メタデータ
| 項目 |
値 |
| Designation |
C/2025 B1 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2025-06-26T18:23:26.652480Z |
| Orbit solution date (soln_date, UTC) |
2026-03-07T14:43:13Z |
| Obs used |
50 |
| NEO |
- |
| M1 |
11.800 |
| K1 |
10.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2025-01-20T05:46:10.819200Z |
| Discovery magnitude (MPC) |
20.72 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) |
2025-01-22.0000000 |
| e |
1.00271821 |
| q (au) |
3.529741 |
| a (au) |
-1298.553960 |
| i (deg) |
39.649466 |
| Ω (om, deg) |
102.844475 |
| ω (w, deg) |
23.544686 |
| M (ma, deg) |
-0.003281 |
等級
散乱 + 全体線形
$$
M_a = (10.716 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
10.716 |
| n |
6.000 |
| gf |
0.999 |
| gb |
-0.622 |
| k |
0.800 |
| 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) |
| 2026-09-25 00:00 |
13:51:28.32 |
+24:55:36.7 |
HIP 67679 |
8.80 |
| 2026-09-25 12:00 |
13:51:56.15 |
+24:52:07.2 |
HIP 67679 |
10.08 |
| 2026-09-26 00:00 |
13:52:23.99 |
+24:48:38.7 |
HIP 67668 |
10.76 |
| 2026-09-26 12:00 |
13:52:51.84 |
+24:45:11.2 |
HIP 67668 |
14.71 |
| 2026-09-27 00:00 |
13:53:19.71 |
+24:41:44.6 |
HIP 67668 |
20.52 |
| 2026-09-27 12:00 |
13:53:47.59 |
+24:38:18.9 |
HIP 67668 |
27.02 |
| 2026-09-28 00:00 |
13:54:15.47 |
+24:34:54.2 |
HIP 68045 |
23.10 |
| 2026-09-28 12:00 |
13:54:43.37 |
+24:31:30.4 |
HIP 68045 |
16.56 |
| 2026-09-29 00:00 |
13:55:11.28 |
+24:28:07.6 |
HIP 68045 |
10.87 |
| 2026-09-29 12:00 |
13:55:39.20 |
+24:24:45.8 |
HIP 68045 |
8.08 |
| 2026-09-30 00:00 |
13:56:07.12 |
+24:21:24.9 |
HIP 68045 |
10.74 |
| 2026-09-30 12:00 |
13:56:35.06 |
+24:18:05.0 |
HIP 68045 |
16.38 |
| 2026-10-01 00:00 |
13:57:03.00 |
+24:14:46.0 |
HIP 68045 |
22.88 |
| 2026-10-01 12:00 |
13:57:30.96 |
+24:11:28.1 |
HIP 68243 |
17.59 |
| 2026-10-02 00:00 |
13:57:58.92 |
+24:08:11.1 |
HIP 68243 |
11.80 |
| 2026-10-02 12:00 |
13:58:26.88 |
+24:04:55.1 |
HIP 68243 |
8.52 |
| 2026-10-03 00:00 |
13:58:54.86 |
+24:01:40.1 |
HIP 68243 |
10.44 |
| 2026-10-03 12:00 |
13:59:22.84 |
+23:58:26.1 |
HIP 68243 |
15.76 |
| 2026-10-04 00:00 |
13:59:50.82 |
+23:55:13.1 |
HIP 68243 |
22.15 |
| 2026-10-04 12:00 |
14:00:18.81 |
+23:52:01.1 |
HIP 68346 |
28.67 |
| 2026-10-05 00:00 |
14:00:46.81 |
+23:48:50.1 |
HIP 68346 |
34.54 |
| 2026-10-05 12:00 |
14:01:14.81 |
+23:45:40.1 |
HIP 68510 |
33.48 |
| 2026-10-06 00:00 |
14:01:42.82 |
+23:42:31.2 |
HIP 68510 |
30.34 |
| 2026-10-06 12:00 |
14:02:10.82 |
+23:39:23.3 |
HIP 68510 |
28.70 |
| 2026-10-07 00:00 |
14:02:38.83 |
+23:36:16.3 |
HIP 68510 |
28.80 |
| 2026-10-07 12:00 |
14:03:06.85 |
+23:33:10.5 |
HIP 68510 |
30.63 |
| 2026-10-08 00:00 |
14:03:34.86 |
+23:30:05.6 |
HIP 68751 |
25.90 |
| 2026-10-08 12:00 |
14:04:02.88 |
+23:27:01.8 |
HIP 68751 |
20.96 |
| 2026-10-09 00:00 |
14:04:30.89 |
+23:23:59.1 |
HIP 68751 |
17.61 |
| 2026-10-09 12:00 |
14:04:58.91 |
+23:20:57.4 |
HIP 68751 |
16.81 |
| 2026-10-10 00:00 |
14:05:26.92 |
+23:17:56.8 |
HIP 68890 |
12.96 |
| 2026-10-10 12:00 |
14:05:54.94 |
+23:14:57.2 |
HIP 68890 |
9.93 |
| 2026-10-11 00:00 |
14:06:22.95 |
+23:11:58.7 |
HIP 68890 |
11.38 |
| 2026-10-11 12:00 |
14:06:50.96 |
+23:09:01.3 |
HIP 68971 |
5.29 |
| 2026-10-12 00:00 |
14:07:18.96 |
+23:06:04.9 |
HIP 68971 |
3.08 |
| 2026-10-12 12:00 |
14:07:46.96 |
+23:03:09.7 |
HIP 68971 |
9.54 |
| 2026-10-13 00:00 |
14:08:14.96 |
+23:00:15.5 |
HIP 68971 |
16.50 |
| 2026-10-13 12:00 |
14:08:42.95 |
+22:57:22.4 |
HIP 69181 |
17.74 |
| 2026-10-14 00:00 |
14:09:10.94 |
+22:54:30.4 |
HIP 69181 |
16.24 |
| 2026-10-14 12:00 |
14:09:38.92 |
+22:51:39.4 |
HIP 69181 |
17.63 |
| 2026-10-15 00:00 |
14:10:06.89 |
+22:48:49.6 |
HIP 69318 |
17.52 |
| 2026-10-15 12:00 |
14:10:34.85 |
+22:46:00.9 |
HIP 69318 |
10.49 |
| 2026-10-16 00:00 |
14:11:02.81 |
+22:43:13.3 |
HIP 69318 |
3.49 |