メタデータ
| 項目 |
値 |
| Designation |
P/2017 G1 (PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2016-05-02T00:43:36.451200Z |
| Orbit solution date (soln_date, UTC) |
2024-02-01T00:43:31Z |
| Obs used |
28 |
| NEO |
- |
| M1 |
15.700 |
| K1 |
6.250 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2017-04-10.0000000 |
| e |
0.65703536 |
| q (au) |
2.620459 |
| a (au) |
7.640611 |
| i (deg) |
3.575512 |
| Ω (om, deg) |
258.564840 |
| ω (w, deg) |
217.570539 |
| M (ma, deg) |
16.005444 |
等級
散乱 + 全体線形
$$
M_a = (17.768 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
17.768 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.557 |
| k |
0.800 |
| 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) |
| 2026-03-26 00:00 |
19:58:08.47 |
-16:57:12.3 |
HIP 98150 |
27.90 |
| 2026-03-26 12:00 |
19:58:14.07 |
-16:56:46.2 |
HIP 98150 |
28.53 |
| 2026-03-27 00:00 |
19:58:19.59 |
-16:56:20.2 |
HIP 98150 |
29.21 |
| 2026-03-27 12:00 |
19:58:25.04 |
-16:55:54.4 |
HIP 98150 |
29.92 |
| 2026-03-28 00:00 |
19:58:30.42 |
-16:55:28.7 |
HIP 98150 |
30.67 |
| 2026-03-28 12:00 |
19:58:35.72 |
-16:55:03.2 |
HIP 98150 |
31.44 |
| 2026-03-29 00:00 |
19:58:40.95 |
-16:54:37.8 |
HIP 98150 |
32.24 |
| 2026-03-29 12:00 |
19:58:46.10 |
-16:54:12.6 |
HIP 98150 |
33.05 |
| 2026-03-30 00:00 |
19:58:51.18 |
-16:53:47.6 |
HIP 98150 |
33.89 |
| 2026-03-30 12:00 |
19:58:56.19 |
-16:53:22.7 |
HIP 98150 |
34.73 |
| 2026-03-31 00:00 |
19:59:01.12 |
-16:52:58.1 |
HIP 98150 |
35.59 |
| 2026-03-31 12:00 |
19:59:05.98 |
-16:52:33.5 |
HIP 98589 |
35.11 |
| 2026-04-01 00:00 |
19:59:10.75 |
-16:52:09.2 |
HIP 98589 |
33.96 |
| 2026-04-01 12:00 |
19:59:15.46 |
-16:51:45.0 |
HIP 98589 |
32.84 |
| 2026-04-02 00:00 |
19:59:20.08 |
-16:51:21.0 |
HIP 98589 |
31.74 |
| 2026-04-02 12:00 |
19:59:24.63 |
-16:50:57.2 |
HIP 98589 |
30.67 |
| 2026-04-03 00:00 |
19:59:29.11 |
-16:50:33.6 |
HIP 98589 |
29.61 |
| 2026-04-03 12:00 |
19:59:33.50 |
-16:50:10.1 |
HIP 98589 |
28.59 |
| 2026-04-04 00:00 |
19:59:37.82 |
-16:49:46.8 |
HIP 98555 |
27.58 |
| 2026-04-04 12:00 |
19:59:42.06 |
-16:49:23.7 |
HIP 98555 |
26.53 |
| 2026-04-05 00:00 |
19:59:46.23 |
-16:49:00.8 |
HIP 98555 |
25.49 |
| 2026-04-05 12:00 |
19:59:50.31 |
-16:48:38.1 |
HIP 98555 |
24.48 |
| 2026-04-06 00:00 |
19:59:54.32 |
-16:48:15.6 |
HIP 98555 |
23.49 |
| 2026-04-06 12:00 |
19:59:58.25 |
-16:47:53.2 |
HIP 98555 |
22.51 |
| 2026-04-07 00:00 |
20:00:02.09 |
-16:47:31.1 |
HIP 98555 |
21.56 |
| 2026-04-07 12:00 |
20:00:05.86 |
-16:47:09.1 |
HIP 98555 |
20.63 |
| 2026-04-08 00:00 |
20:00:09.55 |
-16:46:47.4 |
HIP 98555 |
19.72 |
| 2026-04-08 12:00 |
20:00:13.16 |
-16:46:25.8 |
HIP 98555 |
18.83 |
| 2026-04-09 00:00 |
20:00:16.69 |
-16:46:04.4 |
HIP 98555 |
17.96 |
| 2026-04-09 12:00 |
20:00:20.14 |
-16:45:43.3 |
HIP 98555 |
17.12 |
| 2026-04-10 00:00 |
20:00:23.51 |
-16:45:22.3 |
HIP 98555 |
16.29 |
| 2026-04-10 12:00 |
20:00:26.79 |
-16:45:01.5 |
HIP 98555 |
15.49 |
| 2026-04-11 00:00 |
20:00:30.00 |
-16:44:41.0 |
HIP 98555 |
14.70 |
| 2026-04-11 12:00 |
20:00:33.12 |
-16:44:20.6 |
HIP 98555 |
13.95 |
| 2026-04-12 00:00 |
20:00:36.16 |
-16:44:00.5 |
HIP 98555 |
13.21 |
| 2026-04-12 12:00 |
20:00:39.12 |
-16:43:40.6 |
HIP 98555 |
12.50 |
| 2026-04-13 00:00 |
20:00:42.00 |
-16:43:20.9 |
HIP 98555 |
11.81 |
| 2026-04-13 12:00 |
20:00:44.79 |
-16:43:01.4 |
HIP 98555 |
11.15 |
| 2026-04-14 00:00 |
20:00:47.50 |
-16:42:42.1 |
HIP 98555 |
10.51 |
| 2026-04-14 12:00 |
20:00:50.13 |
-16:42:23.0 |
HIP 98555 |
9.89 |
| 2026-04-15 00:00 |
20:00:52.67 |
-16:42:04.2 |
HIP 98555 |
9.31 |
| 2026-04-15 12:00 |
20:00:55.13 |
-16:41:45.6 |
HIP 98555 |
8.75 |
| 2026-04-16 00:00 |
20:00:57.51 |
-16:41:27.2 |
HIP 98555 |
8.22 |