500P/PANSTARRS
メタデータ
| 項目 |
値 |
| Designation |
500P/PANSTARRS |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2025-02-23T01:30:16.018560Z |
| Orbit solution date (soln_date, UTC) |
2025-07-31T16:55:01Z |
| Obs used |
87 |
| NEO |
- |
| M1 |
14.300 |
| K1 |
16.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2019-01-11T15:21:07.488000Z |
| Discovery magnitude (MPC) |
21.50 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) |
2022-06-16.0000000 |
| e |
0.41335657 |
| q (au) |
1.968866 |
| a (au) |
3.356155 |
| i (deg) |
2.381049 |
| Ω (om, deg) |
116.500219 |
| ω (w, deg) |
42.292781 |
| M (ma, deg) |
202.412297 |
等級
散乱 + 全体線形
$$
M_a = (17.498 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
17.498 |
| n |
2.000 |
| gf |
0.992 |
| gb |
-1.000 |
| k |
1.000 |
| δ90 |
9.999 |
| 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 |
17:31:31.31 |
-21:56:30.6 |
HIP 85724 |
28.15 |
| 2026-02-03 12:00 |
17:32:13.85 |
-21:57:00.2 |
HIP 85925 |
22.95 |
| 2026-02-04 00:00 |
17:32:56.25 |
-21:57:29.0 |
HIP 85925 |
15.59 |
| 2026-02-04 12:00 |
17:33:38.49 |
-21:57:57.0 |
HIP 85925 |
12.38 |
| 2026-02-05 00:00 |
17:34:20.59 |
-21:58:24.1 |
HIP 86060 |
14.07 |
| 2026-02-05 12:00 |
17:35:02.53 |
-21:58:50.4 |
HIP 86060 |
5.30 |
| 2026-02-06 00:00 |
17:35:44.32 |
-21:59:15.9 |
HIP 86060 |
6.87 |
| 2026-02-06 12:00 |
17:36:25.96 |
-21:59:40.5 |
HIP 86060 |
15.91 |
| 2026-02-07 00:00 |
17:37:07.44 |
-22:00:04.4 |
HIP 86352 |
23.21 |
| 2026-02-07 12:00 |
17:37:48.77 |
-22:00:27.4 |
HIP 86352 |
14.20 |
| 2026-02-08 00:00 |
17:38:29.94 |
-22:00:49.7 |
HIP 86352 |
6.99 |
| 2026-02-08 12:00 |
17:39:10.95 |
-22:01:11.2 |
HIP 86352 |
8.82 |
| 2026-02-09 00:00 |
17:39:51.80 |
-22:01:31.9 |
HIP 86352 |
16.93 |
| 2026-02-09 12:00 |
17:40:32.48 |
-22:01:51.8 |
HIP 86517 |
16.83 |
| 2026-02-10 00:00 |
17:41:13.01 |
-22:02:10.9 |
HIP 86517 |
16.85 |
| 2026-02-10 12:00 |
17:41:53.37 |
-22:02:29.3 |
HIP 86618 |
16.35 |
| 2026-02-11 00:00 |
17:42:33.56 |
-22:02:47.0 |
HIP 86618 |
18.03 |
| 2026-02-11 12:00 |
17:43:13.59 |
-22:03:03.9 |
HIP 86819 |
18.44 |
| 2026-02-12 00:00 |
17:43:53.45 |
-22:03:20.1 |
HIP 86819 |
10.95 |
| 2026-02-12 12:00 |
17:44:33.15 |
-22:03:35.5 |
HIP 86819 |
8.38 |
| 2026-02-13 00:00 |
17:45:12.67 |
-22:03:50.3 |
HIP 86931 |
10.24 |
| 2026-02-13 12:00 |
17:45:52.01 |
-22:04:04.3 |
HIP 86931 |
6.98 |
| 2026-02-14 00:00 |
17:46:31.19 |
-22:04:17.6 |
HIP 86931 |
12.57 |
| 2026-02-14 12:00 |
17:47:10.19 |
-22:04:30.3 |
HIP 86931 |
20.75 |
| 2026-02-15 00:00 |
17:47:49.01 |
-22:04:42.2 |
HIP 87099 |
23.98 |
| 2026-02-15 12:00 |
17:48:27.66 |
-22:04:53.5 |
HIP 87099 |
25.69 |
| 2026-02-16 00:00 |
17:49:06.12 |
-22:05:04.1 |
HIP 87332 |
23.44 |
| 2026-02-16 12:00 |
17:49:44.41 |
-22:05:14.0 |
HIP 87332 |
15.77 |
| 2026-02-17 00:00 |
17:50:22.51 |
-22:05:23.3 |
HIP 87332 |
10.27 |
| 2026-02-17 12:00 |
17:51:00.43 |
-22:05:31.9 |
HIP 87332 |
10.85 |
| 2026-02-18 00:00 |
17:51:38.17 |
-22:05:39.9 |
HIP 87458 |
9.06 |
| 2026-02-18 12:00 |
17:52:15.72 |
-22:05:47.3 |
HIP 87458 |
3.93 |
| 2026-02-19 00:00 |
17:52:53.08 |
-22:05:54.1 |
HIP 87458 |
9.97 |
| 2026-02-19 12:00 |
17:53:30.25 |
-22:06:00.2 |
HIP 87458 |
18.21 |
| 2026-02-20 00:00 |
17:54:07.24 |
-22:06:05.8 |
HIP 87578 |
21.82 |
| 2026-02-20 12:00 |
17:54:44.03 |
-22:06:10.7 |
HIP 87819 |
24.20 |
| 2026-02-21 00:00 |
17:55:20.63 |
-22:06:15.1 |
HIP 87819 |
16.63 |
| 2026-02-21 12:00 |
17:55:57.04 |
-22:06:18.9 |
HIP 87819 |
10.57 |
| 2026-02-22 00:00 |
17:56:33.25 |
-22:06:22.1 |
HIP 87819 |
9.43 |
| 2026-02-22 12:00 |
17:57:09.26 |
-22:06:24.8 |
HIP 87929 |
11.05 |
| 2026-02-23 00:00 |
17:57:45.08 |
-22:06:26.9 |
HIP 87929 |
7.58 |
| 2026-02-23 12:00 |
17:58:20.70 |
-22:06:28.5 |
HIP 87929 |
11.38 |
| 2026-02-24 00:00 |
17:58:56.12 |
-22:06:29.5 |
HIP 88039 |
16.55 |