メタデータ
| 項目 |
値 |
| Designation |
C/2012 S4 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2013-06-28T00:33:42.019200Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:22Z |
| Obs used |
924 |
| NEO |
- |
| M1 |
9.400 |
| K1 |
8.750 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2013-04-24.0000000 |
| e |
0.99998199 |
| q (au) |
4.348728 |
| a (au) |
241497.706412 |
| i (deg) |
126.541334 |
| Ω (om, deg) |
173.103524 |
| ω (w, deg) |
163.615485 |
| M (ma, deg) |
359.999999 |
等級
散乱 + 全体線形
$$
M_a = (7.720 + 4.989\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
7.720 |
| n |
4.989 |
| gf |
0.997 |
| gb |
-0.512 |
| k |
0.800 |
| δ90 |
9.110 |
| 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 |
12:57:21.61 |
-59:14:55.0 |
HIP 63275 |
11.07 |
| 2026-05-12 12:00 |
12:57:14.72 |
-59:14:05.1 |
HIP 63275 |
10.79 |
| 2026-05-13 00:00 |
12:57:07.88 |
-59:13:14.9 |
HIP 63275 |
10.64 |
| 2026-05-13 12:00 |
12:57:01.09 |
-59:12:24.4 |
HIP 63275 |
10.62 |
| 2026-05-14 00:00 |
12:56:54.34 |
-59:11:33.7 |
HIP 63275 |
10.72 |
| 2026-05-14 12:00 |
12:56:47.64 |
-59:10:42.6 |
HIP 63275 |
10.96 |
| 2026-05-15 00:00 |
12:56:41.00 |
-59:09:51.2 |
HIP 63275 |
11.31 |
| 2026-05-15 12:00 |
12:56:34.40 |
-59:08:59.6 |
HIP 63275 |
11.77 |
| 2026-05-16 00:00 |
12:56:27.85 |
-59:08:07.6 |
HIP 63275 |
12.32 |
| 2026-05-16 12:00 |
12:56:21.35 |
-59:07:15.4 |
HIP 63049 |
11.20 |
| 2026-05-17 00:00 |
12:56:14.90 |
-59:06:22.9 |
HIP 63049 |
10.03 |
| 2026-05-17 12:00 |
12:56:08.50 |
-59:05:30.2 |
HIP 63049 |
8.87 |
| 2026-05-18 00:00 |
12:56:02.16 |
-59:04:37.2 |
HIP 63049 |
7.74 |
| 2026-05-18 12:00 |
12:55:55.86 |
-59:03:43.9 |
HIP 63049 |
6.63 |
| 2026-05-19 00:00 |
12:55:49.62 |
-59:02:50.4 |
HIP 63049 |
5.57 |
| 2026-05-19 12:00 |
12:55:43.44 |
-59:01:56.7 |
HIP 63049 |
4.57 |
| 2026-05-20 00:00 |
12:55:37.30 |
-59:01:02.7 |
HIP 63049 |
3.71 |
| 2026-05-20 12:00 |
12:55:31.22 |
-59:00:08.4 |
HIP 63049 |
3.09 |
| 2026-05-21 00:00 |
12:55:25.19 |
-58:59:14.0 |
HIP 63049 |
2.87 |
| 2026-05-21 12:00 |
12:55:19.22 |
-58:58:19.3 |
HIP 63049 |
3.13 |
| 2026-05-22 00:00 |
12:55:13.30 |
-58:57:24.4 |
HIP 63049 |
3.77 |
| 2026-05-22 12:00 |
12:55:07.44 |
-58:56:29.2 |
HIP 63049 |
4.64 |
| 2026-05-23 00:00 |
12:55:01.63 |
-58:55:33.9 |
HIP 63049 |
5.63 |
| 2026-05-23 12:00 |
12:54:55.88 |
-58:54:38.3 |
HIP 63049 |
6.69 |
| 2026-05-24 00:00 |
12:54:50.19 |
-58:53:42.5 |
HIP 63049 |
7.78 |
| 2026-05-24 12:00 |
12:54:44.55 |
-58:52:46.5 |
HIP 63049 |
8.90 |
| 2026-05-25 00:00 |
12:54:38.96 |
-58:51:50.4 |
HIP 63049 |
10.03 |
| 2026-05-25 12:00 |
12:54:33.44 |
-58:50:54.0 |
HIP 63049 |
11.18 |
| 2026-05-26 00:00 |
12:54:27.97 |
-58:49:57.5 |
HIP 63049 |
12.33 |
| 2026-05-26 12:00 |
12:54:22.56 |
-58:49:00.7 |
HIP 63049 |
13.48 |
| 2026-05-27 00:00 |
12:54:17.20 |
-58:48:03.8 |
HIP 63049 |
14.64 |
| 2026-05-27 12:00 |
12:54:11.91 |
-58:47:06.7 |
HIP 62823 |
14.04 |
| 2026-05-28 00:00 |
12:54:06.67 |
-58:46:09.5 |
HIP 62823 |
13.24 |
| 2026-05-28 12:00 |
12:54:01.49 |
-58:45:12.0 |
HIP 62823 |
12.51 |
| 2026-05-29 00:00 |
12:53:56.37 |
-58:44:14.4 |
HIP 62823 |
11.86 |
| 2026-05-29 12:00 |
12:53:51.31 |
-58:43:16.7 |
HIP 62823 |
11.30 |
| 2026-05-30 00:00 |
12:53:46.31 |
-58:42:18.8 |
HIP 62823 |
10.84 |
| 2026-05-30 12:00 |
12:53:41.36 |
-58:41:20.7 |
HIP 62823 |
10.49 |
| 2026-05-31 00:00 |
12:53:36.48 |
-58:40:22.5 |
HIP 62823 |
10.28 |
| 2026-05-31 12:00 |
12:53:31.66 |
-58:39:24.2 |
HIP 62823 |
10.20 |
| 2026-06-01 00:00 |
12:53:26.89 |
-58:38:25.7 |
HIP 62823 |
10.26 |
| 2026-06-01 12:00 |
12:53:22.19 |
-58:37:27.1 |
HIP 62823 |
10.45 |
| 2026-06-02 00:00 |
12:53:17.54 |
-58:36:28.4 |
HIP 62823 |
10.77 |