494P/PANSTARRS
メタデータ
| 項目 |
値 |
| Designation |
494P/PANSTARRS |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2024-05-31T00:08:54.064320Z |
| Orbit solution date (soln_date, UTC) |
2024-12-14T13:27:26Z |
| Obs used |
62 |
| NEO |
- |
| M1 |
15.900 |
| K1 |
10.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2010-10-08T09:52:34.550400Z |
| Discovery magnitude (MPC) |
23.38 G |
| 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) |
2023-05-16.0000000 |
| e |
0.35748875 |
| q (au) |
2.440228 |
| a (au) |
3.797954 |
| i (deg) |
7.788642 |
| Ω (om, deg) |
245.048909 |
| ω (w, deg) |
48.878232 |
| M (ma, deg) |
309.264539 |
等級
散乱 + 全体線形
$$
M_a = (16.901 + 5.392\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
16.901 |
| n |
5.392 |
| gf |
1.000 |
| gb |
-0.718 |
| 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) |
| 2026-02-03 00:00 |
02:34:35.85 |
+16:32:40.1 |
HIP 11920 |
10.70 |
| 2026-02-03 12:00 |
02:34:51.49 |
+16:33:15.9 |
HIP 12075 |
12.33 |
| 2026-02-04 00:00 |
02:35:07.31 |
+16:33:52.6 |
HIP 12075 |
8.53 |
| 2026-02-04 12:00 |
02:35:23.32 |
+16:34:30.3 |
HIP 12075 |
4.76 |
| 2026-02-05 00:00 |
02:35:39.51 |
+16:35:08.9 |
HIP 12075 |
1.64 |
| 2026-02-05 12:00 |
02:35:55.88 |
+16:35:48.5 |
HIP 12075 |
3.73 |
| 2026-02-06 00:00 |
02:36:12.43 |
+16:36:29.0 |
HIP 12075 |
7.58 |
| 2026-02-06 12:00 |
02:36:29.16 |
+16:37:10.4 |
HIP 12075 |
11.59 |
| 2026-02-07 00:00 |
02:36:46.06 |
+16:37:52.7 |
HIP 12230 |
15.32 |
| 2026-02-07 12:00 |
02:37:03.14 |
+16:38:35.9 |
HIP 12230 |
12.38 |
| 2026-02-08 00:00 |
02:37:20.39 |
+16:39:20.0 |
HIP 12230 |
10.30 |
| 2026-02-08 12:00 |
02:37:37.82 |
+16:40:04.9 |
HIP 12230 |
9.70 |
| 2026-02-09 00:00 |
02:37:55.42 |
+16:40:50.8 |
HIP 12230 |
10.87 |
| 2026-02-09 12:00 |
02:38:13.19 |
+16:41:37.5 |
HIP 12230 |
13.40 |
| 2026-02-10 00:00 |
02:38:31.13 |
+16:42:25.0 |
HIP 12230 |
16.72 |
| 2026-02-10 12:00 |
02:38:49.24 |
+16:43:13.4 |
HIP 12441 |
19.10 |
| 2026-02-11 00:00 |
02:39:07.51 |
+16:44:02.6 |
HIP 12441 |
14.73 |
| 2026-02-11 12:00 |
02:39:25.95 |
+16:44:52.6 |
HIP 12441 |
10.38 |
| 2026-02-12 00:00 |
02:39:44.56 |
+16:45:43.5 |
HIP 12441 |
6.22 |
| 2026-02-12 12:00 |
02:40:03.33 |
+16:46:35.2 |
HIP 12441 |
3.26 |
| 2026-02-13 00:00 |
02:40:22.27 |
+16:47:27.6 |
HIP 12441 |
4.98 |
| 2026-02-13 12:00 |
02:40:41.37 |
+16:48:20.8 |
HIP 12441 |
9.08 |
| 2026-02-14 00:00 |
02:41:00.62 |
+16:49:14.9 |
HIP 12568 |
10.27 |
| 2026-02-14 12:00 |
02:41:20.04 |
+16:50:09.6 |
HIP 12568 |
7.36 |
| 2026-02-15 00:00 |
02:41:39.62 |
+16:51:05.2 |
HIP 12568 |
6.93 |
| 2026-02-15 12:00 |
02:41:59.35 |
+16:52:01.5 |
HIP 12634 |
7.46 |
| 2026-02-16 00:00 |
02:42:19.24 |
+16:52:58.5 |
HIP 12634 |
4.58 |
| 2026-02-16 12:00 |
02:42:39.28 |
+16:53:56.2 |
HIP 12634 |
5.79 |
| 2026-02-17 00:00 |
02:42:59.48 |
+16:54:54.7 |
HIP 12634 |
9.72 |
| 2026-02-17 12:00 |
02:43:19.83 |
+16:55:53.9 |
HIP 12634 |
14.32 |
| 2026-02-18 00:00 |
02:43:40.34 |
+16:56:53.8 |
HIP 12634 |
19.14 |
| 2026-02-18 12:00 |
02:44:00.99 |
+16:57:54.4 |
HIP 12634 |
24.07 |
| 2026-02-19 00:00 |
02:44:21.79 |
+16:58:55.6 |
HIP 12893 |
19.57 |
| 2026-02-19 12:00 |
02:44:42.74 |
+16:59:57.5 |
HIP 12893 |
14.48 |
| 2026-02-20 00:00 |
02:45:03.84 |
+17:01:00.1 |
HIP 12893 |
9.38 |
| 2026-02-20 12:00 |
02:45:25.08 |
+17:02:03.3 |
HIP 12893 |
4.37 |
| 2026-02-21 00:00 |
02:45:46.46 |
+17:03:07.2 |
HIP 12893 |
2.02 |
| 2026-02-21 12:00 |
02:46:07.99 |
+17:04:11.7 |
HIP 12893 |
6.63 |
| 2026-02-22 00:00 |
02:46:29.66 |
+17:05:16.8 |
HIP 12893 |
11.83 |
| 2026-02-22 12:00 |
02:46:51.47 |
+17:06:22.6 |
HIP 13023 |
10.16 |
| 2026-02-23 00:00 |
02:47:13.41 |
+17:07:28.9 |
HIP 13023 |
5.83 |
| 2026-02-23 12:00 |
02:47:35.50 |
+17:08:35.8 |
HIP 13023 |
4.71 |
| 2026-02-24 00:00 |
02:47:57.72 |
+17:09:43.3 |
HIP 13023 |
8.30 |