P/2015 R2 (PANSTARRS)
メタデータ
| 項目 |
値 |
| Designation |
P/2015 R2 (PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2015-06-08T04:48:20.191680Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:14Z |
| Obs used |
24 |
| NEO |
- |
| M1 |
15.600 |
| K1 |
10.000 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2015-09-13.0000000 |
| e |
0.45202974 |
| q (au) |
2.473558 |
| a (au) |
4.514038 |
| i (deg) |
15.551673 |
| Ω (om, deg) |
168.668252 |
| ω (w, deg) |
149.648582 |
| M (ma, deg) |
9.947882 |
等級
散乱 + 全体線形
$$
M_a = (16.425 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
16.425 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.705 |
| 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 |
02:19:56.82 |
-00:12:25.6 |
HIP 10930 |
13.02 |
| 2026-02-03 12:00 |
02:20:18.26 |
-00:09:27.6 |
HIP 10930 |
9.53 |
| 2026-02-04 00:00 |
02:20:39.85 |
-00:06:29.3 |
HIP 10930 |
9.35 |
| 2026-02-04 12:00 |
02:21:01.59 |
-00:03:30.7 |
HIP 10930 |
12.66 |
| 2026-02-05 00:00 |
02:21:23.48 |
-00:00:31.8 |
HIP 10930 |
17.62 |
| 2026-02-05 12:00 |
02:21:45.53 |
+00:02:27.4 |
HIP 11062 |
13.00 |
| 2026-02-06 00:00 |
02:22:07.72 |
+00:05:26.9 |
HIP 11062 |
7.15 |
| 2026-02-06 12:00 |
02:22:30.06 |
+00:08:26.5 |
HIP 11062 |
3.60 |
| 2026-02-07 00:00 |
02:22:52.55 |
+00:11:26.5 |
HIP 11062 |
7.46 |
| 2026-02-07 12:00 |
02:23:15.19 |
+00:14:26.6 |
HIP 11062 |
13.44 |
| 2026-02-08 00:00 |
02:23:37.97 |
+00:17:27.0 |
HIP 11062 |
19.72 |
| 2026-02-08 12:00 |
02:24:00.89 |
+00:20:27.6 |
HIP 11269 |
24.40 |
| 2026-02-09 00:00 |
02:24:23.96 |
+00:23:28.4 |
HIP 11269 |
18.37 |
| 2026-02-09 12:00 |
02:24:47.17 |
+00:26:29.4 |
HIP 11269 |
12.80 |
| 2026-02-10 00:00 |
02:25:10.52 |
+00:29:30.6 |
HIP 11290 |
7.51 |
| 2026-02-10 12:00 |
02:25:34.01 |
+00:32:31.9 |
HIP 11290 |
4.09 |
| 2026-02-11 00:00 |
02:25:57.64 |
+00:35:33.4 |
HIP 11290 |
8.05 |
| 2026-02-11 12:00 |
02:26:21.41 |
+00:38:35.0 |
HIP 11290 |
14.21 |
| 2026-02-12 00:00 |
02:26:45.31 |
+00:41:36.8 |
HIP 11290 |
20.72 |
| 2026-02-12 12:00 |
02:27:09.35 |
+00:44:38.7 |
HIP 11290 |
27.36 |
| 2026-02-13 00:00 |
02:27:33.52 |
+00:47:40.8 |
HIP 11587 |
26.64 |
| 2026-02-13 12:00 |
02:27:57.83 |
+00:50:42.9 |
HIP 11587 |
20.89 |
| 2026-02-14 00:00 |
02:28:22.27 |
+00:53:45.2 |
HIP 11587 |
15.96 |
| 2026-02-14 12:00 |
02:28:46.84 |
+00:56:47.5 |
HIP 11587 |
12.86 |
| 2026-02-15 00:00 |
02:29:11.54 |
+00:59:49.9 |
HIP 11587 |
13.04 |
| 2026-02-15 12:00 |
02:29:36.37 |
+01:02:52.4 |
HIP 11587 |
16.42 |
| 2026-02-16 00:00 |
02:30:01.33 |
+01:05:55.0 |
HIP 11587 |
21.57 |
| 2026-02-16 12:00 |
02:30:26.41 |
+01:08:57.5 |
HIP 11736 |
16.10 |
| 2026-02-17 00:00 |
02:30:51.62 |
+01:12:00.2 |
HIP 11736 |
11.45 |
| 2026-02-17 12:00 |
02:31:16.96 |
+01:15:02.8 |
HIP 11737 |
9.93 |
| 2026-02-18 00:00 |
02:31:42.42 |
+01:18:05.5 |
HIP 11737 |
12.82 |
| 2026-02-18 12:00 |
02:32:08.00 |
+01:21:08.2 |
HIP 11720 |
16.15 |
| 2026-02-19 00:00 |
02:32:33.70 |
+01:24:10.9 |
HIP 11853 |
16.91 |
| 2026-02-19 12:00 |
02:32:59.52 |
+01:27:13.6 |
HIP 11853 |
12.62 |
| 2026-02-20 00:00 |
02:33:25.47 |
+01:30:16.2 |
HIP 11853 |
11.61 |
| 2026-02-20 12:00 |
02:33:51.53 |
+01:33:18.8 |
HIP 11853 |
14.62 |
| 2026-02-21 00:00 |
02:34:17.70 |
+01:36:21.4 |
HIP 11853 |
19.93 |
| 2026-02-21 12:00 |
02:34:44.00 |
+01:39:23.9 |
HIP 11999 |
18.10 |
| 2026-02-22 00:00 |
02:35:10.40 |
+01:42:26.4 |
HIP 11999 |
16.78 |
| 2026-02-22 12:00 |
02:35:36.92 |
+01:45:28.8 |
HIP 11999 |
18.50 |
| 2026-02-23 00:00 |
02:36:03.56 |
+01:48:31.1 |
HIP 11999 |
22.59 |
| 2026-02-23 12:00 |
02:36:30.30 |
+01:51:33.3 |
HIP 11999 |
28.05 |
| 2026-02-24 00:00 |
02:36:57.15 |
+01:54:35.4 |
HIP 12205 |
30.50 |