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) |
| 2026-06-01 00:00 |
20:13:22.79 |
-17:24:27.3 |
HIP 99710 |
18.35 |
| 2026-06-01 12:00 |
20:13:19.13 |
-17:24:38.0 |
HIP 99710 |
18.63 |
| 2026-06-02 00:00 |
20:13:15.41 |
-17:24:49.0 |
HIP 99710 |
18.95 |
| 2026-06-02 12:00 |
20:13:11.64 |
-17:25:00.1 |
HIP 99710 |
19.32 |
| 2026-06-03 00:00 |
20:13:07.81 |
-17:25:11.4 |
HIP 99710 |
19.72 |
| 2026-06-03 12:00 |
20:13:03.93 |
-17:25:23.0 |
HIP 99710 |
20.17 |
| 2026-06-04 00:00 |
20:13:00.00 |
-17:25:34.7 |
HIP 99710 |
20.66 |
| 2026-06-04 12:00 |
20:12:56.02 |
-17:25:46.6 |
HIP 99710 |
21.18 |
| 2026-06-05 00:00 |
20:12:51.98 |
-17:25:58.7 |
HIP 99710 |
21.75 |
| 2026-06-05 12:00 |
20:12:47.89 |
-17:26:11.0 |
HIP 99710 |
22.35 |
| 2026-06-06 00:00 |
20:12:43.75 |
-17:26:23.5 |
HIP 99710 |
22.98 |
| 2026-06-06 12:00 |
20:12:39.56 |
-17:26:36.1 |
HIP 99710 |
23.65 |
| 2026-06-07 00:00 |
20:12:35.31 |
-17:26:49.0 |
HIP 99710 |
24.35 |
| 2026-06-07 12:00 |
20:12:31.02 |
-17:27:02.0 |
HIP 99710 |
25.08 |
| 2026-06-08 00:00 |
20:12:26.67 |
-17:27:15.2 |
HIP 99710 |
25.85 |
| 2026-06-08 12:00 |
20:12:22.28 |
-17:27:28.6 |
HIP 99710 |
26.64 |
| 2026-06-09 00:00 |
20:12:17.83 |
-17:27:42.2 |
HIP 99468 |
26.09 |
| 2026-06-09 12:00 |
20:12:13.34 |
-17:27:56.0 |
HIP 99468 |
25.31 |
| 2026-06-10 00:00 |
20:12:08.79 |
-17:28:09.9 |
HIP 99468 |
24.55 |
| 2026-06-10 12:00 |
20:12:04.20 |
-17:28:24.1 |
HIP 99468 |
23.81 |
| 2026-06-11 00:00 |
20:11:59.56 |
-17:28:38.4 |
HIP 99468 |
23.09 |
| 2026-06-11 12:00 |
20:11:54.87 |
-17:28:52.9 |
HIP 99468 |
22.39 |
| 2026-06-12 00:00 |
20:11:50.13 |
-17:29:07.5 |
HIP 99468 |
21.73 |
| 2026-06-12 12:00 |
20:11:45.35 |
-17:29:22.3 |
HIP 99468 |
21.10 |
| 2026-06-13 00:00 |
20:11:40.52 |
-17:29:37.4 |
HIP 99468 |
20.52 |
| 2026-06-13 12:00 |
20:11:35.65 |
-17:29:52.5 |
HIP 99468 |
19.98 |
| 2026-06-14 00:00 |
20:11:30.72 |
-17:30:07.9 |
HIP 99468 |
19.50 |
| 2026-06-14 12:00 |
20:11:25.76 |
-17:30:23.4 |
HIP 99468 |
19.07 |
| 2026-06-15 00:00 |
20:11:20.74 |
-17:30:39.1 |
HIP 99468 |
18.71 |
| 2026-06-15 12:00 |
20:11:15.69 |
-17:30:54.9 |
HIP 99468 |
18.42 |
| 2026-06-16 00:00 |
20:11:10.59 |
-17:31:10.9 |
HIP 99468 |
18.21 |
| 2026-06-16 12:00 |
20:11:05.44 |
-17:31:27.1 |
HIP 99468 |
18.08 |
| 2026-06-17 00:00 |
20:11:00.26 |
-17:31:43.4 |
HIP 99468 |
18.04 |
| 2026-06-17 12:00 |
20:10:55.03 |
-17:32:00.0 |
HIP 99468 |
18.08 |
| 2026-06-18 00:00 |
20:10:49.76 |
-17:32:16.6 |
HIP 99468 |
18.22 |
| 2026-06-18 12:00 |
20:10:44.45 |
-17:32:33.4 |
HIP 99468 |
18.44 |
| 2026-06-19 00:00 |
20:10:39.10 |
-17:32:50.4 |
HIP 99468 |
18.76 |
| 2026-06-19 12:00 |
20:10:33.71 |
-17:33:07.5 |
HIP 99468 |
19.16 |
| 2026-06-20 00:00 |
20:10:28.28 |
-17:33:24.8 |
HIP 99468 |
19.65 |
| 2026-06-20 12:00 |
20:10:22.81 |
-17:33:42.2 |
HIP 99468 |
20.21 |
| 2026-06-21 00:00 |
20:10:17.30 |
-17:33:59.7 |
HIP 99468 |
20.85 |
| 2026-06-21 12:00 |
20:10:11.75 |
-17:34:17.4 |
HIP 99468 |
21.56 |
| 2026-06-22 00:00 |
20:10:06.17 |
-17:34:35.3 |
HIP 99468 |
22.34 |