メタデータ
| 項目 |
値 |
| Designation |
C/2025 X1 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2026-12-10T22:49:17.656320Z |
| Orbit solution date (soln_date, UTC) |
2026-05-28T12:12:16Z |
| Obs used |
143 |
| NEO |
- |
| M1 |
7.200 |
| K1 |
13.750 |
| 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) |
2026-01-14.0000000 |
| e |
0.86209784 |
| q (au) |
4.668706 |
| a (au) |
33.855203 |
| i (deg) |
36.957112 |
| Ω (om, deg) |
95.638037 |
| ω (w, deg) |
85.638703 |
| M (ma, deg) |
358.344118 |
等級
散乱 + 全体線形
$$
M_a = (5.369 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
5.369 |
| 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) |
| 2026-06-01 00:00 |
10:08:21.07 |
+43:41:29.5 |
HIP 49489 |
24.26 |
| 2026-06-01 12:00 |
10:08:44.23 |
+43:38:26.3 |
HIP 49795 |
21.61 |
| 2026-06-02 00:00 |
10:09:07.56 |
+43:35:22.6 |
HIP 49795 |
16.78 |
| 2026-06-02 12:00 |
10:09:31.05 |
+43:32:18.3 |
HIP 49795 |
12.25 |
| 2026-06-03 00:00 |
10:09:54.69 |
+43:29:13.6 |
HIP 49795 |
8.59 |
| 2026-06-03 12:00 |
10:10:18.48 |
+43:26:08.4 |
HIP 49795 |
7.32 |
| 2026-06-04 00:00 |
10:10:42.44 |
+43:23:02.6 |
HIP 49795 |
9.50 |
| 2026-06-04 12:00 |
10:11:06.54 |
+43:19:56.4 |
HIP 49795 |
13.60 |
| 2026-06-05 00:00 |
10:11:30.80 |
+43:16:49.7 |
HIP 49963 |
16.49 |
| 2026-06-05 12:00 |
10:11:55.21 |
+43:13:42.6 |
HIP 49963 |
18.63 |
| 2026-06-06 00:00 |
10:12:19.77 |
+43:10:34.9 |
HIP 50131 |
18.76 |
| 2026-06-06 12:00 |
10:12:44.48 |
+43:07:26.8 |
HIP 50131 |
15.17 |
| 2026-06-07 00:00 |
10:13:09.34 |
+43:04:18.2 |
HIP 50131 |
12.96 |
| 2026-06-07 12:00 |
10:13:34.34 |
+43:01:09.2 |
HIP 50131 |
12.91 |
| 2026-06-08 00:00 |
10:13:59.50 |
+42:57:59.7 |
HIP 50131 |
15.06 |
| 2026-06-08 12:00 |
10:14:24.79 |
+42:54:49.8 |
HIP 50131 |
18.69 |
| 2026-06-09 00:00 |
10:14:50.23 |
+42:51:39.4 |
HIP 50302 |
15.88 |
| 2026-06-09 12:00 |
10:15:15.81 |
+42:48:28.6 |
HIP 50302 |
10.74 |
| 2026-06-10 00:00 |
10:15:41.54 |
+42:45:17.4 |
HIP 50302 |
6.51 |
| 2026-06-10 12:00 |
10:16:07.41 |
+42:42:05.7 |
HIP 50302 |
5.85 |
| 2026-06-11 00:00 |
10:16:33.41 |
+42:38:53.6 |
HIP 50383 |
7.61 |
| 2026-06-11 12:00 |
10:16:59.56 |
+42:35:41.1 |
HIP 50383 |
3.72 |
| 2026-06-12 00:00 |
10:17:25.84 |
+42:32:28.2 |
HIP 50383 |
6.07 |
| 2026-06-12 12:00 |
10:17:52.26 |
+42:29:14.8 |
HIP 50383 |
11.30 |
| 2026-06-13 00:00 |
10:18:18.81 |
+42:26:01.1 |
HIP 50383 |
16.96 |
| 2026-06-13 12:00 |
10:18:45.50 |
+42:22:47.0 |
HIP 50383 |
22.75 |
| 2026-06-14 00:00 |
10:19:12.33 |
+42:19:32.4 |
HIP 50679 |
20.98 |
| 2026-06-14 12:00 |
10:19:39.28 |
+42:16:17.5 |
HIP 50679 |
15.16 |
| 2026-06-15 00:00 |
10:20:06.37 |
+42:13:02.2 |
HIP 50679 |
9.46 |
| 2026-06-15 12:00 |
10:20:33.59 |
+42:09:46.6 |
HIP 50679 |
4.51 |
| 2026-06-16 00:00 |
10:21:00.93 |
+42:06:30.6 |
HIP 50679 |
4.84 |
| 2026-06-16 12:00 |
10:21:28.41 |
+42:03:14.2 |
HIP 50679 |
9.98 |
| 2026-06-17 00:00 |
10:21:56.01 |
+41:59:57.5 |
HIP 50687 |
13.25 |
| 2026-06-17 12:00 |
10:22:23.73 |
+41:56:40.4 |
HIP 50687 |
15.96 |
| 2026-06-18 00:00 |
10:22:51.58 |
+41:53:23.0 |
HIP 50687 |
20.23 |
| 2026-06-18 12:00 |
10:23:19.55 |
+41:50:05.2 |
HIP 50801 |
23.01 |
| 2026-06-19 00:00 |
10:23:47.65 |
+41:46:47.1 |
HIP 50801 |
23.50 |
| 2026-06-19 12:00 |
10:24:15.86 |
+41:43:28.7 |
HIP 50801 |
25.56 |
| 2026-06-20 00:00 |
10:24:44.19 |
+41:40:10.0 |
HIP 50801 |
28.86 |
| 2026-06-20 12:00 |
10:25:12.65 |
+41:36:51.0 |
HIP 51200 |
25.33 |
| 2026-06-21 00:00 |
10:25:41.21 |
+41:33:31.6 |
HIP 51200 |
20.15 |
| 2026-06-21 12:00 |
10:26:09.90 |
+41:30:12.0 |
HIP 51200 |
15.76 |
| 2026-06-22 00:00 |
10:26:38.70 |
+41:26:52.0 |
HIP 51200 |
13.05 |