メタデータ
| 項目 |
値 |
| Designation |
P/2012 G1 (PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2012-03-21T12:15:24.851520Z |
| Orbit solution date (soln_date, UTC) |
2022-03-08T19:43:47Z |
| Obs used |
22 |
| NEO |
- |
| M1 |
14.700 |
| K1 |
10.000 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2012-04-16.0000000 |
| e |
0.32992923 |
| q (au) |
2.794694 |
| a (au) |
4.170744 |
| i (deg) |
12.171310 |
| Ω (om, deg) |
283.395321 |
| ω (w, deg) |
265.751864 |
| M (ma, deg) |
2.949454 |
等級
散乱 + 全体線形
$$
M_a = (16.018 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
16.018 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.500 |
| k |
1.000 |
| δ90 |
10.000 |
| 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) |
| 2026-07-29 00:00 |
03:38:11.88 |
+29:08:24.9 |
HIP 16835 |
20.72 |
| 2026-07-29 12:00 |
03:38:30.64 |
+29:09:54.4 |
HIP 16835 |
24.45 |
| 2026-07-30 00:00 |
03:38:49.26 |
+29:11:23.6 |
HIP 16835 |
28.33 |
| 2026-07-30 12:00 |
03:39:07.76 |
+29:12:52.5 |
HIP 17172 |
24.78 |
| 2026-07-31 00:00 |
03:39:26.13 |
+29:14:21.1 |
HIP 17172 |
20.69 |
| 2026-07-31 12:00 |
03:39:44.38 |
+29:15:49.4 |
HIP 17172 |
16.72 |
| 2026-08-01 00:00 |
03:40:02.49 |
+29:17:17.3 |
HIP 17172 |
12.95 |
| 2026-08-01 12:00 |
03:40:20.47 |
+29:18:45.0 |
HIP 17172 |
9.56 |
| 2026-08-02 00:00 |
03:40:38.32 |
+29:20:12.3 |
HIP 17172 |
7.09 |
| 2026-08-02 12:00 |
03:40:56.04 |
+29:21:39.3 |
HIP 17172 |
6.59 |
| 2026-08-03 00:00 |
03:41:13.62 |
+29:23:06.0 |
HIP 17172 |
8.38 |
| 2026-08-03 12:00 |
03:41:31.06 |
+29:24:32.3 |
HIP 17172 |
11.39 |
| 2026-08-04 00:00 |
03:41:48.37 |
+29:25:58.3 |
HIP 17172 |
14.88 |
| 2026-08-04 12:00 |
03:42:05.54 |
+29:27:24.0 |
HIP 17172 |
18.56 |
| 2026-08-05 00:00 |
03:42:22.57 |
+29:28:49.4 |
HIP 17172 |
22.32 |
| 2026-08-05 12:00 |
03:42:39.46 |
+29:30:14.4 |
HIP 17423 |
20.16 |
| 2026-08-06 00:00 |
03:42:56.21 |
+29:31:39.1 |
HIP 17423 |
16.35 |
| 2026-08-06 12:00 |
03:43:12.81 |
+29:33:03.4 |
HIP 17423 |
12.61 |
| 2026-08-07 00:00 |
03:43:29.27 |
+29:34:27.4 |
HIP 17423 |
9.02 |
| 2026-08-07 12:00 |
03:43:45.59 |
+29:35:51.1 |
HIP 17423 |
5.79 |
| 2026-08-08 00:00 |
03:44:01.75 |
+29:37:14.4 |
HIP 17423 |
3.83 |
| 2026-08-08 12:00 |
03:44:17.77 |
+29:38:37.3 |
HIP 17423 |
4.91 |
| 2026-08-09 00:00 |
03:44:33.64 |
+29:40:00.0 |
HIP 17423 |
7.81 |
| 2026-08-09 12:00 |
03:44:49.35 |
+29:41:22.2 |
HIP 17474 |
8.20 |
| 2026-08-10 00:00 |
03:45:04.92 |
+29:42:44.1 |
HIP 17474 |
8.45 |
| 2026-08-10 12:00 |
03:45:20.33 |
+29:44:05.6 |
HIP 17474 |
10.08 |
| 2026-08-11 00:00 |
03:45:35.58 |
+29:45:26.8 |
HIP 17616 |
12.05 |
| 2026-08-11 12:00 |
03:45:50.68 |
+29:46:47.6 |
HIP 17616 |
10.00 |
| 2026-08-12 00:00 |
03:46:05.62 |
+29:48:08.0 |
HIP 17616 |
8.95 |
| 2026-08-12 12:00 |
03:46:20.40 |
+29:49:28.1 |
HIP 17616 |
9.22 |
| 2026-08-13 00:00 |
03:46:35.02 |
+29:50:47.8 |
HIP 17616 |
10.66 |
| 2026-08-13 12:00 |
03:46:49.48 |
+29:52:07.1 |
HIP 17698 |
7.86 |
| 2026-08-14 00:00 |
03:47:03.77 |
+29:53:26.0 |
HIP 17698 |
4.83 |
| 2026-08-14 12:00 |
03:47:17.90 |
+29:54:44.6 |
HIP 17698 |
2.77 |
| 2026-08-15 00:00 |
03:47:31.87 |
+29:56:02.7 |
HIP 17698 |
3.75 |
| 2026-08-15 12:00 |
03:47:45.67 |
+29:57:20.5 |
HIP 17698 |
6.46 |
| 2026-08-16 00:00 |
03:47:59.30 |
+29:58:37.9 |
HIP 17773 |
4.52 |
| 2026-08-16 12:00 |
03:48:12.76 |
+29:59:54.9 |
HIP 17773 |
3.31 |
| 2026-08-17 00:00 |
03:48:26.05 |
+30:01:11.5 |
HIP 17773 |
4.64 |
| 2026-08-17 12:00 |
03:48:39.18 |
+30:02:27.6 |
HIP 17773 |
7.18 |
| 2026-08-18 00:00 |
03:48:52.13 |
+30:03:43.4 |
HIP 17773 |
10.01 |
| 2026-08-18 12:00 |
03:49:04.91 |
+30:04:58.8 |
HIP 17773 |
12.92 |
| 2026-08-19 00:00 |
03:49:17.51 |
+30:06:13.8 |
HIP 17773 |
15.85 |