メタデータ
| 項目 |
値 |
| Designation |
C/2016 S1 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2017-03-16T19:29:49.666560Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:26Z |
| Obs used |
127 |
| NEO |
- |
| M1 |
5.700 |
| K1 |
24.000 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2016-11-07.0000000 |
| e |
0.70884778 |
| q (au) |
2.411908 |
| a (au) |
8.284009 |
| i (deg) |
94.689671 |
| Ω (om, deg) |
227.538223 |
| ω (w, deg) |
273.611282 |
| M (ma, deg) |
354.633893 |
等級
散乱 + 全体線形
$$
M_a = (9.502 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
9.502 |
| n |
6.000 |
| gf |
0.926 |
| gb |
-0.858 |
| k |
0.992 |
| δ90 |
8.697 |
| 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 |
17:19:39.62 |
+64:08:49.6 |
HIP 84602 |
14.96 |
| 2026-03-26 12:00 |
17:19:36.41 |
+64:11:14.4 |
HIP 84602 |
15.91 |
| 2026-03-27 00:00 |
17:19:33.02 |
+64:13:38.8 |
HIP 84569 |
17.03 |
| 2026-03-27 12:00 |
17:19:29.46 |
+64:16:03.0 |
HIP 84569 |
18.04 |
| 2026-03-28 00:00 |
17:19:25.71 |
+64:18:26.8 |
HIP 84569 |
19.29 |
| 2026-03-28 12:00 |
17:19:21.79 |
+64:20:50.3 |
HIP 84925 |
19.19 |
| 2026-03-29 00:00 |
17:19:17.69 |
+64:23:13.4 |
HIP 84925 |
17.80 |
| 2026-03-29 12:00 |
17:19:13.42 |
+64:25:36.2 |
HIP 84925 |
16.67 |
| 2026-03-30 00:00 |
17:19:08.96 |
+64:27:58.6 |
HIP 84925 |
15.85 |
| 2026-03-30 12:00 |
17:19:04.33 |
+64:30:20.7 |
HIP 84825 |
14.59 |
| 2026-03-31 00:00 |
17:18:59.52 |
+64:32:42.3 |
HIP 84825 |
12.89 |
| 2026-03-31 12:00 |
17:18:54.53 |
+64:35:03.6 |
HIP 84825 |
11.47 |
| 2026-04-01 00:00 |
17:18:49.36 |
+64:37:24.5 |
HIP 84825 |
10.44 |
| 2026-04-01 12:00 |
17:18:44.01 |
+64:39:44.9 |
HIP 84825 |
9.92 |
| 2026-04-02 00:00 |
17:18:38.48 |
+64:42:04.9 |
HIP 84825 |
9.99 |
| 2026-04-02 12:00 |
17:18:32.78 |
+64:44:24.5 |
HIP 84825 |
10.64 |
| 2026-04-03 00:00 |
17:18:26.89 |
+64:46:43.7 |
HIP 84825 |
11.77 |
| 2026-04-03 12:00 |
17:18:20.83 |
+64:49:02.4 |
HIP 84825 |
13.25 |
| 2026-04-04 00:00 |
17:18:14.58 |
+64:51:20.6 |
HIP 84825 |
14.99 |
| 2026-04-04 12:00 |
17:18:08.16 |
+64:53:38.3 |
HIP 84825 |
16.89 |
| 2026-04-05 00:00 |
17:18:01.56 |
+64:55:55.6 |
HIP 84825 |
18.92 |
| 2026-04-05 12:00 |
17:17:54.77 |
+64:58:12.4 |
HIP 84825 |
21.03 |
| 2026-04-06 00:00 |
17:17:47.81 |
+65:00:28.7 |
HIP 84825 |
23.20 |
| 2026-04-06 12:00 |
17:17:40.67 |
+65:02:44.4 |
HIP 84825 |
25.41 |
| 2026-04-07 00:00 |
17:17:33.34 |
+65:04:59.7 |
HIP 84825 |
27.65 |
| 2026-04-07 12:00 |
17:17:25.84 |
+65:07:14.4 |
HIP 84362 |
28.33 |
| 2026-04-08 00:00 |
17:17:18.16 |
+65:09:28.6 |
HIP 84362 |
26.03 |
| 2026-04-08 12:00 |
17:17:10.30 |
+65:11:42.2 |
HIP 84362 |
23.76 |
| 2026-04-09 00:00 |
17:17:02.26 |
+65:13:55.2 |
HIP 84362 |
21.50 |
| 2026-04-09 12:00 |
17:16:54.04 |
+65:16:07.7 |
HIP 84362 |
19.26 |
| 2026-04-10 00:00 |
17:16:45.64 |
+65:18:19.6 |
HIP 84362 |
17.05 |
| 2026-04-10 12:00 |
17:16:37.06 |
+65:20:30.9 |
HIP 84362 |
14.89 |
| 2026-04-11 00:00 |
17:16:28.31 |
+65:22:41.5 |
HIP 84362 |
12.80 |
| 2026-04-11 12:00 |
17:16:19.37 |
+65:24:51.6 |
HIP 84362 |
10.80 |
| 2026-04-12 00:00 |
17:16:10.26 |
+65:27:01.0 |
HIP 84362 |
8.97 |
| 2026-04-12 12:00 |
17:16:00.97 |
+65:29:09.8 |
HIP 84362 |
7.43 |
| 2026-04-13 00:00 |
17:15:51.50 |
+65:31:18.0 |
HIP 84362 |
6.38 |
| 2026-04-13 12:00 |
17:15:41.85 |
+65:33:25.5 |
HIP 84362 |
6.10 |
| 2026-04-14 00:00 |
17:15:32.03 |
+65:35:32.3 |
HIP 84362 |
6.66 |
| 2026-04-14 12:00 |
17:15:22.02 |
+65:37:38.4 |
HIP 84362 |
7.89 |
| 2026-04-15 00:00 |
17:15:11.85 |
+65:39:43.9 |
HIP 84362 |
9.54 |
| 2026-04-15 12:00 |
17:15:01.49 |
+65:41:48.6 |
HIP 84362 |
11.41 |
| 2026-04-16 00:00 |
17:14:50.96 |
+65:43:52.7 |
HIP 84362 |
13.42 |