メタデータ
| 項目 |
値 |
| Designation |
C/2014 W9 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2015-02-15T16:56:21.163200Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:03Z |
| Obs used |
120 |
| NEO |
- |
| M1 |
14.600 |
| K1 |
13.750 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2015-01-29.0000000 |
| e |
0.85784434 |
| q (au) |
1.587455 |
| a (au) |
11.167021 |
| i (deg) |
10.630531 |
| Ω (om, deg) |
21.288616 |
| ω (w, deg) |
167.769440 |
| M (ma, deg) |
359.532358 |
等級
散乱 + 全体線形
$$
M_a = (14.130 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
14.130 |
| n |
6.000 |
| gf |
0.800 |
| gb |
-0.833 |
| k |
0.986 |
| δ90 |
1.000 |
| 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) |
| 2026-07-29 00:00 |
00:10:22.71 |
-03:35:34.3 |
HIP 788 |
11.00 |
| 2026-07-29 12:00 |
00:10:19.92 |
-03:35:57.2 |
HIP 788 |
10.21 |
| 2026-07-30 00:00 |
00:10:17.09 |
-03:36:20.3 |
HIP 788 |
9.41 |
| 2026-07-30 12:00 |
00:10:14.22 |
-03:36:43.7 |
HIP 788 |
8.59 |
| 2026-07-31 00:00 |
00:10:11.30 |
-03:37:07.3 |
HIP 788 |
7.76 |
| 2026-07-31 12:00 |
00:10:08.34 |
-03:37:31.2 |
HIP 788 |
6.92 |
| 2026-08-01 00:00 |
00:10:05.34 |
-03:37:55.3 |
HIP 788 |
6.07 |
| 2026-08-01 12:00 |
00:10:02.29 |
-03:38:19.7 |
HIP 788 |
5.21 |
| 2026-08-02 00:00 |
00:09:59.20 |
-03:38:44.3 |
HIP 788 |
4.34 |
| 2026-08-02 12:00 |
00:09:56.07 |
-03:39:09.1 |
HIP 788 |
3.46 |
| 2026-08-03 00:00 |
00:09:52.90 |
-03:39:34.2 |
HIP 788 |
2.56 |
| 2026-08-03 12:00 |
00:09:49.68 |
-03:39:59.5 |
HIP 788 |
1.66 |
| 2026-08-04 00:00 |
00:09:46.43 |
-03:40:25.0 |
HIP 788 |
0.74 |
| 2026-08-04 12:00 |
00:09:43.13 |
-03:40:50.7 |
HIP 788 |
0.20 |
| 2026-08-05 00:00 |
00:09:39.79 |
-03:41:16.7 |
HIP 788 |
1.13 |
| 2026-08-05 12:00 |
00:09:36.41 |
-03:41:42.9 |
HIP 788 |
2.08 |
| 2026-08-06 00:00 |
00:09:32.98 |
-03:42:09.4 |
HIP 788 |
3.04 |
| 2026-08-06 12:00 |
00:09:29.52 |
-03:42:36.0 |
HIP 788 |
4.01 |
| 2026-08-07 00:00 |
00:09:26.02 |
-03:43:02.9 |
HIP 788 |
4.99 |
| 2026-08-07 12:00 |
00:09:22.47 |
-03:43:30.0 |
HIP 788 |
5.99 |
| 2026-08-08 00:00 |
00:09:18.89 |
-03:43:57.3 |
HIP 788 |
6.99 |
| 2026-08-08 12:00 |
00:09:15.26 |
-03:44:24.8 |
HIP 788 |
8.00 |
| 2026-08-09 00:00 |
00:09:11.60 |
-03:44:52.5 |
HIP 788 |
9.03 |
| 2026-08-09 12:00 |
00:09:07.90 |
-03:45:20.4 |
HIP 788 |
10.06 |
| 2026-08-10 00:00 |
00:09:04.16 |
-03:45:48.6 |
HIP 788 |
11.11 |
| 2026-08-10 12:00 |
00:09:00.37 |
-03:46:16.9 |
HIP 788 |
12.16 |
| 2026-08-11 00:00 |
00:08:56.56 |
-03:46:45.5 |
HIP 788 |
13.23 |
| 2026-08-11 12:00 |
00:08:52.70 |
-03:47:14.2 |
HIP 788 |
14.30 |
| 2026-08-12 00:00 |
00:08:48.80 |
-03:47:43.1 |
HIP 788 |
15.39 |
| 2026-08-12 12:00 |
00:08:44.87 |
-03:48:12.3 |
HIP 788 |
16.48 |
| 2026-08-13 00:00 |
00:08:40.90 |
-03:48:41.6 |
HIP 788 |
17.58 |
| 2026-08-13 12:00 |
00:08:36.90 |
-03:49:11.1 |
HIP 788 |
18.70 |
| 2026-08-14 00:00 |
00:08:32.86 |
-03:49:40.8 |
HIP 788 |
19.82 |
| 2026-08-14 12:00 |
00:08:28.78 |
-03:50:10.6 |
HIP 788 |
20.95 |
| 2026-08-15 00:00 |
00:08:24.66 |
-03:50:40.7 |
HIP 788 |
22.09 |
| 2026-08-15 12:00 |
00:08:20.51 |
-03:51:10.9 |
HIP 788 |
23.25 |
| 2026-08-16 00:00 |
00:08:16.33 |
-03:51:41.3 |
HIP 788 |
24.41 |
| 2026-08-16 12:00 |
00:08:12.11 |
-03:52:11.8 |
HIP 569 |
24.39 |
| 2026-08-17 00:00 |
00:08:07.86 |
-03:52:42.5 |
HIP 569 |
23.87 |
| 2026-08-17 12:00 |
00:08:03.57 |
-03:53:13.4 |
HIP 569 |
23.40 |
| 2026-08-18 00:00 |
00:07:59.25 |
-03:53:44.5 |
HIP 569 |
22.97 |
| 2026-08-18 12:00 |
00:07:54.90 |
-03:54:15.7 |
HIP 569 |
22.60 |
| 2026-08-19 00:00 |
00:07:50.51 |
-03:54:47.0 |
HIP 569 |
22.28 |