メタデータ
| 項目 |
値 |
| Designation |
P/2012 C3 (PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2011-10-05T09:58:58.944000Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:02Z |
| Obs used |
20 |
| NEO |
- |
| M1 |
13.500 |
| K1 |
10.000 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2012-02-17.0000000 |
| e |
0.62652717 |
| q (au) |
3.624891 |
| a (au) |
9.705904 |
| i (deg) |
9.189868 |
| Ω (om, deg) |
135.441268 |
| ω (w, deg) |
344.851612 |
| M (ma, deg) |
4.386758 |
等級
散乱 + 全体線形
$$
M_a = (15.291 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
15.291 |
| n |
2.000 |
| gf |
0.971 |
| gb |
-0.507 |
| k |
1.000 |
| δ90 |
9.990 |
| 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 |
19:53:07.57 |
-18:36:25.9 |
HIP 97811 |
17.68 |
| 2026-09-20 12:00 |
19:53:05.04 |
-18:36:39.7 |
HIP 97811 |
17.63 |
| 2026-09-21 00:00 |
19:53:02.57 |
-18:36:53.3 |
HIP 97811 |
17.61 |
| 2026-09-21 12:00 |
19:53:00.16 |
-18:37:06.7 |
HIP 97811 |
17.61 |
| 2026-09-22 00:00 |
19:52:57.82 |
-18:37:19.9 |
HIP 97811 |
17.63 |
| 2026-09-22 12:00 |
19:52:55.54 |
-18:37:33.0 |
HIP 97811 |
17.68 |
| 2026-09-23 00:00 |
19:52:53.32 |
-18:37:46.0 |
HIP 97811 |
17.75 |
| 2026-09-23 12:00 |
19:52:51.16 |
-18:37:58.8 |
HIP 97811 |
17.83 |
| 2026-09-24 00:00 |
19:52:49.07 |
-18:38:11.4 |
HIP 97811 |
17.93 |
| 2026-09-24 12:00 |
19:52:47.03 |
-18:38:23.8 |
HIP 97811 |
18.05 |
| 2026-09-25 00:00 |
19:52:45.07 |
-18:38:36.1 |
HIP 97811 |
18.18 |
| 2026-09-25 12:00 |
19:52:43.16 |
-18:38:48.2 |
HIP 97811 |
18.32 |
| 2026-09-26 00:00 |
19:52:41.32 |
-18:39:00.2 |
HIP 97811 |
18.48 |
| 2026-09-26 12:00 |
19:52:39.54 |
-18:39:12.0 |
HIP 97811 |
18.64 |
| 2026-09-27 00:00 |
19:52:37.83 |
-18:39:23.6 |
HIP 97811 |
18.81 |
| 2026-09-27 12:00 |
19:52:36.18 |
-18:39:35.1 |
HIP 97811 |
18.99 |
| 2026-09-28 00:00 |
19:52:34.59 |
-18:39:46.4 |
HIP 97811 |
19.17 |
| 2026-09-28 12:00 |
19:52:33.07 |
-18:39:57.5 |
HIP 97811 |
19.36 |
| 2026-09-29 00:00 |
19:52:31.61 |
-18:40:08.5 |
HIP 97811 |
19.55 |
| 2026-09-29 12:00 |
19:52:30.22 |
-18:40:19.2 |
HIP 97811 |
19.74 |
| 2026-09-30 00:00 |
19:52:28.89 |
-18:40:29.9 |
HIP 97811 |
19.94 |
| 2026-09-30 12:00 |
19:52:27.62 |
-18:40:40.3 |
HIP 97811 |
20.13 |
| 2026-10-01 00:00 |
19:52:26.43 |
-18:40:50.6 |
HIP 97811 |
20.33 |
| 2026-10-01 12:00 |
19:52:25.29 |
-18:41:00.7 |
HIP 97811 |
20.52 |
| 2026-10-02 00:00 |
19:52:24.22 |
-18:41:10.6 |
HIP 97811 |
20.72 |
| 2026-10-02 12:00 |
19:52:23.22 |
-18:41:20.4 |
HIP 97811 |
20.91 |
| 2026-10-03 00:00 |
19:52:22.28 |
-18:41:30.0 |
HIP 97811 |
21.09 |
| 2026-10-03 12:00 |
19:52:21.41 |
-18:41:39.4 |
HIP 97783 |
21.15 |
| 2026-10-04 00:00 |
19:52:20.60 |
-18:41:48.7 |
HIP 97783 |
20.98 |
| 2026-10-04 12:00 |
19:52:19.86 |
-18:41:57.7 |
HIP 97783 |
20.81 |
| 2026-10-05 00:00 |
19:52:19.18 |
-18:42:06.6 |
HIP 97783 |
20.65 |
| 2026-10-05 12:00 |
19:52:18.57 |
-18:42:15.3 |
HIP 97783 |
20.49 |
| 2026-10-06 00:00 |
19:52:18.03 |
-18:42:23.9 |
HIP 97783 |
20.34 |
| 2026-10-06 12:00 |
19:52:17.55 |
-18:42:32.3 |
HIP 97783 |
20.20 |
| 2026-10-07 00:00 |
19:52:17.14 |
-18:42:40.4 |
HIP 97783 |
20.05 |
| 2026-10-07 12:00 |
19:52:16.80 |
-18:42:48.4 |
HIP 97783 |
19.92 |
| 2026-10-08 00:00 |
19:52:16.52 |
-18:42:56.3 |
HIP 97783 |
19.78 |
| 2026-10-08 12:00 |
19:52:16.31 |
-18:43:03.9 |
HIP 97783 |
19.65 |
| 2026-10-09 00:00 |
19:52:16.17 |
-18:43:11.4 |
HIP 97783 |
19.53 |
| 2026-10-09 12:00 |
19:52:16.09 |
-18:43:18.7 |
HIP 97783 |
19.40 |
| 2026-10-10 00:00 |
19:52:16.08 |
-18:43:25.8 |
HIP 97783 |
19.29 |
| 2026-10-10 12:00 |
19:52:16.13 |
-18:43:32.7 |
HIP 97783 |
19.17 |
| 2026-10-11 00:00 |
19:52:16.26 |
-18:43:39.4 |
HIP 97783 |
19.06 |