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) |
| 2026-09-20 00:00 |
03:55:51.84 |
+31:09:04.0 |
HIP 18350 |
8.82 |
| 2026-09-20 12:00 |
03:55:50.84 |
+31:09:43.1 |
HIP 18350 |
9.16 |
| 2026-09-21 00:00 |
03:55:49.59 |
+31:10:21.3 |
HIP 18350 |
9.49 |
| 2026-09-21 12:00 |
03:55:48.12 |
+31:10:58.8 |
HIP 18350 |
9.82 |
| 2026-09-22 00:00 |
03:55:46.40 |
+31:11:35.6 |
HIP 18350 |
10.15 |
| 2026-09-22 12:00 |
03:55:44.45 |
+31:12:11.5 |
HIP 18350 |
10.49 |
| 2026-09-23 00:00 |
03:55:42.26 |
+31:12:46.7 |
HIP 18350 |
10.84 |
| 2026-09-23 12:00 |
03:55:39.83 |
+31:13:21.1 |
HIP 18350 |
11.19 |
| 2026-09-24 00:00 |
03:55:37.17 |
+31:13:54.7 |
HIP 18350 |
11.56 |
| 2026-09-24 12:00 |
03:55:34.26 |
+31:14:27.5 |
HIP 18350 |
11.95 |
| 2026-09-25 00:00 |
03:55:31.12 |
+31:14:59.5 |
HIP 18350 |
12.36 |
| 2026-09-25 12:00 |
03:55:27.74 |
+31:15:30.6 |
HIP 18350 |
12.80 |
| 2026-09-26 00:00 |
03:55:24.13 |
+31:16:00.9 |
HIP 18350 |
13.27 |
| 2026-09-26 12:00 |
03:55:20.27 |
+31:16:30.4 |
HIP 18350 |
13.77 |
| 2026-09-27 00:00 |
03:55:16.17 |
+31:16:59.0 |
HIP 18350 |
14.31 |
| 2026-09-27 12:00 |
03:55:11.84 |
+31:17:26.8 |
HIP 18350 |
14.89 |
| 2026-09-28 00:00 |
03:55:07.27 |
+31:17:53.7 |
HIP 18350 |
15.52 |
| 2026-09-28 12:00 |
03:55:02.46 |
+31:18:19.8 |
HIP 18350 |
16.19 |
| 2026-09-29 00:00 |
03:54:57.40 |
+31:18:44.9 |
HIP 18350 |
16.91 |
| 2026-09-29 12:00 |
03:54:52.11 |
+31:19:09.2 |
HIP 18350 |
17.69 |
| 2026-09-30 00:00 |
03:54:46.58 |
+31:19:32.5 |
HIP 18350 |
18.52 |
| 2026-09-30 12:00 |
03:54:40.82 |
+31:19:55.0 |
HIP 18350 |
19.40 |
| 2026-10-01 00:00 |
03:54:34.81 |
+31:20:16.5 |
HIP 18350 |
20.34 |
| 2026-10-01 12:00 |
03:54:28.56 |
+31:20:37.1 |
HIP 18258 |
20.77 |
| 2026-10-02 00:00 |
03:54:22.07 |
+31:20:56.8 |
HIP 18258 |
21.03 |
| 2026-10-02 12:00 |
03:54:15.35 |
+31:21:15.6 |
HIP 18258 |
21.37 |
| 2026-10-03 00:00 |
03:54:08.38 |
+31:21:33.3 |
HIP 18258 |
21.80 |
| 2026-10-03 12:00 |
03:54:01.18 |
+31:21:50.1 |
HIP 18258 |
22.31 |
| 2026-10-04 00:00 |
03:53:53.74 |
+31:22:06.0 |
HIP 18258 |
22.92 |
| 2026-10-04 12:00 |
03:53:46.06 |
+31:22:20.8 |
HIP 18258 |
23.62 |
| 2026-10-05 00:00 |
03:53:38.14 |
+31:22:34.7 |
HIP 18094 |
23.58 |
| 2026-10-05 12:00 |
03:53:29.99 |
+31:22:47.6 |
HIP 18094 |
22.24 |
| 2026-10-06 00:00 |
03:53:21.60 |
+31:22:59.4 |
HIP 18094 |
20.91 |
| 2026-10-06 12:00 |
03:53:12.97 |
+31:23:10.2 |
HIP 18094 |
19.61 |
| 2026-10-07 00:00 |
03:53:04.11 |
+31:23:20.1 |
HIP 18094 |
18.36 |
| 2026-10-07 12:00 |
03:52:55.01 |
+31:23:28.8 |
HIP 18094 |
17.18 |
| 2026-10-08 00:00 |
03:52:45.68 |
+31:23:36.5 |
HIP 18094 |
16.11 |
| 2026-10-08 12:00 |
03:52:36.12 |
+31:23:43.2 |
HIP 18094 |
15.19 |
| 2026-10-09 00:00 |
03:52:26.32 |
+31:23:48.8 |
HIP 18094 |
14.47 |
| 2026-10-09 12:00 |
03:52:16.30 |
+31:23:53.3 |
HIP 18094 |
14.00 |
| 2026-10-10 00:00 |
03:52:06.04 |
+31:23:56.8 |
HIP 18094 |
13.83 |
| 2026-10-10 12:00 |
03:51:55.56 |
+31:23:59.2 |
HIP 18094 |
14.00 |
| 2026-10-11 00:00 |
03:51:44.85 |
+31:24:00.4 |
HIP 18094 |
14.51 |