512P/PANSTARRS
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) |
2025-10-29T19:02:54Z |
| Obs used |
95 |
| NEO |
- |
| M1 |
7.300 |
| K1 |
14.750 |
| PC |
0.030 |
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) |
| 2026-02-03 00:00 |
23:25:33.02 |
-15:20:53.5 |
HIP 115673 |
11.07 |
| 2026-02-03 12:00 |
23:25:58.40 |
-15:17:36.3 |
HIP 115673 |
4.57 |
| 2026-02-04 00:00 |
23:26:23.83 |
-15:14:19.1 |
HIP 115673 |
3.99 |
| 2026-02-04 12:00 |
23:26:49.32 |
-15:11:01.8 |
HIP 115742 |
4.26 |
| 2026-02-05 00:00 |
23:27:14.87 |
-15:07:44.4 |
HIP 115742 |
8.32 |
| 2026-02-05 12:00 |
23:27:40.47 |
-15:04:26.9 |
HIP 115827 |
14.04 |
| 2026-02-06 00:00 |
23:28:06.12 |
-15:01:09.4 |
HIP 115827 |
16.96 |
| 2026-02-06 12:00 |
23:28:31.82 |
-14:57:51.7 |
HIP 115827 |
21.83 |
| 2026-02-07 00:00 |
23:28:57.57 |
-14:54:34.0 |
HIP 115827 |
27.65 |
| 2026-02-07 12:00 |
23:29:23.38 |
-14:51:16.2 |
HIP 115827 |
33.94 |
| 2026-02-08 00:00 |
23:29:49.24 |
-14:47:58.4 |
HIP 116123 |
27.99 |
| 2026-02-08 12:00 |
23:30:15.14 |
-14:44:40.5 |
HIP 116123 |
22.05 |
| 2026-02-09 00:00 |
23:30:41.10 |
-14:41:22.5 |
HIP 116123 |
16.98 |
| 2026-02-09 12:00 |
23:31:07.10 |
-14:38:04.5 |
HIP 116123 |
13.81 |
| 2026-02-10 00:00 |
23:31:33.15 |
-14:34:46.4 |
HIP 116123 |
13.93 |
| 2026-02-10 12:00 |
23:31:59.25 |
-14:31:28.3 |
HIP 116123 |
17.28 |
| 2026-02-11 00:00 |
23:32:25.40 |
-14:28:10.1 |
HIP 116123 |
22.47 |
| 2026-02-11 12:00 |
23:32:51.59 |
-14:24:51.9 |
HIP 116319 |
21.33 |
| 2026-02-12 00:00 |
23:33:17.82 |
-14:21:33.7 |
HIP 116319 |
14.19 |
| 2026-02-12 12:00 |
23:33:44.11 |
-14:18:15.5 |
HIP 116319 |
7.10 |
| 2026-02-13 00:00 |
23:34:10.43 |
-14:14:57.2 |
HIP 116319 |
1.49 |
| 2026-02-13 12:00 |
23:34:36.80 |
-14:11:38.9 |
HIP 116319 |
7.58 |
| 2026-02-14 00:00 |
23:35:03.21 |
-14:08:20.6 |
HIP 116319 |
14.71 |
| 2026-02-14 12:00 |
23:35:29.66 |
-14:05:02.3 |
HIP 116319 |
21.91 |
| 2026-02-15 00:00 |
23:35:56.15 |
-14:01:44.0 |
HIP 116319 |
29.12 |
| 2026-02-15 12:00 |
23:36:22.69 |
-13:58:25.7 |
HIP 116537 |
26.58 |
| 2026-02-16 00:00 |
23:36:49.26 |
-13:55:07.4 |
HIP 116537 |
21.63 |
| 2026-02-16 12:00 |
23:37:15.87 |
-13:51:49.1 |
HIP 116537 |
18.29 |
| 2026-02-17 00:00 |
23:37:42.53 |
-13:48:30.8 |
HIP 116665 |
13.64 |
| 2026-02-17 12:00 |
23:38:09.21 |
-13:45:12.5 |
HIP 116665 |
6.38 |
| 2026-02-18 00:00 |
23:38:35.94 |
-13:41:54.3 |
HIP 116665 |
1.03 |
| 2026-02-18 12:00 |
23:39:02.70 |
-13:38:36.1 |
HIP 116665 |
8.23 |
| 2026-02-19 00:00 |
23:39:29.50 |
-13:35:17.9 |
HIP 116665 |
15.52 |
| 2026-02-19 12:00 |
23:39:56.33 |
-13:31:59.8 |
HIP 116867 |
20.27 |
| 2026-02-20 00:00 |
23:40:23.20 |
-13:28:41.7 |
HIP 116867 |
13.43 |
| 2026-02-20 12:00 |
23:40:50.09 |
-13:25:23.7 |
HIP 116867 |
7.55 |
| 2026-02-21 00:00 |
23:41:17.03 |
-13:22:05.7 |
HIP 116867 |
6.39 |
| 2026-02-21 12:00 |
23:41:43.99 |
-13:18:47.8 |
HIP 116867 |
11.50 |
| 2026-02-22 00:00 |
23:42:10.98 |
-13:15:30.0 |
HIP 116867 |
18.21 |
| 2026-02-22 12:00 |
23:42:38.01 |
-13:12:12.2 |
HIP 117085 |
22.61 |
| 2026-02-23 00:00 |
23:43:05.06 |
-13:08:54.5 |
HIP 117085 |
16.21 |
| 2026-02-23 12:00 |
23:43:32.15 |
-13:05:36.9 |
HIP 117085 |
11.06 |
| 2026-02-24 00:00 |
23:43:59.26 |
-13:02:19.4 |
HIP 117085 |
9.52 |