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) |
| 2026-09-20 00:00 |
05:57:38.24 |
+21:48:04.4 |
HIP 28188 |
11.17 |
| 2026-09-20 12:00 |
05:57:48.92 |
+21:47:34.7 |
HIP 28188 |
12.49 |
| 2026-09-21 00:00 |
05:57:59.40 |
+21:47:04.8 |
HIP 28188 |
14.13 |
| 2026-09-21 12:00 |
05:58:09.67 |
+21:46:34.8 |
HIP 28188 |
15.95 |
| 2026-09-22 00:00 |
05:58:19.73 |
+21:46:04.6 |
HIP 28188 |
17.89 |
| 2026-09-22 12:00 |
05:58:29.59 |
+21:45:34.3 |
HIP 28374 |
18.75 |
| 2026-09-23 00:00 |
05:58:39.23 |
+21:45:03.8 |
HIP 28374 |
16.56 |
| 2026-09-23 12:00 |
05:58:48.67 |
+21:44:33.2 |
HIP 28374 |
14.45 |
| 2026-09-24 00:00 |
05:58:57.90 |
+21:44:02.5 |
HIP 28374 |
12.43 |
| 2026-09-24 12:00 |
05:59:06.92 |
+21:43:31.6 |
HIP 28374 |
10.51 |
| 2026-09-25 00:00 |
05:59:15.73 |
+21:43:00.7 |
HIP 28374 |
8.74 |
| 2026-09-25 12:00 |
05:59:24.32 |
+21:42:29.5 |
HIP 28374 |
7.18 |
| 2026-09-26 00:00 |
05:59:32.70 |
+21:41:58.3 |
HIP 28374 |
5.94 |
| 2026-09-26 12:00 |
05:59:40.87 |
+21:41:27.0 |
HIP 28374 |
5.20 |
| 2026-09-27 00:00 |
05:59:48.82 |
+21:40:55.5 |
HIP 28374 |
5.14 |
| 2026-09-27 12:00 |
05:59:56.56 |
+21:40:23.9 |
HIP 28374 |
5.72 |
| 2026-09-28 00:00 |
06:00:04.08 |
+21:39:52.3 |
HIP 28374 |
6.74 |
| 2026-09-28 12:00 |
06:00:11.38 |
+21:39:20.5 |
HIP 28374 |
8.00 |
| 2026-09-29 00:00 |
06:00:18.46 |
+21:38:48.5 |
HIP 28374 |
9.38 |
| 2026-09-29 12:00 |
06:00:25.32 |
+21:38:16.5 |
HIP 28374 |
10.81 |
| 2026-09-30 00:00 |
06:00:31.97 |
+21:37:44.4 |
HIP 28374 |
12.26 |
| 2026-09-30 12:00 |
06:00:38.39 |
+21:37:12.2 |
HIP 28374 |
13.69 |
| 2026-10-01 00:00 |
06:00:44.58 |
+21:36:39.9 |
HIP 28541 |
14.05 |
| 2026-10-01 12:00 |
06:00:50.56 |
+21:36:07.4 |
HIP 28541 |
12.65 |
| 2026-10-02 00:00 |
06:00:56.31 |
+21:35:34.9 |
HIP 28541 |
11.31 |
| 2026-10-02 12:00 |
06:01:01.83 |
+21:35:02.3 |
HIP 28541 |
10.03 |
| 2026-10-03 00:00 |
06:01:07.13 |
+21:34:29.6 |
HIP 28541 |
8.81 |
| 2026-10-03 12:00 |
06:01:12.19 |
+21:33:56.8 |
HIP 28541 |
7.67 |
| 2026-10-04 00:00 |
06:01:17.03 |
+21:33:23.9 |
HIP 28541 |
6.61 |
| 2026-10-04 12:00 |
06:01:21.64 |
+21:32:51.0 |
HIP 28541 |
5.64 |
| 2026-10-05 00:00 |
06:01:26.02 |
+21:32:17.9 |
HIP 28541 |
4.80 |
| 2026-10-05 12:00 |
06:01:30.17 |
+21:31:44.8 |
HIP 28541 |
4.12 |
| 2026-10-06 00:00 |
06:01:34.09 |
+21:31:11.6 |
HIP 28541 |
3.64 |
| 2026-10-06 12:00 |
06:01:37.77 |
+21:30:38.3 |
HIP 28541 |
3.41 |
| 2026-10-07 00:00 |
06:01:41.22 |
+21:30:05.0 |
HIP 28541 |
3.44 |
| 2026-10-07 12:00 |
06:01:44.44 |
+21:29:31.5 |
HIP 28541 |
3.69 |
| 2026-10-08 00:00 |
06:01:47.42 |
+21:28:58.1 |
HIP 28541 |
4.08 |
| 2026-10-08 12:00 |
06:01:50.16 |
+21:28:24.5 |
HIP 28541 |
4.56 |
| 2026-10-09 00:00 |
06:01:52.67 |
+21:27:50.9 |
HIP 28541 |
5.08 |
| 2026-10-09 12:00 |
06:01:54.94 |
+21:27:17.2 |
HIP 28541 |
5.61 |
| 2026-10-10 00:00 |
06:01:56.97 |
+21:26:43.4 |
HIP 28541 |
6.14 |
| 2026-10-10 12:00 |
06:01:58.76 |
+21:26:09.6 |
HIP 28541 |
6.66 |
| 2026-10-11 00:00 |
06:02:00.32 |
+21:25:35.8 |
HIP 28541 |
7.15 |