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) |
| 2026-05-12 00:00 |
20:01:03.23 |
-16:31:05.5 |
HIP 98555 |
3.69 |
| 2026-05-12 12:00 |
20:01:01.07 |
-16:31:00.4 |
HIP 98555 |
4.09 |
| 2026-05-13 00:00 |
20:00:58.82 |
-16:30:55.5 |
HIP 98555 |
4.52 |
| 2026-05-13 12:00 |
20:00:56.48 |
-16:30:50.9 |
HIP 98555 |
4.99 |
| 2026-05-14 00:00 |
20:00:54.06 |
-16:30:46.6 |
HIP 98555 |
5.49 |
| 2026-05-14 12:00 |
20:00:51.56 |
-16:30:42.5 |
HIP 98555 |
6.02 |
| 2026-05-15 00:00 |
20:00:48.97 |
-16:30:38.8 |
HIP 98555 |
6.58 |
| 2026-05-15 12:00 |
20:00:46.29 |
-16:30:35.2 |
HIP 98555 |
7.16 |
| 2026-05-16 00:00 |
20:00:43.53 |
-16:30:32.0 |
HIP 98555 |
7.77 |
| 2026-05-16 12:00 |
20:00:40.69 |
-16:30:29.0 |
HIP 98555 |
8.40 |
| 2026-05-17 00:00 |
20:00:37.77 |
-16:30:26.3 |
HIP 98555 |
9.06 |
| 2026-05-17 12:00 |
20:00:34.76 |
-16:30:23.9 |
HIP 98555 |
9.74 |
| 2026-05-18 00:00 |
20:00:31.66 |
-16:30:21.7 |
HIP 98555 |
10.45 |
| 2026-05-18 12:00 |
20:00:28.49 |
-16:30:19.9 |
HIP 98555 |
11.17 |
| 2026-05-19 00:00 |
20:00:25.23 |
-16:30:18.2 |
HIP 98555 |
11.92 |
| 2026-05-19 12:00 |
20:00:21.89 |
-16:30:16.9 |
HIP 98555 |
12.69 |
| 2026-05-20 00:00 |
20:00:18.46 |
-16:30:15.8 |
HIP 98555 |
13.48 |
| 2026-05-20 12:00 |
20:00:14.96 |
-16:30:15.0 |
HIP 98555 |
14.29 |
| 2026-05-21 00:00 |
20:00:11.37 |
-16:30:14.5 |
HIP 98555 |
15.12 |
| 2026-05-21 12:00 |
20:00:07.70 |
-16:30:14.2 |
HIP 98555 |
15.98 |
| 2026-05-22 00:00 |
20:00:03.95 |
-16:30:14.2 |
HIP 98555 |
16.85 |
| 2026-05-22 12:00 |
20:00:00.12 |
-16:30:14.5 |
HIP 98555 |
17.74 |
| 2026-05-23 00:00 |
19:59:56.22 |
-16:30:15.0 |
HIP 98555 |
18.66 |
| 2026-05-23 12:00 |
19:59:52.23 |
-16:30:15.8 |
HIP 98555 |
19.59 |
| 2026-05-24 00:00 |
19:59:48.16 |
-16:30:16.8 |
HIP 98555 |
20.55 |
| 2026-05-24 12:00 |
19:59:44.01 |
-16:30:18.2 |
HIP 98555 |
21.52 |
| 2026-05-25 00:00 |
19:59:39.79 |
-16:30:19.8 |
HIP 98555 |
22.51 |
| 2026-05-25 12:00 |
19:59:35.48 |
-16:30:21.6 |
HIP 98555 |
23.53 |
| 2026-05-26 00:00 |
19:59:31.10 |
-16:30:23.7 |
HIP 98555 |
24.56 |
| 2026-05-26 12:00 |
19:59:26.64 |
-16:30:26.1 |
HIP 98555 |
25.61 |
| 2026-05-27 00:00 |
19:59:22.11 |
-16:30:28.7 |
HIP 98555 |
26.68 |
| 2026-05-27 12:00 |
19:59:17.49 |
-16:30:31.6 |
HIP 98555 |
27.77 |
| 2026-05-28 00:00 |
19:59:12.81 |
-16:30:34.8 |
HIP 98555 |
28.88 |
| 2026-05-28 12:00 |
19:59:08.04 |
-16:30:38.2 |
HIP 98555 |
30.01 |
| 2026-05-29 00:00 |
19:59:03.20 |
-16:30:41.9 |
HIP 98555 |
31.15 |
| 2026-05-29 12:00 |
19:58:58.29 |
-16:30:45.8 |
HIP 98150 |
31.72 |
| 2026-05-30 00:00 |
19:58:53.30 |
-16:30:50.0 |
HIP 98150 |
30.53 |
| 2026-05-30 12:00 |
19:58:48.23 |
-16:30:54.5 |
HIP 98150 |
29.33 |
| 2026-05-31 00:00 |
19:58:43.09 |
-16:30:59.2 |
HIP 98150 |
28.11 |
| 2026-05-31 12:00 |
19:58:37.88 |
-16:31:04.1 |
HIP 98150 |
26.87 |
| 2026-06-01 00:00 |
19:58:32.60 |
-16:31:09.3 |
HIP 98150 |
25.62 |
| 2026-06-01 12:00 |
19:58:27.24 |
-16:31:14.8 |
HIP 98150 |
24.35 |
| 2026-06-02 00:00 |
19:58:21.81 |
-16:31:20.5 |
HIP 98150 |
23.06 |