メタデータ
| 項目 |
値 |
| Designation |
C/2017 G3 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2017-04-15T00:45:00.587520Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:33Z |
| Obs used |
155 |
| NEO |
- |
| M1 |
14.500 |
| K1 |
9.250 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2017-05-26.0000000 |
| e |
0.99105792 |
| q (au) |
2.590476 |
| a (au) |
289.694902 |
| i (deg) |
159.051707 |
| Ω (om, deg) |
279.473026 |
| ω (w, deg) |
73.096573 |
| M (ma, deg) |
0.008189 |
等級
散乱 + 全体線形
$$
M_a = (15.149 + 3.830\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
15.149 |
| n |
3.830 |
| gf |
0.994 |
| gb |
-0.606 |
| k |
0.905 |
| δ90 |
7.745 |
| 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 |
04:38:19.03 |
+10:45:06.5 |
HIP 21676 |
16.69 |
| 2026-07-29 12:00 |
04:38:21.45 |
+10:44:56.4 |
HIP 21676 |
16.34 |
| 2026-07-30 00:00 |
04:38:23.82 |
+10:44:46.1 |
HIP 21676 |
16.01 |
| 2026-07-30 12:00 |
04:38:26.16 |
+10:44:35.8 |
HIP 21676 |
15.70 |
| 2026-07-31 00:00 |
04:38:28.47 |
+10:44:25.2 |
HIP 21676 |
15.43 |
| 2026-07-31 12:00 |
04:38:30.74 |
+10:44:14.6 |
HIP 21676 |
15.17 |
| 2026-08-01 00:00 |
04:38:32.98 |
+10:44:03.7 |
HIP 21676 |
14.94 |
| 2026-08-01 12:00 |
04:38:35.18 |
+10:43:52.8 |
HIP 21676 |
14.74 |
| 2026-08-02 00:00 |
04:38:37.35 |
+10:43:41.7 |
HIP 21676 |
14.57 |
| 2026-08-02 12:00 |
04:38:39.48 |
+10:43:30.4 |
HIP 21676 |
14.42 |
| 2026-08-03 00:00 |
04:38:41.57 |
+10:43:19.0 |
HIP 21676 |
14.30 |
| 2026-08-03 12:00 |
04:38:43.63 |
+10:43:07.4 |
HIP 21676 |
14.21 |
| 2026-08-04 00:00 |
04:38:45.65 |
+10:42:55.7 |
HIP 21676 |
14.14 |
| 2026-08-04 12:00 |
04:38:47.63 |
+10:42:43.8 |
HIP 21676 |
14.10 |
| 2026-08-05 00:00 |
04:38:49.58 |
+10:42:31.8 |
HIP 21676 |
14.08 |
| 2026-08-05 12:00 |
04:38:51.49 |
+10:42:19.7 |
HIP 21676 |
14.09 |
| 2026-08-06 00:00 |
04:38:53.36 |
+10:42:07.4 |
HIP 21676 |
14.13 |
| 2026-08-06 12:00 |
04:38:55.19 |
+10:41:55.0 |
HIP 21676 |
14.18 |
| 2026-08-07 00:00 |
04:38:56.99 |
+10:41:42.4 |
HIP 21676 |
14.26 |
| 2026-08-07 12:00 |
04:38:58.75 |
+10:41:29.7 |
HIP 21676 |
14.36 |
| 2026-08-08 00:00 |
04:39:00.47 |
+10:41:16.8 |
HIP 21676 |
14.48 |
| 2026-08-08 12:00 |
04:39:02.15 |
+10:41:03.8 |
HIP 21676 |
14.61 |
| 2026-08-09 00:00 |
04:39:03.79 |
+10:40:50.6 |
HIP 21676 |
14.76 |
| 2026-08-09 12:00 |
04:39:05.40 |
+10:40:37.3 |
HIP 21676 |
14.93 |
| 2026-08-10 00:00 |
04:39:06.96 |
+10:40:23.9 |
HIP 21676 |
15.12 |
| 2026-08-10 12:00 |
04:39:08.49 |
+10:40:10.3 |
HIP 21676 |
15.32 |
| 2026-08-11 00:00 |
04:39:09.97 |
+10:39:56.5 |
HIP 21676 |
15.53 |
| 2026-08-11 12:00 |
04:39:11.42 |
+10:39:42.7 |
HIP 21676 |
15.75 |
| 2026-08-12 00:00 |
04:39:12.82 |
+10:39:28.7 |
HIP 21663 |
15.69 |
| 2026-08-12 12:00 |
04:39:14.19 |
+10:39:14.5 |
HIP 21663 |
15.51 |
| 2026-08-13 00:00 |
04:39:15.51 |
+10:39:00.2 |
HIP 21663 |
15.33 |
| 2026-08-13 12:00 |
04:39:16.80 |
+10:38:45.8 |
HIP 21663 |
15.16 |
| 2026-08-14 00:00 |
04:39:18.04 |
+10:38:31.3 |
HIP 21663 |
14.99 |
| 2026-08-14 12:00 |
04:39:19.24 |
+10:38:16.6 |
HIP 21663 |
14.82 |
| 2026-08-15 00:00 |
04:39:20.40 |
+10:38:01.7 |
HIP 21663 |
14.66 |
| 2026-08-15 12:00 |
04:39:21.52 |
+10:37:46.8 |
HIP 21663 |
14.50 |
| 2026-08-16 00:00 |
04:39:22.60 |
+10:37:31.7 |
HIP 21663 |
14.34 |
| 2026-08-16 12:00 |
04:39:23.64 |
+10:37:16.4 |
HIP 21663 |
14.19 |
| 2026-08-17 00:00 |
04:39:24.64 |
+10:37:01.1 |
HIP 21663 |
14.03 |
| 2026-08-17 12:00 |
04:39:25.59 |
+10:36:45.6 |
HIP 21663 |
13.88 |
| 2026-08-18 00:00 |
04:39:26.50 |
+10:36:29.9 |
HIP 21663 |
13.73 |
| 2026-08-18 12:00 |
04:39:27.37 |
+10:36:14.2 |
HIP 21663 |
13.58 |
| 2026-08-19 00:00 |
04:39:28.20 |
+10:35:58.3 |
HIP 21663 |
13.43 |