メタデータ
| 項目 |
値 |
| Designation |
P/2025 W4 (PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2025-10-04T11:24:31.605120Z |
| Orbit solution date (soln_date, UTC) |
2026-03-11T21:13:02Z |
| Obs used |
104 |
| NEO |
- |
| M1 |
17.300 |
| K1 |
10.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2025-11-23T12:20:09.600000Z |
| Discovery magnitude (MPC) |
20.65 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) |
2025-12-01.0000000 |
| e |
0.21117858 |
| q (au) |
2.034369 |
| a (au) |
2.578999 |
| i (deg) |
1.298188 |
| Ω (om, deg) |
237.120950 |
| ω (w, deg) |
172.279158 |
| M (ma, deg) |
13.689301 |
等級
散乱 + 全体線形
$$
M_a = (20.000 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
20.000 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.654 |
| k |
0.914 |
| 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
ファインディングチャート
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-03-26 00:00 |
05:33:22.96 |
+22:14:53.4 |
HIP 26187 |
28.85 |
| 2026-03-26 12:00 |
05:34:13.03 |
+22:15:27.0 |
HIP 26240 |
20.03 |
| 2026-03-27 00:00 |
05:35:03.25 |
+22:15:59.7 |
HIP 26240 |
11.55 |
| 2026-03-27 12:00 |
05:35:53.62 |
+22:16:31.5 |
HIP 26240 |
11.68 |
| 2026-03-28 00:00 |
05:36:44.12 |
+22:17:02.3 |
HIP 26389 |
11.17 |
| 2026-03-28 12:00 |
05:37:34.77 |
+22:17:32.2 |
HIP 26484 |
11.73 |
| 2026-03-29 00:00 |
05:38:25.55 |
+22:18:01.1 |
HIP 26484 |
11.71 |
| 2026-03-29 12:00 |
05:39:16.47 |
+22:18:29.1 |
HIP 26484 |
20.35 |
| 2026-03-30 00:00 |
05:40:07.53 |
+22:18:56.1 |
HIP 26484 |
31.15 |
| 2026-03-30 12:00 |
05:40:58.71 |
+22:19:22.2 |
HIP 26853 |
25.25 |
| 2026-03-31 00:00 |
05:41:50.03 |
+22:19:47.2 |
HIP 26853 |
20.10 |
| 2026-03-31 12:00 |
05:42:41.47 |
+22:20:11.2 |
HIP 26944 |
20.90 |
| 2026-04-01 00:00 |
05:43:33.04 |
+22:20:34.3 |
HIP 26944 |
21.22 |
| 2026-04-01 12:00 |
05:44:24.74 |
+22:20:56.3 |
HIP 27098 |
24.80 |
| 2026-04-02 00:00 |
05:45:16.56 |
+22:21:17.3 |
HIP 27098 |
25.67 |
| 2026-04-02 12:00 |
05:46:08.50 |
+22:21:37.3 |
HIP 27320 |
18.40 |
| 2026-04-03 00:00 |
05:47:00.56 |
+22:21:56.2 |
HIP 27320 |
10.36 |
| 2026-04-03 12:00 |
05:47:52.74 |
+22:22:14.1 |
HIP 27388 |
8.65 |
| 2026-04-04 00:00 |
05:48:45.04 |
+22:22:30.9 |
HIP 27388 |
12.95 |
| 2026-04-04 12:00 |
05:49:37.45 |
+22:22:46.7 |
HIP 27550 |
12.05 |
| 2026-04-05 00:00 |
05:50:29.98 |
+22:23:01.4 |
HIP 27627 |
9.61 |
| 2026-04-05 12:00 |
05:51:22.62 |
+22:23:15.0 |
HIP 27627 |
9.24 |
| 2026-04-06 00:00 |
05:52:15.37 |
+22:23:27.5 |
HIP 27627 |
19.38 |
| 2026-04-06 12:00 |
05:53:08.23 |
+22:23:39.0 |
HIP 27828 |
19.47 |
| 2026-04-07 00:00 |
05:54:01.20 |
+22:23:49.3 |
HIP 27956 |
14.25 |
| 2026-04-07 12:00 |
05:54:54.28 |
+22:23:58.6 |
HIP 27956 |
7.22 |
| 2026-04-08 00:00 |
05:55:47.46 |
+22:24:06.7 |
HIP 27956 |
14.24 |
| 2026-04-08 12:00 |
05:56:40.75 |
+22:24:13.7 |
HIP 28216 |
16.20 |
| 2026-04-09 00:00 |
05:57:34.14 |
+22:24:19.6 |
HIP 28216 |
7.85 |
| 2026-04-09 12:00 |
05:58:27.63 |
+22:24:24.3 |
HIP 28216 |
12.88 |
| 2026-04-10 00:00 |
05:59:21.22 |
+22:24:27.9 |
HIP 28355 |
10.54 |
| 2026-04-10 12:00 |
06:00:14.91 |
+22:24:30.4 |
HIP 28355 |
14.80 |
| 2026-04-11 00:00 |
06:01:08.70 |
+22:24:31.6 |
HIP 28561 |
7.62 |
| 2026-04-11 12:00 |
06:02:02.59 |
+22:24:31.8 |
HIP 28561 |
4.87 |
| 2026-04-12 00:00 |
06:02:56.57 |
+22:24:30.7 |
HIP 28625 |
11.44 |
| 2026-04-12 12:00 |
06:03:50.64 |
+22:24:28.5 |
HIP 28806 |
15.78 |
| 2026-04-13 00:00 |
06:04:44.81 |
+22:24:25.1 |
HIP 28806 |
6.06 |
| 2026-04-13 12:00 |
06:05:39.07 |
+22:24:20.5 |
HIP 28806 |
11.76 |
| 2026-04-14 00:00 |
06:06:33.42 |
+22:24:14.8 |
HIP 28806 |
23.56 |
| 2026-04-14 12:00 |
06:07:27.86 |
+22:24:07.8 |
HIP 29061 |
24.44 |
| 2026-04-15 00:00 |
06:08:22.38 |
+22:23:59.6 |
HIP 29196 |
20.51 |
| 2026-04-15 12:00 |
06:09:16.99 |
+22:23:50.2 |
HIP 29196 |
12.92 |
| 2026-04-16 00:00 |
06:10:11.69 |
+22:23:39.6 |
HIP 29296 |
12.67 |