C/2015 J1 (PANSTARRS)
メタデータ
| 項目 |
値 |
| Designation |
C/2015 J1 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2014-06-29T23:13:39.259200Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:10Z |
| Obs used |
54 |
| NEO |
- |
| M1 |
7.500 |
| K1 |
11.250 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2015-08-08.0000000 |
| e |
1.00318272 |
| q (au) |
6.019565 |
| a (au) |
-1891.328665 |
| i (deg) |
94.998299 |
| Ω (om, deg) |
219.992187 |
| ω (w, deg) |
315.467882 |
| M (ma, deg) |
0.004841 |
等級
散乱 + 全体線形
$$
M_a = (5.428 + 5.041\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
5.428 |
| n |
5.041 |
| gf |
1.000 |
| gb |
-0.998 |
| k |
1.000 |
| 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) |
| 2026-02-03 00:00 |
16:25:53.46 |
+57:03:17.9 |
HIP 80690 |
28.92 |
| 2026-02-03 12:00 |
16:25:57.75 |
+57:04:32.9 |
HIP 80690 |
29.33 |
| 2026-02-04 00:00 |
16:26:01.98 |
+57:05:48.3 |
HIP 80775 |
29.64 |
| 2026-02-04 12:00 |
16:26:06.14 |
+57:07:03.9 |
HIP 80775 |
28.78 |
| 2026-02-05 00:00 |
16:26:10.23 |
+57:08:19.7 |
HIP 80775 |
27.97 |
| 2026-02-05 12:00 |
16:26:14.25 |
+57:09:35.9 |
HIP 80775 |
27.22 |
| 2026-02-06 00:00 |
16:26:18.21 |
+57:10:52.2 |
HIP 80775 |
26.53 |
| 2026-02-06 12:00 |
16:26:22.10 |
+57:12:08.8 |
HIP 80775 |
25.90 |
| 2026-02-07 00:00 |
16:26:25.91 |
+57:13:25.7 |
HIP 80775 |
25.35 |
| 2026-02-07 12:00 |
16:26:29.66 |
+57:14:42.8 |
HIP 80775 |
24.87 |
| 2026-02-08 00:00 |
16:26:33.34 |
+57:16:00.1 |
HIP 80775 |
24.46 |
| 2026-02-08 12:00 |
16:26:36.95 |
+57:17:17.6 |
HIP 80775 |
24.14 |
| 2026-02-09 00:00 |
16:26:40.49 |
+57:18:35.4 |
HIP 80775 |
23.91 |
| 2026-02-09 12:00 |
16:26:43.96 |
+57:19:53.4 |
HIP 80775 |
23.76 |
| 2026-02-10 00:00 |
16:26:47.35 |
+57:21:11.6 |
HIP 80775 |
23.71 |
| 2026-02-10 12:00 |
16:26:50.68 |
+57:22:30.0 |
HIP 80775 |
23.75 |
| 2026-02-11 00:00 |
16:26:53.93 |
+57:23:48.6 |
HIP 80775 |
23.88 |
| 2026-02-11 12:00 |
16:26:57.11 |
+57:25:07.4 |
HIP 80775 |
24.09 |
| 2026-02-12 00:00 |
16:27:00.22 |
+57:26:26.4 |
HIP 80775 |
24.40 |
| 2026-02-12 12:00 |
16:27:03.26 |
+57:27:45.6 |
HIP 80775 |
24.78 |
| 2026-02-13 00:00 |
16:27:06.22 |
+57:29:05.0 |
HIP 80775 |
25.25 |
| 2026-02-13 12:00 |
16:27:09.11 |
+57:30:24.5 |
HIP 80775 |
25.80 |
| 2026-02-14 00:00 |
16:27:11.92 |
+57:31:44.2 |
HIP 80775 |
26.41 |
| 2026-02-14 12:00 |
16:27:14.66 |
+57:33:04.1 |
HIP 80775 |
27.09 |
| 2026-02-15 00:00 |
16:27:17.33 |
+57:34:24.1 |
HIP 80775 |
27.83 |
| 2026-02-15 12:00 |
16:27:19.92 |
+57:35:44.3 |
HIP 80775 |
28.63 |
| 2026-02-16 00:00 |
16:27:22.43 |
+57:37:04.7 |
HIP 80775 |
29.47 |
| 2026-02-16 12:00 |
16:27:24.88 |
+57:38:25.2 |
HIP 80775 |
30.37 |
| 2026-02-17 00:00 |
16:27:27.24 |
+57:39:45.8 |
HIP 80775 |
31.31 |
| 2026-02-17 12:00 |
16:27:29.53 |
+57:41:06.5 |
HIP 80906 |
32.10 |
| 2026-02-18 00:00 |
16:27:31.74 |
+57:42:27.4 |
HIP 80906 |
31.45 |
| 2026-02-18 12:00 |
16:27:33.88 |
+57:43:48.4 |
HIP 80906 |
30.85 |
| 2026-02-19 00:00 |
16:27:35.94 |
+57:45:09.6 |
HIP 80566 |
29.90 |
| 2026-02-19 12:00 |
16:27:37.92 |
+57:46:30.8 |
HIP 80566 |
28.61 |
| 2026-02-20 00:00 |
16:27:39.83 |
+57:47:52.1 |
HIP 80689 |
27.25 |
| 2026-02-20 12:00 |
16:27:41.66 |
+57:49:13.5 |
HIP 80689 |
25.88 |
| 2026-02-21 00:00 |
16:27:43.41 |
+57:50:35.0 |
HIP 80689 |
24.50 |
| 2026-02-21 12:00 |
16:27:45.08 |
+57:51:56.6 |
HIP 80689 |
23.13 |
| 2026-02-22 00:00 |
16:27:46.67 |
+57:53:18.3 |
HIP 80689 |
21.76 |
| 2026-02-22 12:00 |
16:27:48.19 |
+57:54:40.1 |
HIP 80689 |
20.39 |
| 2026-02-23 00:00 |
16:27:49.63 |
+57:56:01.9 |
HIP 80689 |
19.03 |
| 2026-02-23 12:00 |
16:27:50.99 |
+57:57:23.8 |
HIP 80689 |
17.67 |
| 2026-02-24 00:00 |
16:27:52.27 |
+57:58:45.7 |
HIP 80689 |
16.31 |