |
| 2026-08-07 12:00 |
16:13:42.60 |
-31:45:59.3 |
HIP 79578 |
8.81 |
| 2026-08-08 00:00 |
16:13:39.68 |
-31:46:20.2 |
HIP 79578 |
9.50 |
| 2026-08-08 12:00 |
16:13:36.85 |
-31:46:41.2 |
HIP 79578 |
10.17 |
| 2026-08-09 00:00 |
16:13:34.11 |
-31:47:02.3 |
HIP 79578 |
10.84 |
| 2026-08-09 12:00 |
16:13:31.47 |
-31:47:23.5 |
HIP 79578 |
11.50 |
| 2026-08-10 00:00 |
16:13:28.92 |
-31:47:44.8 |
HIP 79578 |
12.14 |
| 2026-08-10 12:00 |
16:13:26.46 |
-31:48:06.2 |
HIP 79578 |
12.76 |
| 2026-08-11 00:00 |
16:13:24.10 |
-31:48:27.7 |
HIP 79578 |
13.38 |
| 2026-08-11 12:00 |
16:13:21.84 |
-31:48:49.4 |
HIP 79578 |
13.98 |
| 2026-08-12 00:00 |
16:13:19.67 |
-31:49:11.1 |
HIP 79578 |
14.56 |
| 2026-08-12 12:00 |
16:13:17.60 |
-31:49:33.0 |
HIP 79578 |
15.14 |
| 2026-08-13 00:00 |
16:13:15.62 |
-31:49:55.0 |
HIP 79578 |
15.69 |
| 2026-08-13 12:00 |
16:13:13.74 |
-31:50:17.1 |
HIP 79578 |
16.24 |
| 2026-08-14 00:00 |
16:13:11.95 |
-31:50:39.4 |
HIP 79578 |
16.77 |
| 2026-08-14 12:00 |
16:13:10.27 |
-31:51:01.8 |
HIP 79496 |
16.97 |
| 2026-08-15 00:00 |
16:13:08.67 |
-31:51:24.3 |
HIP 79496 |
16.65 |
| 2026-08-15 12:00 |
16:13:07.17 |
-31:51:46.9 |
HIP 79496 |
16.34 |
| 2026-08-16 00:00 |
16:13:05.77 |
-31:52:09.7 |
HIP 79496 |
16.03 |
| 2026-08-16 12:00 |
16:13:04.47 |
-31:52:32.6 |
HIP 79496 |
15.72 |
| 2026-08-17 00:00 |
16:13:03.26 |
-31:52:55.7 |
HIP 79496 |
15.42 |
| 2026-08-17 12:00 |
16:13:02.14 |
-31:53:18.9 |
HIP 79496 |
15.11 |
| 2026-08-18 00:00 |
16:13:01.13 |
-31:53:42.2 |
HIP 79496 |
14.80 |
| 2026-08-18 12:00 |
16:13:00.21 |
-31:54:05.7 |
HIP 79496 |
14.49 |
| 2026-08-19 00:00 |
16:12:59.38 |
-31:54:29.4 |
HIP 79496 |
14.18 |