C/2025 X1 (PANSTARRS)
メタデータ
| 項目 |
値 |
| Designation |
C/2025 X1 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2026-12-10T23:27:44.112960Z |
| Orbit solution date (soln_date, UTC) |
2026-01-13T08:12:19Z |
| Obs used |
95 |
| NEO |
- |
| M1 |
10.000 |
| K1 |
10.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2025-12-12T15:00:50.889600Z |
| Discovery magnitude (MPC) |
21.04 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) |
2025-12-23.0000000 |
| e |
0.86229494 |
| q (au) |
4.668319 |
| a (au) |
33.900853 |
| i (deg) |
36.956671 |
| Ω (om, deg) |
95.637402 |
| ω (w, deg) |
85.647759 |
| M (ma, deg) |
358.237475 |
等級
散乱 + 全体線形
$$
M_a = (12.669 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
12.669 |
| n |
2.000 |
| gf |
0.998 |
| gb |
-0.968 |
| 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 |
10:10:29.38 |
+45:37:42.3 |
HIP 49734 |
19.22 |
| 2026-02-03 12:00 |
10:10:16.42 |
+45:41:01.6 |
HIP 49734 |
15.30 |
| 2026-02-04 00:00 |
10:10:03.33 |
+45:44:19.4 |
HIP 49734 |
11.45 |
| 2026-02-04 12:00 |
10:09:50.13 |
+45:47:35.5 |
HIP 49734 |
7.77 |
| 2026-02-05 00:00 |
10:09:36.80 |
+45:50:50.1 |
HIP 49734 |
4.63 |
| 2026-02-05 12:00 |
10:09:23.36 |
+45:54:02.9 |
HIP 49734 |
3.76 |
| 2026-02-06 00:00 |
10:09:09.80 |
+45:57:14.1 |
HIP 49734 |
6.17 |
| 2026-02-06 12:00 |
10:08:56.13 |
+46:00:23.5 |
HIP 49734 |
9.64 |
| 2026-02-07 00:00 |
10:08:42.36 |
+46:03:31.2 |
HIP 49634 |
9.48 |
| 2026-02-07 12:00 |
10:08:28.48 |
+46:06:37.1 |
HIP 49634 |
8.40 |
| 2026-02-08 00:00 |
10:08:14.50 |
+46:09:41.2 |
HIP 49634 |
9.02 |
| 2026-02-08 12:00 |
10:08:00.42 |
+46:12:43.6 |
HIP 49576 |
9.97 |
| 2026-02-09 00:00 |
10:07:46.25 |
+46:15:44.0 |
HIP 49576 |
10.48 |
| 2026-02-09 12:00 |
10:07:31.99 |
+46:18:42.6 |
HIP 49576 |
12.23 |
| 2026-02-10 00:00 |
10:07:17.64 |
+46:21:39.4 |
HIP 49576 |
14.77 |
| 2026-02-10 12:00 |
10:07:03.21 |
+46:24:34.2 |
HIP 49576 |
17.76 |
| 2026-02-11 00:00 |
10:06:48.70 |
+46:27:27.0 |
HIP 49576 |
21.00 |
| 2026-02-11 12:00 |
10:06:34.12 |
+46:30:18.0 |
HIP 49576 |
24.37 |
| 2026-02-12 00:00 |
10:06:19.46 |
+46:33:06.9 |
HIP 49576 |
27.83 |
| 2026-02-12 12:00 |
10:06:04.74 |
+46:35:53.8 |
HIP 49576 |
31.34 |
| 2026-02-13 00:00 |
10:05:49.95 |
+46:38:38.7 |
HIP 49576 |
34.87 |
| 2026-02-13 12:00 |
10:05:35.10 |
+46:41:21.6 |
HIP 49266 |
34.56 |
| 2026-02-14 00:00 |
10:05:20.19 |
+46:44:02.4 |
HIP 49266 |
30.87 |
| 2026-02-14 12:00 |
10:05:05.23 |
+46:46:41.1 |
HIP 49266 |
27.20 |
| 2026-02-15 00:00 |
10:04:50.23 |
+46:49:17.6 |
HIP 49266 |
23.55 |
| 2026-02-15 12:00 |
10:04:35.18 |
+46:51:52.1 |
HIP 49266 |
19.94 |
| 2026-02-16 00:00 |
10:04:20.09 |
+46:54:24.4 |
HIP 49266 |
16.37 |
| 2026-02-16 12:00 |
10:04:04.96 |
+46:56:54.6 |
HIP 49266 |
12.84 |
| 2026-02-17 00:00 |
10:03:49.80 |
+46:59:22.6 |
HIP 49266 |
9.41 |
| 2026-02-17 12:00 |
10:03:34.61 |
+47:01:48.4 |
HIP 49266 |
6.16 |
| 2026-02-18 00:00 |
10:03:19.40 |
+47:04:11.9 |
HIP 49266 |
3.59 |
| 2026-02-18 12:00 |
10:03:04.17 |
+47:06:33.3 |
HIP 49266 |
3.58 |
| 2026-02-19 00:00 |
10:02:48.93 |
+47:08:52.3 |
HIP 49266 |
6.10 |
| 2026-02-19 12:00 |
10:02:33.67 |
+47:11:09.2 |
HIP 49266 |
9.24 |
| 2026-02-20 00:00 |
10:02:18.41 |
+47:13:23.7 |
HIP 49174 |
9.06 |
| 2026-02-20 12:00 |
10:02:03.15 |
+47:15:36.0 |
HIP 49174 |
6.74 |
| 2026-02-21 00:00 |
10:01:47.89 |
+47:17:46.0 |
HIP 49174 |
5.67 |
| 2026-02-21 12:00 |
10:01:32.63 |
+47:19:53.6 |
HIP 49174 |
6.47 |
| 2026-02-22 00:00 |
10:01:17.39 |
+47:21:59.0 |
HIP 49174 |
8.59 |
| 2026-02-22 12:00 |
10:01:02.16 |
+47:24:02.0 |
HIP 49174 |
11.30 |
| 2026-02-23 00:00 |
10:00:46.95 |
+47:26:02.7 |
HIP 49174 |
14.23 |
| 2026-02-23 12:00 |
10:00:31.76 |
+47:28:01.0 |
HIP 49174 |
17.27 |
| 2026-02-24 00:00 |
10:00:16.60 |
+47:29:56.9 |
HIP 49174 |
20.35 |