メタデータ
| 項目 |
値 |
| Designation |
P/2014 M4 (PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2014-12-27T14:02:39.793920Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:56Z |
| Obs used |
87 |
| NEO |
- |
| M1 |
16.600 |
| K1 |
4.500 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2014-09-16.0000000 |
| e |
0.59553911 |
| q (au) |
2.351457 |
| a (au) |
5.813805 |
| i (deg) |
3.345156 |
| Ω (om, deg) |
265.062268 |
| ω (w, deg) |
145.270395 |
| M (ma, deg) |
352.787298 |
等級
散乱 + 全体線形
$$
M_a = (15.730 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
15.730 |
| n |
2.000 |
| gf |
1.000 |
| 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
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-03-26 00:00 |
18:41:42.78 |
-22:36:44.5 |
HIP 91550 |
21.40 |
| 2026-03-26 12:00 |
18:41:50.06 |
-22:36:31.1 |
HIP 91550 |
23.09 |
| 2026-03-27 00:00 |
18:41:57.20 |
-22:36:17.7 |
HIP 91826 |
22.44 |
| 2026-03-27 12:00 |
18:42:04.21 |
-22:36:04.4 |
HIP 91826 |
20.95 |
| 2026-03-28 00:00 |
18:42:11.07 |
-22:35:51.3 |
HIP 91826 |
19.52 |
| 2026-03-28 12:00 |
18:42:17.80 |
-22:35:38.2 |
HIP 91826 |
18.13 |
| 2026-03-29 00:00 |
18:42:24.39 |
-22:35:25.3 |
HIP 91826 |
16.81 |
| 2026-03-29 12:00 |
18:42:30.83 |
-22:35:12.4 |
HIP 91826 |
15.55 |
| 2026-03-30 00:00 |
18:42:37.14 |
-22:34:59.7 |
HIP 91826 |
14.36 |
| 2026-03-30 12:00 |
18:42:43.31 |
-22:34:47.1 |
HIP 91826 |
13.25 |
| 2026-03-31 00:00 |
18:42:49.33 |
-22:34:34.6 |
HIP 91826 |
12.23 |
| 2026-03-31 12:00 |
18:42:55.21 |
-22:34:22.2 |
HIP 91826 |
11.31 |
| 2026-04-01 00:00 |
18:43:00.95 |
-22:34:09.9 |
HIP 91826 |
10.51 |
| 2026-04-01 12:00 |
18:43:06.54 |
-22:33:57.8 |
HIP 91826 |
9.84 |
| 2026-04-02 00:00 |
18:43:11.99 |
-22:33:45.7 |
HIP 91826 |
9.31 |
| 2026-04-02 12:00 |
18:43:17.30 |
-22:33:33.8 |
HIP 91864 |
8.87 |
| 2026-04-03 00:00 |
18:43:22.46 |
-22:33:22.0 |
HIP 91864 |
8.30 |
| 2026-04-03 12:00 |
18:43:27.48 |
-22:33:10.3 |
HIP 91864 |
7.88 |
| 2026-04-04 00:00 |
18:43:32.35 |
-22:32:58.8 |
HIP 91864 |
7.62 |
| 2026-04-04 12:00 |
18:43:37.07 |
-22:32:47.3 |
HIP 91864 |
7.54 |
| 2026-04-05 00:00 |
18:43:41.65 |
-22:32:36.0 |
HIP 91864 |
7.62 |
| 2026-04-05 12:00 |
18:43:46.08 |
-22:32:24.8 |
HIP 91864 |
7.84 |
| 2026-04-06 00:00 |
18:43:50.36 |
-22:32:13.8 |
HIP 91864 |
8.18 |
| 2026-04-06 12:00 |
18:43:54.49 |
-22:32:02.9 |
HIP 91864 |
8.61 |
| 2026-04-07 00:00 |
18:43:58.47 |
-22:31:52.1 |
HIP 91864 |
9.10 |
| 2026-04-07 12:00 |
18:44:02.30 |
-22:31:41.5 |
HIP 91864 |
9.65 |
| 2026-04-08 00:00 |
18:44:05.98 |
-22:31:30.9 |
HIP 91864 |
10.22 |
| 2026-04-08 12:00 |
18:44:09.51 |
-22:31:20.6 |
HIP 91864 |
10.81 |
| 2026-04-09 00:00 |
18:44:12.89 |
-22:31:10.3 |
HIP 91864 |
11.41 |
| 2026-04-09 12:00 |
18:44:16.12 |
-22:31:00.2 |
HIP 91864 |
12.01 |
| 2026-04-10 00:00 |
18:44:19.20 |
-22:30:50.3 |
HIP 91864 |
12.60 |
| 2026-04-10 12:00 |
18:44:22.12 |
-22:30:40.4 |
HIP 91864 |
13.18 |
| 2026-04-11 00:00 |
18:44:24.89 |
-22:30:30.8 |
HIP 91864 |
13.74 |
| 2026-04-11 12:00 |
18:44:27.50 |
-22:30:21.2 |
HIP 91864 |
14.29 |
| 2026-04-12 00:00 |
18:44:29.96 |
-22:30:11.8 |
HIP 91864 |
14.81 |
| 2026-04-12 12:00 |
18:44:32.27 |
-22:30:02.6 |
HIP 91864 |
15.31 |
| 2026-04-13 00:00 |
18:44:34.42 |
-22:29:53.5 |
HIP 91864 |
15.78 |
| 2026-04-13 12:00 |
18:44:36.42 |
-22:29:44.6 |
HIP 91864 |
16.23 |
| 2026-04-14 00:00 |
18:44:38.26 |
-22:29:35.8 |
HIP 91864 |
16.65 |
| 2026-04-14 12:00 |
18:44:39.94 |
-22:29:27.1 |
HIP 91864 |
17.04 |
| 2026-04-15 00:00 |
18:44:41.46 |
-22:29:18.6 |
HIP 91864 |
17.40 |
| 2026-04-15 12:00 |
18:44:42.83 |
-22:29:10.3 |
HIP 91864 |
17.73 |
| 2026-04-16 00:00 |
18:44:44.04 |
-22:29:02.1 |
HIP 91864 |
18.04 |