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
$$
M_a = (9.806 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
9.806 |
| n |
6.000 |
| gf |
0.997 |
| gb |
-0.500 |
| k |
0.800 |
| δ90 |
9.997 |
| 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) |
| 2026-03-26 00:00 |
12:49:30.91 |
+47:25:41.9 |
HIP 62628 |
18.47 |
| 2026-03-26 12:00 |
12:49:14.72 |
+47:26:41.1 |
HIP 62628 |
20.28 |
| 2026-03-27 00:00 |
12:48:58.49 |
+47:27:36.9 |
HIP 62628 |
22.27 |
| 2026-03-27 12:00 |
12:48:42.25 |
+47:28:29.3 |
HIP 62355 |
21.98 |
| 2026-03-28 00:00 |
12:48:26.00 |
+47:29:18.1 |
HIP 62355 |
19.63 |
| 2026-03-28 12:00 |
12:48:09.74 |
+47:30:03.5 |
HIP 62355 |
17.40 |
| 2026-03-29 00:00 |
12:47:53.47 |
+47:30:45.4 |
HIP 62355 |
15.36 |
| 2026-03-29 12:00 |
12:47:37.20 |
+47:31:23.9 |
HIP 62355 |
13.56 |
| 2026-03-30 00:00 |
12:47:20.94 |
+47:31:58.9 |
HIP 62355 |
12.12 |
| 2026-03-30 12:00 |
12:47:04.69 |
+47:32:30.4 |
HIP 62355 |
11.16 |
| 2026-03-31 00:00 |
12:46:48.45 |
+47:32:58.5 |
HIP 62355 |
10.80 |
| 2026-03-31 12:00 |
12:46:32.24 |
+47:33:23.1 |
HIP 62355 |
11.08 |
| 2026-04-01 00:00 |
12:46:16.04 |
+47:33:44.3 |
HIP 62355 |
11.96 |
| 2026-04-01 12:00 |
12:45:59.87 |
+47:34:02.0 |
HIP 62355 |
13.31 |
| 2026-04-02 00:00 |
12:45:43.73 |
+47:34:16.4 |
HIP 62355 |
15.00 |
| 2026-04-02 12:00 |
12:45:27.63 |
+47:34:27.2 |
HIP 62355 |
16.92 |
| 2026-04-03 00:00 |
12:45:11.58 |
+47:34:34.7 |
HIP 62355 |
18.99 |
| 2026-04-03 12:00 |
12:44:55.56 |
+47:34:38.7 |
HIP 62355 |
21.17 |
| 2026-04-04 00:00 |
12:44:39.59 |
+47:34:39.4 |
HIP 62355 |
23.42 |
| 2026-04-04 12:00 |
12:44:23.68 |
+47:34:36.6 |
HIP 62355 |
25.73 |
| 2026-04-05 00:00 |
12:44:07.83 |
+47:34:30.4 |
HIP 62355 |
28.07 |
| 2026-04-05 12:00 |
12:43:52.03 |
+47:34:20.9 |
HIP 61945 |
27.69 |
| 2026-04-06 00:00 |
12:43:36.31 |
+47:34:07.9 |
HIP 61945 |
25.82 |
| 2026-04-06 12:00 |
12:43:20.65 |
+47:33:51.6 |
HIP 61945 |
24.14 |
| 2026-04-07 00:00 |
12:43:05.06 |
+47:33:32.0 |
HIP 61945 |
22.70 |
| 2026-04-07 12:00 |
12:42:49.56 |
+47:33:09.0 |
HIP 61945 |
21.54 |
| 2026-04-08 00:00 |
12:42:34.14 |
+47:32:42.6 |
HIP 61945 |
20.71 |
| 2026-04-08 12:00 |
12:42:18.80 |
+47:32:12.9 |
HIP 61945 |
20.25 |
| 2026-04-09 00:00 |
12:42:03.55 |
+47:31:39.9 |
HIP 61945 |
20.19 |
| 2026-04-09 12:00 |
12:41:48.40 |
+47:31:03.6 |
HIP 61945 |
20.52 |
| 2026-04-10 00:00 |
12:41:33.35 |
+47:30:24.0 |
HIP 61945 |
21.22 |
| 2026-04-10 12:00 |
12:41:18.40 |
+47:29:41.1 |
HIP 61945 |
22.26 |
| 2026-04-11 00:00 |
12:41:03.55 |
+47:28:55.0 |
HIP 61713 |
22.86 |
| 2026-04-11 12:00 |
12:40:48.81 |
+47:28:05.6 |
HIP 61713 |
20.92 |
| 2026-04-12 00:00 |
12:40:34.19 |
+47:27:12.9 |
HIP 61713 |
19.18 |
| 2026-04-12 12:00 |
12:40:19.68 |
+47:26:17.0 |
HIP 61713 |
17.71 |
| 2026-04-13 00:00 |
12:40:05.30 |
+47:25:17.9 |
HIP 61713 |
16.57 |
| 2026-04-13 12:00 |
12:39:51.04 |
+47:24:15.6 |
HIP 61713 |
15.85 |
| 2026-04-14 00:00 |
12:39:36.91 |
+47:23:10.1 |
HIP 61713 |
15.60 |
| 2026-04-14 12:00 |
12:39:22.91 |
+47:22:01.4 |
HIP 61713 |
15.84 |
| 2026-04-15 00:00 |
12:39:09.04 |
+47:20:49.6 |
HIP 61713 |
16.56 |
| 2026-04-15 12:00 |
12:38:55.32 |
+47:19:34.6 |
HIP 61722 |
17.24 |
| 2026-04-16 00:00 |
12:38:41.73 |
+47:18:16.6 |
HIP 61722 |
16.33 |