メタデータ
| 項目 |
値 |
| Designation |
512P/PANSTARRS |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2013-03-26T20:06:03.300480Z |
| Orbit solution date (soln_date, UTC) |
2026-03-12T02:52:39Z |
| Obs used |
95 |
| NEO |
- |
| M1 |
7.300 |
| K1 |
14.750 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2012-10-10T08:37:45.206400Z |
| Discovery magnitude (MPC) |
21.10 T |
| 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) |
2018-04-16.0000000 |
| e |
0.15528156 |
| q (au) |
4.838682 |
| a (au) |
5.728160 |
| i (deg) |
12.552486 |
| Ω (om, deg) |
73.777821 |
| ω (w, deg) |
308.074423 |
| M (ma, deg) |
132.724572 |
等級
散乱 + 全体線形
$$
M_a = (11.865 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
11.865 |
| n |
6.000 |
| gf |
0.996 |
| gb |
-0.832 |
| k |
0.800 |
| δ90 |
9.998 |
| 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) |
| 2026-07-29 00:00 |
01:39:44.86 |
-02:41:25.2 |
HIP 7736 |
10.51 |
| 2026-07-29 12:00 |
01:39:52.00 |
-02:41:39.2 |
HIP 7736 |
11.14 |
| 2026-07-30 00:00 |
01:39:58.97 |
-02:41:54.3 |
HIP 7736 |
12.01 |
| 2026-07-30 12:00 |
01:40:05.76 |
-02:42:10.5 |
HIP 7832 |
11.25 |
| 2026-07-31 00:00 |
01:40:12.37 |
-02:42:27.7 |
HIP 7832 |
9.93 |
| 2026-07-31 12:00 |
01:40:18.80 |
-02:42:45.9 |
HIP 7832 |
8.78 |
| 2026-08-01 00:00 |
01:40:25.05 |
-02:43:05.2 |
HIP 7832 |
7.86 |
| 2026-08-01 12:00 |
01:40:31.12 |
-02:43:25.6 |
HIP 7832 |
7.21 |
| 2026-08-02 00:00 |
01:40:37.01 |
-02:43:47.0 |
HIP 7832 |
6.88 |
| 2026-08-02 12:00 |
01:40:42.72 |
-02:44:09.4 |
HIP 7832 |
6.91 |
| 2026-08-03 00:00 |
01:40:48.24 |
-02:44:32.9 |
HIP 7832 |
7.26 |
| 2026-08-03 12:00 |
01:40:53.58 |
-02:44:57.5 |
HIP 7832 |
7.86 |
| 2026-08-04 00:00 |
01:40:58.74 |
-02:45:23.0 |
HIP 7832 |
8.65 |
| 2026-08-04 12:00 |
01:41:03.71 |
-02:45:49.6 |
HIP 7832 |
9.56 |
| 2026-08-05 00:00 |
01:41:08.49 |
-02:46:17.3 |
HIP 7832 |
10.55 |
| 2026-08-05 12:00 |
01:41:13.09 |
-02:46:45.9 |
HIP 7832 |
11.58 |
| 2026-08-06 00:00 |
01:41:17.51 |
-02:47:15.6 |
HIP 7904 |
11.49 |
| 2026-08-06 12:00 |
01:41:21.73 |
-02:47:46.3 |
HIP 7904 |
10.59 |
| 2026-08-07 00:00 |
01:41:25.77 |
-02:48:18.1 |
HIP 7904 |
9.75 |
| 2026-08-07 12:00 |
01:41:29.61 |
-02:48:50.8 |
HIP 7904 |
8.97 |
| 2026-08-08 00:00 |
01:41:33.27 |
-02:49:24.6 |
HIP 7904 |
8.24 |
| 2026-08-08 12:00 |
01:41:36.74 |
-02:49:59.4 |
HIP 7904 |
7.59 |
| 2026-08-09 00:00 |
01:41:40.01 |
-02:50:35.1 |
HIP 7904 |
7.01 |
| 2026-08-09 12:00 |
01:41:43.10 |
-02:51:11.9 |
HIP 7904 |
6.51 |
| 2026-08-10 00:00 |
01:41:45.99 |
-02:51:49.7 |
HIP 7904 |
6.10 |
| 2026-08-10 12:00 |
01:41:48.69 |
-02:52:28.4 |
HIP 7904 |
5.78 |
| 2026-08-11 00:00 |
01:41:51.20 |
-02:53:08.1 |
HIP 7904 |
5.56 |
| 2026-08-11 12:00 |
01:41:53.51 |
-02:53:48.9 |
HIP 7904 |
5.43 |
| 2026-08-12 00:00 |
01:41:55.63 |
-02:54:30.5 |
HIP 7904 |
5.40 |
| 2026-08-12 12:00 |
01:41:57.56 |
-02:55:13.2 |
HIP 7904 |
5.46 |
| 2026-08-13 00:00 |
01:41:59.29 |
-02:55:56.8 |
HIP 7904 |
5.61 |
| 2026-08-13 12:00 |
01:42:00.83 |
-02:56:41.3 |
HIP 7904 |
5.82 |
| 2026-08-14 00:00 |
01:42:02.17 |
-02:57:26.8 |
HIP 7904 |
6.08 |
| 2026-08-14 12:00 |
01:42:03.32 |
-02:58:13.2 |
HIP 7904 |
6.40 |
| 2026-08-15 00:00 |
01:42:04.28 |
-02:59:00.5 |
HIP 7904 |
6.76 |
| 2026-08-15 12:00 |
01:42:05.03 |
-02:59:48.8 |
HIP 7904 |
7.16 |
| 2026-08-16 00:00 |
01:42:05.60 |
-03:00:37.9 |
HIP 7904 |
7.58 |
| 2026-08-16 12:00 |
01:42:05.97 |
-03:01:27.9 |
HIP 7904 |
8.03 |
| 2026-08-17 00:00 |
01:42:06.14 |
-03:02:18.9 |
HIP 7904 |
8.51 |
| 2026-08-17 12:00 |
01:42:06.12 |
-03:03:10.7 |
HIP 7904 |
9.02 |
| 2026-08-18 00:00 |
01:42:05.90 |
-03:04:03.4 |
HIP 7904 |
9.55 |
| 2026-08-18 12:00 |
01:42:05.49 |
-03:04:56.9 |
HIP 7904 |
10.10 |
| 2026-08-19 00:00 |
01:42:04.88 |
-03:05:51.3 |
HIP 7904 |
10.69 |