C/2025 E1 (PANSTARRS)
メタデータ
| 項目 |
値 |
| Designation |
C/2025 E1 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2026-09-23T18:06:58.841280Z |
| Orbit solution date (soln_date, UTC) |
2026-01-13T08:12:19Z |
| Obs used |
45 |
| NEO |
- |
| M1 |
5.400 |
| K1 |
14.750 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2025-03-02T10:18:16.963200Z |
| Discovery magnitude (MPC) |
20.69 w |
| Discovery observatory (MPC) |
F51 · Pan-STARRS 1, Haleakala |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2025-05-18.0000000 |
| e |
0.99717735 |
| q (au) |
3.998242 |
| a (au) |
1416.486240 |
| i (deg) |
69.066456 |
| Ω (om, deg) |
344.597434 |
| ω (w, deg) |
274.420592 |
| M (ma, deg) |
359.990872 |
等級
散乱 + 全体線形
$$
M_a = (4.520 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
4.520 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-1.000 |
| 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 |
11:43:06.58 |
-61:25:49.5 |
HIP 57316 |
15.15 |
| 2026-02-03 12:00 |
11:42:32.08 |
-61:33:38.8 |
HIP 57316 |
18.49 |
| 2026-02-04 00:00 |
11:41:56.89 |
-61:41:26.0 |
HIP 57316 |
24.74 |
| 2026-02-04 12:00 |
11:41:21.01 |
-61:49:10.9 |
HIP 56986 |
16.54 |
| 2026-02-05 00:00 |
11:40:44.42 |
-61:56:53.5 |
HIP 56986 |
8.58 |
| 2026-02-05 12:00 |
11:40:07.12 |
-62:04:33.8 |
HIP 56986 |
5.51 |
| 2026-02-06 00:00 |
11:39:29.11 |
-62:12:11.6 |
HIP 56943 |
6.69 |
| 2026-02-06 12:00 |
11:38:50.38 |
-62:19:47.0 |
HIP 56723 |
11.03 |
| 2026-02-07 00:00 |
11:38:10.93 |
-62:27:19.9 |
HIP 56723 |
2.77 |
| 2026-02-07 12:00 |
11:37:30.76 |
-62:34:50.2 |
HIP 56660 |
6.49 |
| 2026-02-08 00:00 |
11:36:49.85 |
-62:42:17.8 |
HIP 56660 |
13.27 |
| 2026-02-08 12:00 |
11:36:08.21 |
-62:49:42.7 |
HIP 56561 |
11.73 |
| 2026-02-09 00:00 |
11:35:25.83 |
-62:57:04.8 |
HIP 56561 |
4.76 |
| 2026-02-09 12:00 |
11:34:42.71 |
-63:04:24.2 |
HIP 56561 |
7.96 |
| 2026-02-10 00:00 |
11:33:58.84 |
-63:11:40.6 |
HIP 56561 |
16.11 |
| 2026-02-10 12:00 |
11:33:14.22 |
-63:18:54.0 |
HIP 56331 |
20.04 |
| 2026-02-11 00:00 |
11:32:28.85 |
-63:26:04.5 |
HIP 56331 |
13.02 |
| 2026-02-11 12:00 |
11:31:42.72 |
-63:33:11.8 |
HIP 56331 |
9.65 |
| 2026-02-12 00:00 |
11:30:55.84 |
-63:40:16.0 |
HIP 56134 |
9.43 |
| 2026-02-12 12:00 |
11:30:08.19 |
-63:47:17.0 |
HIP 56134 |
2.50 |
| 2026-02-13 00:00 |
11:29:19.79 |
-63:54:14.8 |
HIP 56134 |
8.81 |
| 2026-02-13 12:00 |
11:28:30.61 |
-64:01:09.2 |
HIP 56138 |
15.91 |
| 2026-02-14 00:00 |
11:27:40.68 |
-64:08:00.1 |
HIP 55779 |
16.05 |
| 2026-02-14 12:00 |
11:26:49.97 |
-64:14:47.7 |
HIP 55779 |
17.98 |
| 2026-02-15 00:00 |
11:25:58.50 |
-64:21:31.6 |
HIP 55779 |
23.25 |
| 2026-02-15 12:00 |
11:25:06.26 |
-64:28:12.0 |
HIP 55779 |
30.14 |
| 2026-02-16 00:00 |
11:24:13.25 |
-64:34:48.8 |
HIP 55597 |
23.14 |
| 2026-02-16 12:00 |
11:23:19.47 |
-64:41:21.8 |
HIP 55597 |
15.92 |
| 2026-02-17 00:00 |
11:22:24.92 |
-64:47:51.0 |
HIP 55597 |
11.18 |
| 2026-02-17 12:00 |
11:21:29.61 |
-64:54:16.3 |
HIP 55597 |
12.22 |
| 2026-02-18 00:00 |
11:20:33.53 |
-65:00:37.8 |
HIP 55273 |
8.84 |
| 2026-02-18 12:00 |
11:19:36.69 |
-65:06:55.2 |
HIP 55273 |
4.70 |
| 2026-02-19 00:00 |
11:18:39.08 |
-65:13:08.7 |
HIP 55355 |
9.34 |
| 2026-02-19 12:00 |
11:17:40.72 |
-65:19:18.0 |
HIP 55355 |
15.77 |
| 2026-02-20 00:00 |
11:16:41.60 |
-65:25:23.1 |
HIP 55355 |
23.69 |
| 2026-02-20 12:00 |
11:15:41.72 |
-65:31:24.0 |
HIP 55037 |
18.36 |
| 2026-02-21 00:00 |
11:14:41.10 |
-65:37:20.7 |
HIP 55037 |
14.73 |
| 2026-02-21 12:00 |
11:13:39.72 |
-65:43:13.0 |
HIP 54885 |
10.98 |
| 2026-02-22 00:00 |
11:12:37.61 |
-65:49:00.8 |
HIP 54885 |
11.20 |
| 2026-02-22 12:00 |
11:11:34.76 |
-65:54:44.3 |
HIP 54885 |
16.71 |
| 2026-02-23 00:00 |
11:10:31.19 |
-66:00:23.2 |
HIP 54885 |
24.12 |
| 2026-02-23 12:00 |
11:09:26.88 |
-66:05:57.5 |
HIP 54885 |
32.13 |
| 2026-02-24 00:00 |
11:08:21.86 |
-66:11:27.2 |
HIP 54000 |
33.63 |