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
$$
M_a = (15.161 + 3.830\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
15.161 |
| n |
3.830 |
| gf |
0.963 |
| gb |
-0.606 |
| k |
0.903 |
| δ90 |
7.076 |
| 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 |
04:22:30.94 |
+10:17:09.1 |
HIP 20318 |
25.21 |
| 2026-03-26 12:00 |
04:22:32.92 |
+10:17:25.2 |
HIP 20318 |
25.44 |
| 2026-03-27 00:00 |
04:22:34.94 |
+10:17:41.3 |
HIP 20318 |
25.69 |
| 2026-03-27 12:00 |
04:22:37.00 |
+10:17:57.4 |
HIP 20318 |
25.96 |
| 2026-03-28 00:00 |
04:22:39.09 |
+10:18:13.5 |
HIP 20318 |
26.25 |
| 2026-03-28 12:00 |
04:22:41.23 |
+10:18:29.6 |
HIP 20318 |
26.55 |
| 2026-03-29 00:00 |
04:22:43.40 |
+10:18:45.7 |
HIP 20318 |
26.88 |
| 2026-03-29 12:00 |
04:22:45.60 |
+10:19:01.9 |
HIP 20318 |
27.21 |
| 2026-03-30 00:00 |
04:22:47.85 |
+10:19:18.0 |
HIP 20318 |
27.57 |
| 2026-03-30 12:00 |
04:22:50.13 |
+10:19:34.2 |
HIP 20318 |
27.94 |
| 2026-03-31 00:00 |
04:22:52.45 |
+10:19:50.4 |
HIP 20318 |
28.33 |
| 2026-03-31 12:00 |
04:22:54.81 |
+10:20:06.5 |
HIP 20318 |
28.74 |
| 2026-04-01 00:00 |
04:22:57.20 |
+10:20:22.7 |
HIP 20318 |
29.16 |
| 2026-04-01 12:00 |
04:22:59.63 |
+10:20:38.9 |
HIP 20481 |
29.12 |
| 2026-04-02 00:00 |
04:23:02.10 |
+10:20:55.1 |
HIP 20481 |
28.74 |
| 2026-04-02 12:00 |
04:23:04.60 |
+10:21:11.3 |
HIP 20481 |
28.37 |
| 2026-04-03 00:00 |
04:23:07.13 |
+10:21:27.5 |
HIP 20481 |
28.01 |
| 2026-04-03 12:00 |
04:23:09.70 |
+10:21:43.7 |
HIP 20481 |
27.67 |
| 2026-04-04 00:00 |
04:23:12.31 |
+10:21:59.8 |
HIP 20481 |
27.33 |
| 2026-04-04 12:00 |
04:23:14.95 |
+10:22:16.0 |
HIP 20481 |
27.01 |
| 2026-04-05 00:00 |
04:23:17.62 |
+10:22:32.2 |
HIP 20481 |
26.70 |
| 2026-04-05 12:00 |
04:23:20.33 |
+10:22:48.4 |
HIP 20481 |
26.41 |
| 2026-04-06 00:00 |
04:23:23.07 |
+10:23:04.5 |
HIP 20481 |
26.14 |
| 2026-04-06 12:00 |
04:23:25.85 |
+10:23:20.7 |
HIP 20481 |
25.88 |
| 2026-04-07 00:00 |
04:23:28.66 |
+10:23:36.8 |
HIP 20481 |
25.64 |
| 2026-04-07 12:00 |
04:23:31.50 |
+10:23:52.9 |
HIP 20481 |
25.42 |
| 2026-04-08 00:00 |
04:23:34.37 |
+10:24:09.0 |
HIP 20481 |
25.23 |
| 2026-04-08 12:00 |
04:23:37.28 |
+10:24:25.1 |
HIP 20481 |
25.05 |
| 2026-04-09 00:00 |
04:23:40.22 |
+10:24:41.2 |
HIP 20481 |
24.90 |
| 2026-04-09 12:00 |
04:23:43.19 |
+10:24:57.3 |
HIP 20481 |
24.78 |
| 2026-04-10 00:00 |
04:23:46.20 |
+10:25:13.3 |
HIP 20481 |
24.68 |
| 2026-04-10 12:00 |
04:23:49.23 |
+10:25:29.3 |
HIP 20481 |
24.61 |
| 2026-04-11 00:00 |
04:23:52.30 |
+10:25:45.3 |
HIP 20481 |
24.56 |
| 2026-04-11 12:00 |
04:23:55.40 |
+10:26:01.3 |
HIP 20481 |
24.55 |
| 2026-04-12 00:00 |
04:23:58.53 |
+10:26:17.3 |
HIP 20481 |
24.56 |
| 2026-04-12 12:00 |
04:24:01.69 |
+10:26:33.2 |
HIP 20481 |
24.61 |
| 2026-04-13 00:00 |
04:24:04.87 |
+10:26:49.1 |
HIP 20481 |
24.68 |
| 2026-04-13 12:00 |
04:24:08.09 |
+10:27:04.9 |
HIP 20481 |
24.79 |
| 2026-04-14 00:00 |
04:24:11.34 |
+10:27:20.8 |
HIP 20481 |
24.93 |
| 2026-04-14 12:00 |
04:24:14.62 |
+10:27:36.6 |
HIP 20481 |
25.10 |
| 2026-04-15 00:00 |
04:24:17.93 |
+10:27:52.4 |
HIP 20481 |
25.30 |
| 2026-04-15 12:00 |
04:24:21.26 |
+10:28:08.1 |
HIP 20481 |
25.53 |
| 2026-04-16 00:00 |
04:24:24.63 |
+10:28:23.8 |
HIP 20481 |
25.79 |