メタデータ
| 項目 |
値 |
| Designation |
P/2014 W4 (PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2015-12-29T12:04:50.476800Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:02Z |
| Obs used |
91 |
| NEO |
- |
| M1 |
7.200 |
| K1 |
15.500 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2015-09-14.0000000 |
| e |
0.35307752 |
| q (au) |
4.261090 |
| a (au) |
6.586710 |
| i (deg) |
15.274347 |
| Ω (om, deg) |
33.352591 |
| ω (w, deg) |
67.411788 |
| M (ma, deg) |
353.790386 |
等級
散乱 + 全体線形
$$
M_a = (6.548 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
6.548 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.500 |
| 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) |
| 2026-03-26 00:00 |
20:52:21.25 |
-32:37:09.9 |
HIP 103173 |
27.08 |
| 2026-03-26 12:00 |
20:52:34.22 |
-32:37:04.2 |
HIP 103173 |
24.83 |
| 2026-03-27 00:00 |
20:52:47.11 |
-32:36:59.0 |
HIP 103173 |
22.70 |
| 2026-03-27 12:00 |
20:52:59.91 |
-32:36:54.3 |
HIP 103173 |
20.71 |
| 2026-03-28 00:00 |
20:53:12.63 |
-32:36:50.2 |
HIP 103173 |
18.89 |
| 2026-03-28 12:00 |
20:53:25.26 |
-32:36:46.5 |
HIP 103173 |
17.31 |
| 2026-03-29 00:00 |
20:53:37.80 |
-32:36:43.4 |
HIP 103173 |
16.01 |
| 2026-03-29 12:00 |
20:53:50.25 |
-32:36:40.9 |
HIP 103173 |
15.07 |
| 2026-03-30 00:00 |
20:54:02.62 |
-32:36:38.8 |
HIP 103173 |
14.53 |
| 2026-03-30 12:00 |
20:54:14.90 |
-32:36:37.3 |
HIP 103173 |
14.45 |
| 2026-03-31 00:00 |
20:54:27.09 |
-32:36:36.3 |
HIP 103173 |
14.80 |
| 2026-03-31 12:00 |
20:54:39.19 |
-32:36:35.9 |
HIP 103173 |
15.56 |
| 2026-04-01 00:00 |
20:54:51.20 |
-32:36:36.0 |
HIP 103173 |
16.66 |
| 2026-04-01 12:00 |
20:55:03.12 |
-32:36:36.6 |
HIP 103173 |
18.03 |
| 2026-04-02 00:00 |
20:55:14.95 |
-32:36:37.8 |
HIP 103173 |
19.61 |
| 2026-04-02 12:00 |
20:55:26.69 |
-32:36:39.5 |
HIP 103173 |
21.34 |
| 2026-04-03 00:00 |
20:55:38.34 |
-32:36:41.8 |
HIP 103350 |
22.31 |
| 2026-04-03 12:00 |
20:55:49.89 |
-32:36:44.6 |
HIP 103350 |
21.51 |
| 2026-04-04 00:00 |
20:56:01.35 |
-32:36:47.9 |
HIP 103350 |
20.97 |
| 2026-04-04 12:00 |
20:56:12.71 |
-32:36:51.8 |
HIP 103350 |
20.72 |
| 2026-04-05 00:00 |
20:56:23.99 |
-32:36:56.3 |
HIP 103465 |
19.98 |
| 2026-04-05 12:00 |
20:56:35.16 |
-32:37:01.3 |
HIP 103465 |
18.02 |
| 2026-04-06 00:00 |
20:56:46.24 |
-32:37:06.8 |
HIP 103465 |
16.17 |
| 2026-04-06 12:00 |
20:56:57.23 |
-32:37:12.9 |
HIP 103465 |
14.47 |
| 2026-04-07 00:00 |
20:57:08.11 |
-32:37:19.6 |
HIP 103465 |
12.96 |
| 2026-04-07 12:00 |
20:57:18.91 |
-32:37:26.8 |
HIP 103465 |
11.71 |
| 2026-04-08 00:00 |
20:57:29.60 |
-32:37:34.6 |
HIP 103465 |
10.79 |
| 2026-04-08 12:00 |
20:57:40.19 |
-32:37:42.9 |
HIP 103465 |
10.29 |
| 2026-04-09 00:00 |
20:57:50.69 |
-32:37:51.9 |
HIP 103465 |
10.25 |
| 2026-04-09 12:00 |
20:58:01.08 |
-32:38:01.3 |
HIP 103465 |
10.66 |
| 2026-04-10 00:00 |
20:58:11.38 |
-32:38:11.3 |
HIP 103465 |
11.46 |
| 2026-04-10 12:00 |
20:58:21.57 |
-32:38:21.9 |
HIP 103465 |
12.57 |
| 2026-04-11 00:00 |
20:58:31.66 |
-32:38:33.1 |
HIP 103465 |
13.90 |
| 2026-04-11 12:00 |
20:58:41.66 |
-32:38:44.8 |
HIP 103465 |
15.39 |
| 2026-04-12 00:00 |
20:58:51.54 |
-32:38:57.1 |
HIP 103465 |
16.99 |
| 2026-04-12 12:00 |
20:59:01.33 |
-32:39:10.0 |
HIP 103465 |
18.66 |
| 2026-04-13 00:00 |
20:59:11.01 |
-32:39:23.5 |
HIP 103465 |
20.39 |
| 2026-04-13 12:00 |
20:59:20.58 |
-32:39:37.5 |
HIP 103465 |
22.14 |
| 2026-04-14 00:00 |
20:59:30.05 |
-32:39:52.1 |
HIP 103465 |
23.91 |
| 2026-04-14 12:00 |
20:59:39.42 |
-32:40:07.3 |
HIP 103711 |
24.91 |
| 2026-04-15 00:00 |
20:59:48.68 |
-32:40:23.0 |
HIP 103711 |
23.93 |
| 2026-04-15 12:00 |
20:59:57.83 |
-32:40:39.3 |
HIP 103748 |
22.67 |
| 2026-04-16 00:00 |
21:00:06.87 |
-32:40:56.2 |
HIP 103748 |
20.97 |