メタデータ
| 項目 |
値 |
| Designation |
P/2013 W1 (PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2014-03-08T04:13:11.366400Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:42Z |
| Obs used |
105 |
| NEO |
- |
| M1 |
18.800 |
| K1 |
5.750 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2013-12-22.0000000 |
| e |
0.59388126 |
| q (au) |
1.415613 |
| a (au) |
3.485712 |
| i (deg) |
4.699497 |
| Ω (om, deg) |
117.856010 |
| ω (w, deg) |
1.327118 |
| M (ma, deg) |
348.463235 |
等級
散乱 + 全体線形
$$
M_a = (17.227 + 3.690\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
17.227 |
| n |
3.690 |
| gf |
0.800 |
| gb |
-1.000 |
| 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
ファインディングチャート
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-03-26 00:00 |
23:52:54.10 |
-04:05:11.1 |
HIP 117644 |
40.20 |
| 2026-03-26 12:00 |
23:53:30.23 |
-04:01:25.7 |
HIP 117644 |
42.63 |
| 2026-03-27 00:00 |
23:54:06.39 |
-03:57:40.1 |
HIP 117926 |
45.09 |
| 2026-03-27 12:00 |
23:54:42.58 |
-03:53:54.5 |
HIP 117926 |
46.60 |
| 2026-03-28 00:00 |
23:55:18.80 |
-03:50:08.7 |
HIP 118166 |
43.36 |
| 2026-03-28 12:00 |
23:55:55.05 |
-03:46:22.9 |
HIP 118166 |
35.67 |
| 2026-03-29 00:00 |
23:56:31.32 |
-03:42:36.9 |
HIP 118166 |
29.26 |
| 2026-03-29 12:00 |
23:57:07.63 |
-03:38:50.8 |
HIP 118209 |
23.79 |
| 2026-03-30 00:00 |
23:57:43.96 |
-03:35:04.7 |
HIP 118209 |
14.19 |
| 2026-03-30 12:00 |
23:58:20.32 |
-03:31:18.5 |
HIP 118209 |
5.41 |
| 2026-03-31 00:00 |
23:58:56.71 |
-03:27:32.1 |
HIP 118209 |
7.09 |
| 2026-03-31 12:00 |
23:59:33.12 |
-03:23:45.7 |
HIP 44 |
15.61 |
| 2026-04-01 00:00 |
00:00:09.57 |
-03:19:59.2 |
HIP 44 |
5.79 |
| 2026-04-01 12:00 |
00:00:46.03 |
-03:16:12.7 |
HIP 44 |
4.15 |
| 2026-04-02 00:00 |
00:01:22.53 |
-03:12:26.0 |
HIP 145 |
12.71 |
| 2026-04-02 12:00 |
00:01:59.05 |
-03:08:39.3 |
HIP 145 |
7.41 |
| 2026-04-03 00:00 |
00:02:35.60 |
-03:04:52.6 |
HIP 145 |
11.97 |
| 2026-04-03 12:00 |
00:03:12.18 |
-03:01:05.7 |
HIP 168 |
19.95 |
| 2026-04-04 00:00 |
00:03:48.78 |
-02:57:18.8 |
HIP 168 |
26.43 |
| 2026-04-04 12:00 |
00:04:25.41 |
-02:53:31.9 |
HIP 168 |
34.57 |
| 2026-04-05 00:00 |
00:05:02.07 |
-02:49:44.9 |
HIP 168 |
43.46 |
| 2026-04-05 12:00 |
00:05:38.75 |
-02:45:57.8 |
HIP 635 |
33.91 |
| 2026-04-06 00:00 |
00:06:15.46 |
-02:42:10.7 |
HIP 635 |
23.99 |
| 2026-04-06 12:00 |
00:06:52.19 |
-02:38:23.6 |
HIP 635 |
14.07 |
| 2026-04-07 00:00 |
00:07:28.95 |
-02:34:36.4 |
HIP 635 |
4.14 |
| 2026-04-07 12:00 |
00:08:05.73 |
-02:30:49.2 |
HIP 664 |
4.27 |
| 2026-04-08 00:00 |
00:08:42.54 |
-02:27:02.0 |
HIP 664 |
7.61 |
| 2026-04-08 12:00 |
00:09:19.37 |
-02:23:14.8 |
HIP 700 |
13.42 |
| 2026-04-09 00:00 |
00:09:56.22 |
-02:19:27.5 |
HIP 803 |
14.22 |
| 2026-04-09 12:00 |
00:10:33.10 |
-02:15:40.2 |
HIP 892 |
12.68 |
| 2026-04-10 00:00 |
00:11:10.01 |
-02:11:52.9 |
HIP 892 |
8.10 |
| 2026-04-10 12:00 |
00:11:46.93 |
-02:08:05.6 |
HIP 892 |
13.01 |
| 2026-04-11 00:00 |
00:12:23.89 |
-02:04:18.3 |
HIP 892 |
21.73 |
| 2026-04-11 12:00 |
00:13:00.86 |
-02:00:31.0 |
HIP 1153 |
23.78 |
| 2026-04-12 00:00 |
00:13:37.86 |
-01:56:43.7 |
HIP 1153 |
19.11 |
| 2026-04-12 12:00 |
00:14:14.88 |
-01:52:56.4 |
HIP 1153 |
19.09 |
| 2026-04-13 00:00 |
00:14:51.92 |
-01:49:09.2 |
HIP 1153 |
23.73 |
| 2026-04-13 12:00 |
00:15:28.98 |
-01:45:22.0 |
HIP 1321 |
21.66 |
| 2026-04-14 00:00 |
00:16:06.07 |
-01:41:34.8 |
HIP 1321 |
12.52 |
| 2026-04-14 12:00 |
00:16:43.17 |
-01:37:47.6 |
HIP 1365 |
5.76 |
| 2026-04-15 00:00 |
00:17:20.30 |
-01:34:00.4 |
HIP 1365 |
6.36 |
| 2026-04-15 12:00 |
00:17:57.45 |
-01:30:13.4 |
HIP 1365 |
15.77 |
| 2026-04-16 00:00 |
00:18:34.61 |
-01:26:26.3 |
HIP 1365 |
25.65 |