P/2015 M2 (PANSTARRS)
メタデータ
| 項目 |
値 |
| Designation |
P/2015 M2 (PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2015-08-31T03:13:30.483840Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:13Z |
| Obs used |
152 |
| NEO |
- |
| M1 |
7.000 |
| K1 |
11.750 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2016-01-31.0000000 |
| e |
0.17907655 |
| q (au) |
5.912783 |
| a (au) |
7.202599 |
| i (deg) |
3.973865 |
| Ω (om, deg) |
86.611339 |
| ω (w, deg) |
224.786932 |
| M (ma, deg) |
7.794352 |
等級
散乱 + 全体線形
$$
M_a = (8.209 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
8.209 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.779 |
| k |
0.800 |
| 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 |
09:42:02.78 |
+17:39:08.4 |
HIP 47667 |
17.74 |
| 2026-02-03 12:00 |
09:41:52.14 |
+17:40:06.7 |
HIP 47504 |
19.56 |
| 2026-02-04 00:00 |
09:41:41.47 |
+17:41:04.9 |
HIP 47504 |
17.40 |
| 2026-02-04 12:00 |
09:41:30.78 |
+17:42:03.0 |
HIP 47504 |
15.41 |
| 2026-02-05 00:00 |
09:41:20.07 |
+17:43:01.1 |
HIP 47504 |
13.69 |
| 2026-02-05 12:00 |
09:41:09.33 |
+17:43:59.1 |
HIP 47504 |
12.33 |
| 2026-02-06 00:00 |
09:40:58.57 |
+17:44:57.0 |
HIP 47504 |
11.47 |
| 2026-02-06 12:00 |
09:40:47.79 |
+17:45:54.8 |
HIP 47504 |
11.24 |
| 2026-02-07 00:00 |
09:40:37.00 |
+17:46:52.6 |
HIP 47504 |
11.66 |
| 2026-02-07 12:00 |
09:40:26.18 |
+17:47:50.2 |
HIP 47504 |
12.69 |
| 2026-02-08 00:00 |
09:40:15.36 |
+17:48:47.7 |
HIP 47504 |
14.18 |
| 2026-02-08 12:00 |
09:40:04.52 |
+17:49:45.1 |
HIP 47504 |
16.01 |
| 2026-02-09 00:00 |
09:39:53.66 |
+17:50:42.4 |
HIP 47504 |
18.08 |
| 2026-02-09 12:00 |
09:39:42.80 |
+17:51:39.5 |
HIP 47504 |
20.32 |
| 2026-02-10 00:00 |
09:39:31.93 |
+17:52:36.5 |
HIP 47504 |
22.67 |
| 2026-02-10 12:00 |
09:39:21.05 |
+17:53:33.4 |
HIP 47504 |
25.11 |
| 2026-02-11 00:00 |
09:39:10.16 |
+17:54:30.1 |
HIP 47375 |
26.42 |
| 2026-02-11 12:00 |
09:38:59.28 |
+17:55:26.6 |
HIP 47375 |
27.45 |
| 2026-02-12 00:00 |
09:38:48.38 |
+17:56:23.0 |
HIP 47375 |
28.70 |
| 2026-02-12 12:00 |
09:38:37.49 |
+17:57:19.1 |
HIP 47375 |
30.15 |
| 2026-02-13 00:00 |
09:38:26.60 |
+17:58:15.1 |
HIP 47375 |
31.76 |
| 2026-02-13 12:00 |
09:38:15.71 |
+17:59:10.9 |
HIP 47375 |
33.53 |
| 2026-02-14 00:00 |
09:38:04.83 |
+18:00:06.4 |
HIP 47375 |
35.42 |
| 2026-02-14 12:00 |
09:37:53.95 |
+18:01:01.8 |
HIP 47375 |
37.41 |
| 2026-02-15 00:00 |
09:37:43.07 |
+18:01:56.9 |
HIP 47278 |
36.98 |
| 2026-02-15 12:00 |
09:37:32.21 |
+18:02:51.8 |
HIP 47278 |
36.56 |
| 2026-02-16 00:00 |
09:37:21.36 |
+18:03:46.5 |
HIP 47278 |
36.35 |
| 2026-02-16 12:00 |
09:37:10.51 |
+18:04:40.9 |
HIP 47278 |
36.35 |
| 2026-02-17 00:00 |
09:36:59.69 |
+18:05:35.1 |
HIP 46986 |
35.09 |
| 2026-02-17 12:00 |
09:36:48.87 |
+18:06:29.0 |
HIP 46986 |
32.80 |
| 2026-02-18 00:00 |
09:36:38.08 |
+18:07:22.6 |
HIP 46986 |
30.59 |
| 2026-02-18 12:00 |
09:36:27.30 |
+18:08:16.0 |
HIP 46986 |
28.46 |
| 2026-02-19 00:00 |
09:36:16.54 |
+18:09:09.1 |
HIP 46986 |
26.44 |
| 2026-02-19 12:00 |
09:36:05.80 |
+18:10:01.9 |
HIP 46986 |
24.56 |
| 2026-02-20 00:00 |
09:35:55.09 |
+18:10:54.4 |
HIP 46986 |
22.85 |
| 2026-02-20 12:00 |
09:35:44.40 |
+18:11:46.6 |
HIP 46986 |
21.34 |
| 2026-02-21 00:00 |
09:35:33.74 |
+18:12:38.4 |
HIP 46986 |
20.08 |
| 2026-02-21 12:00 |
09:35:23.11 |
+18:13:30.0 |
HIP 46986 |
19.11 |
| 2026-02-22 00:00 |
09:35:12.51 |
+18:14:21.2 |
HIP 46986 |
18.48 |
| 2026-02-22 12:00 |
09:35:01.93 |
+18:15:12.1 |
HIP 46986 |
18.22 |
| 2026-02-23 00:00 |
09:34:51.39 |
+18:16:02.7 |
HIP 46986 |
18.34 |
| 2026-02-23 12:00 |
09:34:40.89 |
+18:16:52.9 |
HIP 46900 |
17.57 |
| 2026-02-24 00:00 |
09:34:30.42 |
+18:17:42.8 |
HIP 46900 |
15.09 |