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 |
1.000 |
| gb |
-0.832 |
| k |
0.800 |
| 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) |
| 2026-05-12 00:00 |
00:53:36.16 |
-05:33:47.9 |
HIP 4156 |
8.19 |
| 2026-05-12 12:00 |
00:54:01.15 |
-05:31:32.4 |
HIP 4156 |
14.80 |
| 2026-05-13 00:00 |
00:54:26.09 |
-05:29:17.5 |
HIP 4308 |
11.68 |
| 2026-05-13 12:00 |
00:54:50.96 |
-05:27:03.4 |
HIP 4308 |
5.14 |
| 2026-05-14 00:00 |
00:55:15.78 |
-05:24:50.0 |
HIP 4308 |
1.71 |
| 2026-05-14 12:00 |
00:55:40.55 |
-05:22:37.3 |
HIP 4372 |
7.33 |
| 2026-05-15 00:00 |
00:56:05.25 |
-05:20:25.4 |
HIP 4372 |
7.38 |
| 2026-05-15 12:00 |
00:56:29.89 |
-05:18:14.2 |
HIP 4372 |
11.84 |
| 2026-05-16 00:00 |
00:56:54.47 |
-05:16:03.7 |
HIP 4372 |
17.60 |
| 2026-05-16 12:00 |
00:57:19.00 |
-05:13:54.0 |
HIP 4372 |
23.73 |
| 2026-05-17 00:00 |
00:57:43.46 |
-05:11:45.0 |
HIP 4372 |
29.98 |
| 2026-05-17 12:00 |
00:58:07.85 |
-05:09:36.9 |
HIP 4661 |
26.34 |
| 2026-05-18 00:00 |
00:58:32.18 |
-05:07:29.4 |
HIP 4661 |
20.55 |
| 2026-05-18 12:00 |
00:58:56.45 |
-05:05:22.8 |
HIP 4661 |
15.29 |
| 2026-05-19 00:00 |
00:59:20.66 |
-05:03:16.9 |
HIP 4661 |
11.27 |
| 2026-05-19 12:00 |
00:59:44.79 |
-05:01:11.8 |
HIP 4661 |
10.08 |
| 2026-05-20 00:00 |
01:00:08.87 |
-04:59:07.4 |
HIP 4661 |
12.52 |
| 2026-05-20 12:00 |
01:00:32.87 |
-04:57:03.8 |
HIP 4661 |
17.07 |
| 2026-05-21 00:00 |
01:00:56.81 |
-04:55:01.1 |
HIP 4747 |
16.17 |
| 2026-05-21 12:00 |
01:01:20.68 |
-04:52:59.1 |
HIP 4747 |
14.86 |
| 2026-05-22 00:00 |
01:01:44.48 |
-04:50:57.9 |
HIP 4747 |
16.09 |
| 2026-05-22 12:00 |
01:02:08.21 |
-04:48:57.5 |
HIP 4914 |
13.61 |
| 2026-05-23 00:00 |
01:02:31.87 |
-04:46:57.9 |
HIP 4914 |
8.31 |
| 2026-05-23 12:00 |
01:02:55.46 |
-04:44:59.1 |
HIP 4914 |
5.49 |
| 2026-05-24 00:00 |
01:03:18.98 |
-04:43:01.0 |
HIP 4914 |
8.24 |
| 2026-05-24 12:00 |
01:03:42.42 |
-04:41:03.8 |
HIP 4914 |
13.47 |
| 2026-05-25 00:00 |
01:04:05.80 |
-04:39:07.4 |
HIP 4914 |
19.24 |
| 2026-05-25 12:00 |
01:04:29.10 |
-04:37:11.9 |
HIP 4914 |
25.16 |
| 2026-05-26 00:00 |
01:04:52.32 |
-04:35:17.1 |
HIP 5220 |
28.45 |
| 2026-05-26 12:00 |
01:05:15.48 |
-04:33:23.1 |
HIP 5220 |
23.13 |
| 2026-05-27 00:00 |
01:05:38.55 |
-04:31:30.0 |
HIP 5220 |
18.30 |
| 2026-05-27 12:00 |
01:06:01.56 |
-04:29:37.7 |
HIP 5220 |
14.43 |
| 2026-05-28 00:00 |
01:06:24.48 |
-04:27:46.2 |
HIP 5220 |
12.42 |
| 2026-05-28 12:00 |
01:06:47.33 |
-04:25:55.5 |
HIP 5220 |
13.11 |
| 2026-05-29 00:00 |
01:07:10.11 |
-04:24:05.7 |
HIP 5281 |
12.94 |
| 2026-05-29 12:00 |
01:07:32.80 |
-04:22:16.7 |
HIP 5281 |
9.86 |
| 2026-05-30 00:00 |
01:07:55.42 |
-04:20:28.5 |
HIP 5281 |
9.88 |
| 2026-05-30 12:00 |
01:08:17.95 |
-04:18:41.2 |
HIP 5281 |
12.96 |
| 2026-05-31 00:00 |
01:08:40.41 |
-04:16:54.8 |
HIP 5281 |
17.52 |
| 2026-05-31 12:00 |
01:09:02.79 |
-04:15:09.1 |
HIP 5281 |
22.68 |
| 2026-06-01 00:00 |
01:09:25.08 |
-04:13:24.4 |
HIP 5281 |
28.09 |
| 2026-06-01 12:00 |
01:09:47.30 |
-04:11:40.5 |
HIP 5281 |
33.62 |
| 2026-06-02 00:00 |
01:10:09.43 |
-04:09:57.4 |
HIP 5620 |
35.65 |