メタデータ
| 項目 |
値 |
| Designation |
C/2015 J2 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2015-09-08T21:55:57.529920Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:10Z |
| Obs used |
99 |
| NEO |
- |
| M1 |
7.200 |
| K1 |
14.500 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2015-07-15.0000000 |
| e |
0.98250509 |
| q (au) |
4.320386 |
| a (au) |
246.951051 |
| i (deg) |
17.281830 |
| Ω (om, deg) |
56.755871 |
| ω (w, deg) |
203.688946 |
| M (ma, deg) |
359.985799 |
等級
散乱 + 全体線形
$$
M_a = (16.150 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
16.150 |
| n |
2.000 |
| gf |
0.999 |
| gb |
-0.722 |
| k |
0.800 |
| δ90 |
9.999 |
| 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) |
| 2026-06-01 00:00 |
02:14:02.86 |
+05:46:19.0 |
HIP 10419 |
14.61 |
| 2026-06-01 12:00 |
02:14:07.10 |
+05:46:38.3 |
HIP 10419 |
14.10 |
| 2026-06-02 00:00 |
02:14:11.33 |
+05:46:57.4 |
HIP 10419 |
13.67 |
| 2026-06-02 12:00 |
02:14:15.53 |
+05:47:16.3 |
HIP 10419 |
13.31 |
| 2026-06-03 00:00 |
02:14:19.71 |
+05:47:35.0 |
HIP 10419 |
13.04 |
| 2026-06-03 12:00 |
02:14:23.87 |
+05:47:53.5 |
HIP 10419 |
12.86 |
| 2026-06-04 00:00 |
02:14:28.01 |
+05:48:11.9 |
HIP 10419 |
12.77 |
| 2026-06-04 12:00 |
02:14:32.13 |
+05:48:30.1 |
HIP 10419 |
12.77 |
| 2026-06-05 00:00 |
02:14:36.22 |
+05:48:48.1 |
HIP 10419 |
12.86 |
| 2026-06-05 12:00 |
02:14:40.29 |
+05:49:05.9 |
HIP 10419 |
13.03 |
| 2026-06-06 00:00 |
02:14:44.34 |
+05:49:23.5 |
HIP 10419 |
13.29 |
| 2026-06-06 12:00 |
02:14:48.37 |
+05:49:40.9 |
HIP 10419 |
13.62 |
| 2026-06-07 00:00 |
02:14:52.37 |
+05:49:58.2 |
HIP 10419 |
14.02 |
| 2026-06-07 12:00 |
02:14:56.35 |
+05:50:15.3 |
HIP 10419 |
14.48 |
| 2026-06-08 00:00 |
02:15:00.30 |
+05:50:32.1 |
HIP 10419 |
15.00 |
| 2026-06-08 12:00 |
02:15:04.24 |
+05:50:48.8 |
HIP 10419 |
15.56 |
| 2026-06-09 00:00 |
02:15:08.14 |
+05:51:05.3 |
HIP 10419 |
16.17 |
| 2026-06-09 12:00 |
02:15:12.03 |
+05:51:21.6 |
HIP 10419 |
16.81 |
| 2026-06-10 00:00 |
02:15:15.89 |
+05:51:37.7 |
HIP 10419 |
17.48 |
| 2026-06-10 12:00 |
02:15:19.72 |
+05:51:53.7 |
HIP 10419 |
18.18 |
| 2026-06-11 00:00 |
02:15:23.53 |
+05:52:09.4 |
HIP 10448 |
18.57 |
| 2026-06-11 12:00 |
02:15:27.31 |
+05:52:24.9 |
HIP 10448 |
18.93 |
| 2026-06-12 00:00 |
02:15:31.07 |
+05:52:40.3 |
HIP 10448 |
19.34 |
| 2026-06-12 12:00 |
02:15:34.80 |
+05:52:55.4 |
HIP 10448 |
19.79 |
| 2026-06-13 00:00 |
02:15:38.51 |
+05:53:10.3 |
HIP 10448 |
20.27 |
| 2026-06-13 12:00 |
02:15:42.19 |
+05:53:25.1 |
HIP 10448 |
20.78 |
| 2026-06-14 00:00 |
02:15:45.84 |
+05:53:39.6 |
HIP 10448 |
21.31 |
| 2026-06-14 12:00 |
02:15:49.46 |
+05:53:54.0 |
HIP 10448 |
21.87 |
| 2026-06-15 00:00 |
02:15:53.06 |
+05:54:08.1 |
HIP 10448 |
22.45 |
| 2026-06-15 12:00 |
02:15:56.63 |
+05:54:22.1 |
HIP 10448 |
23.05 |
| 2026-06-16 00:00 |
02:16:00.18 |
+05:54:35.8 |
HIP 10448 |
23.67 |
| 2026-06-16 12:00 |
02:16:03.69 |
+05:54:49.4 |
HIP 10448 |
24.30 |
| 2026-06-17 00:00 |
02:16:07.18 |
+05:55:02.7 |
HIP 10448 |
24.94 |
| 2026-06-17 12:00 |
02:16:10.64 |
+05:55:15.8 |
HIP 10448 |
25.60 |
| 2026-06-18 00:00 |
02:16:14.07 |
+05:55:28.8 |
HIP 10448 |
26.26 |
| 2026-06-18 12:00 |
02:16:17.48 |
+05:55:41.5 |
HIP 10448 |
26.93 |
| 2026-06-19 00:00 |
02:16:20.85 |
+05:55:54.0 |
HIP 10448 |
27.60 |
| 2026-06-19 12:00 |
02:16:24.19 |
+05:56:06.3 |
HIP 10448 |
28.28 |
| 2026-06-20 00:00 |
02:16:27.51 |
+05:56:18.5 |
HIP 10678 |
28.67 |
| 2026-06-20 12:00 |
02:16:30.80 |
+05:56:30.4 |
HIP 10678 |
28.46 |
| 2026-06-21 00:00 |
02:16:34.05 |
+05:56:42.1 |
HIP 10678 |
28.28 |
| 2026-06-21 12:00 |
02:16:37.28 |
+05:56:53.6 |
HIP 10678 |
28.12 |
| 2026-06-22 00:00 |
02:16:40.48 |
+05:57:04.9 |
HIP 10678 |
27.98 |