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
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) |
| 2026-07-29 00:00 |
18:07:19.07 |
-22:31:27.9 |
HIP 88721 |
8.42 |
| 2026-07-29 12:00 |
18:07:06.97 |
-22:31:27.1 |
HIP 88721 |
6.00 |
| 2026-07-30 00:00 |
18:06:54.98 |
-22:31:26.3 |
HIP 88721 |
4.11 |
| 2026-07-30 12:00 |
18:06:43.10 |
-22:31:25.5 |
HIP 88721 |
3.62 |
| 2026-07-31 00:00 |
18:06:31.35 |
-22:31:24.6 |
HIP 88721 |
4.91 |
| 2026-07-31 12:00 |
18:06:19.72 |
-22:31:23.7 |
HIP 88721 |
7.04 |
| 2026-08-01 00:00 |
18:06:08.22 |
-22:31:22.7 |
HIP 88721 |
9.43 |
| 2026-08-01 12:00 |
18:05:56.84 |
-22:31:21.7 |
HIP 88721 |
11.91 |
| 2026-08-02 00:00 |
18:05:45.59 |
-22:31:20.7 |
HIP 88721 |
14.41 |
| 2026-08-02 12:00 |
18:05:34.46 |
-22:31:19.6 |
HIP 88721 |
16.91 |
| 2026-08-03 00:00 |
18:05:23.46 |
-22:31:18.6 |
HIP 88508 |
14.55 |
| 2026-08-03 12:00 |
18:05:12.59 |
-22:31:17.5 |
HIP 88508 |
12.21 |
| 2026-08-04 00:00 |
18:05:01.86 |
-22:31:16.3 |
HIP 88508 |
9.99 |
| 2026-08-04 12:00 |
18:04:51.25 |
-22:31:15.2 |
HIP 88508 |
7.95 |
| 2026-08-05 00:00 |
18:04:40.78 |
-22:31:14.0 |
HIP 88508 |
6.22 |
| 2026-08-05 12:00 |
18:04:30.45 |
-22:31:12.8 |
HIP 88508 |
5.10 |
| 2026-08-06 00:00 |
18:04:20.25 |
-22:31:11.6 |
HIP 88484 |
4.86 |
| 2026-08-06 12:00 |
18:04:10.19 |
-22:31:10.3 |
HIP 88484 |
3.25 |
| 2026-08-07 00:00 |
18:04:00.28 |
-22:31:09.1 |
HIP 88484 |
2.87 |
| 2026-08-07 12:00 |
18:03:50.50 |
-22:31:07.8 |
HIP 88484 |
4.03 |
| 2026-08-08 00:00 |
18:03:40.86 |
-22:31:06.5 |
HIP 88484 |
5.84 |
| 2026-08-08 12:00 |
18:03:31.36 |
-22:31:05.2 |
HIP 88484 |
7.83 |
| 2026-08-09 00:00 |
18:03:22.01 |
-22:31:03.9 |
HIP 88484 |
9.88 |
| 2026-08-09 12:00 |
18:03:12.81 |
-22:31:02.6 |
HIP 88484 |
11.93 |
| 2026-08-10 00:00 |
18:03:03.75 |
-22:31:01.2 |
HIP 88396 |
12.10 |
| 2026-08-10 12:00 |
18:02:54.84 |
-22:30:59.9 |
HIP 88396 |
12.21 |
| 2026-08-11 00:00 |
18:02:46.08 |
-22:30:58.5 |
HIP 88396 |
12.66 |
| 2026-08-11 12:00 |
18:02:37.47 |
-22:30:57.2 |
HIP 88396 |
13.38 |
| 2026-08-12 00:00 |
18:02:29.01 |
-22:30:55.8 |
HIP 88396 |
14.33 |
| 2026-08-12 12:00 |
18:02:20.71 |
-22:30:54.4 |
HIP 88396 |
15.44 |
| 2026-08-13 00:00 |
18:02:12.56 |
-22:30:53.1 |
HIP 88298 |
16.48 |
| 2026-08-13 12:00 |
18:02:04.56 |
-22:30:51.7 |
HIP 88298 |
16.13 |
| 2026-08-14 00:00 |
18:01:56.71 |
-22:30:50.3 |
HIP 88298 |
15.99 |
| 2026-08-14 12:00 |
18:01:49.03 |
-22:30:48.9 |
HIP 88298 |
16.05 |
| 2026-08-15 00:00 |
18:01:41.50 |
-22:30:47.5 |
HIP 88298 |
16.30 |
| 2026-08-15 12:00 |
18:01:34.13 |
-22:30:46.1 |
HIP 88298 |
16.71 |
| 2026-08-16 00:00 |
18:01:26.91 |
-22:30:44.8 |
HIP 88298 |
17.28 |
| 2026-08-16 12:00 |
18:01:19.86 |
-22:30:43.4 |
HIP 88298 |
17.96 |
| 2026-08-17 00:00 |
18:01:12.97 |
-22:30:42.0 |
HIP 88126 |
16.81 |
| 2026-08-17 12:00 |
18:01:06.24 |
-22:30:40.6 |
HIP 88126 |
15.27 |
| 2026-08-18 00:00 |
18:00:59.67 |
-22:30:39.3 |
HIP 88126 |
13.77 |
| 2026-08-18 12:00 |
18:00:53.26 |
-22:30:37.9 |
HIP 88126 |
12.32 |
| 2026-08-19 00:00 |
18:00:47.01 |
-22:30:36.5 |
HIP 88126 |
10.91 |