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) |
| 2026-07-29 00:00 |
02:19:02.90 |
+06:01:11.5 |
HIP 10957 |
36.80 |
| 2026-07-29 12:00 |
02:19:03.43 |
+06:01:06.9 |
HIP 10957 |
36.64 |
| 2026-07-30 00:00 |
02:19:03.92 |
+06:01:02.0 |
HIP 10957 |
36.50 |
| 2026-07-30 12:00 |
02:19:04.37 |
+06:00:57.0 |
HIP 10957 |
36.36 |
| 2026-07-31 00:00 |
02:19:04.79 |
+06:00:51.7 |
HIP 10957 |
36.22 |
| 2026-07-31 12:00 |
02:19:05.16 |
+06:00:46.3 |
HIP 10957 |
36.10 |
| 2026-08-01 00:00 |
02:19:05.50 |
+06:00:40.6 |
HIP 10957 |
35.98 |
| 2026-08-01 12:00 |
02:19:05.79 |
+06:00:34.8 |
HIP 10957 |
35.86 |
| 2026-08-02 00:00 |
02:19:06.05 |
+06:00:28.7 |
HIP 10957 |
35.75 |
| 2026-08-02 12:00 |
02:19:06.27 |
+06:00:22.5 |
HIP 10957 |
35.65 |
| 2026-08-03 00:00 |
02:19:06.44 |
+06:00:16.0 |
HIP 10957 |
35.56 |
| 2026-08-03 12:00 |
02:19:06.58 |
+06:00:09.3 |
HIP 10957 |
35.47 |
| 2026-08-04 00:00 |
02:19:06.68 |
+06:00:02.5 |
HIP 10957 |
35.39 |
| 2026-08-04 12:00 |
02:19:06.74 |
+05:59:55.4 |
HIP 10957 |
35.32 |
| 2026-08-05 00:00 |
02:19:06.76 |
+05:59:48.1 |
HIP 10957 |
35.25 |
| 2026-08-05 12:00 |
02:19:06.74 |
+05:59:40.7 |
HIP 10957 |
35.19 |
| 2026-08-06 00:00 |
02:19:06.68 |
+05:59:33.0 |
HIP 10957 |
35.14 |
| 2026-08-06 12:00 |
02:19:06.58 |
+05:59:25.1 |
HIP 10957 |
35.09 |
| 2026-08-07 00:00 |
02:19:06.44 |
+05:59:17.1 |
HIP 10957 |
35.05 |
| 2026-08-07 12:00 |
02:19:06.26 |
+05:59:08.8 |
HIP 10957 |
35.02 |
| 2026-08-08 00:00 |
02:19:06.04 |
+05:59:00.4 |
HIP 10957 |
35.00 |
| 2026-08-08 12:00 |
02:19:05.78 |
+05:58:51.7 |
HIP 10957 |
34.98 |
| 2026-08-09 00:00 |
02:19:05.49 |
+05:58:42.9 |
HIP 10957 |
34.97 |
| 2026-08-09 12:00 |
02:19:05.15 |
+05:58:33.8 |
HIP 10957 |
34.97 |
| 2026-08-10 00:00 |
02:19:04.77 |
+05:58:24.6 |
HIP 10957 |
34.98 |
| 2026-08-10 12:00 |
02:19:04.35 |
+05:58:15.2 |
HIP 10957 |
34.99 |
| 2026-08-11 00:00 |
02:19:03.90 |
+05:58:05.6 |
HIP 10957 |
35.02 |
| 2026-08-11 12:00 |
02:19:03.40 |
+05:57:55.8 |
HIP 10957 |
35.05 |
| 2026-08-12 00:00 |
02:19:02.86 |
+05:57:45.8 |
HIP 10957 |
35.09 |
| 2026-08-12 12:00 |
02:19:02.29 |
+05:57:35.6 |
HIP 10957 |
35.14 |
| 2026-08-13 00:00 |
02:19:01.67 |
+05:57:25.2 |
HIP 10957 |
35.20 |
| 2026-08-13 12:00 |
02:19:01.01 |
+05:57:14.6 |
HIP 10957 |
35.26 |
| 2026-08-14 00:00 |
02:19:00.32 |
+05:57:03.9 |
HIP 10957 |
35.34 |
| 2026-08-14 12:00 |
02:18:59.58 |
+05:56:53.0 |
HIP 10678 |
35.19 |
| 2026-08-15 00:00 |
02:18:58.81 |
+05:56:41.9 |
HIP 10678 |
34.92 |
| 2026-08-15 12:00 |
02:18:58.00 |
+05:56:30.6 |
HIP 10678 |
34.64 |
| 2026-08-16 00:00 |
02:18:57.14 |
+05:56:19.1 |
HIP 10678 |
34.36 |
| 2026-08-16 12:00 |
02:18:56.25 |
+05:56:07.4 |
HIP 10678 |
34.07 |
| 2026-08-17 00:00 |
02:18:55.32 |
+05:55:55.6 |
HIP 10678 |
33.76 |
| 2026-08-17 12:00 |
02:18:54.35 |
+05:55:43.6 |
HIP 10678 |
33.45 |
| 2026-08-18 00:00 |
02:18:53.34 |
+05:55:31.4 |
HIP 10678 |
33.13 |
| 2026-08-18 12:00 |
02:18:52.29 |
+05:55:19.0 |
HIP 10678 |
32.81 |
| 2026-08-19 00:00 |
02:18:51.21 |
+05:55:06.5 |
HIP 10678 |
32.47 |