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) |
| 2026-09-20 00:00 |
17:59:59.28 |
-22:29:40.6 |
HIP 88126 |
3.25 |
| 2026-09-20 12:00 |
18:00:04.08 |
-22:29:40.0 |
HIP 88126 |
3.32 |
| 2026-09-21 00:00 |
18:00:09.05 |
-22:29:39.5 |
HIP 88126 |
3.76 |
| 2026-09-21 12:00 |
18:00:14.18 |
-22:29:38.9 |
HIP 88126 |
4.49 |
| 2026-09-22 00:00 |
18:00:19.48 |
-22:29:38.4 |
HIP 88126 |
5.41 |
| 2026-09-22 12:00 |
18:00:24.94 |
-22:29:37.8 |
HIP 88126 |
6.46 |
| 2026-09-23 00:00 |
18:00:30.57 |
-22:29:37.2 |
HIP 88126 |
7.62 |
| 2026-09-23 12:00 |
18:00:36.36 |
-22:29:36.6 |
HIP 88126 |
8.84 |
| 2026-09-24 00:00 |
18:00:42.31 |
-22:29:36.0 |
HIP 88126 |
10.14 |
| 2026-09-24 12:00 |
18:00:48.43 |
-22:29:35.3 |
HIP 88126 |
11.48 |
| 2026-09-25 00:00 |
18:00:54.71 |
-22:29:34.7 |
HIP 88126 |
12.88 |
| 2026-09-25 12:00 |
18:01:01.15 |
-22:29:34.0 |
HIP 88126 |
14.33 |
| 2026-09-26 00:00 |
18:01:07.75 |
-22:29:33.3 |
HIP 88126 |
15.82 |
| 2026-09-26 12:00 |
18:01:14.51 |
-22:29:32.6 |
HIP 88126 |
17.35 |
| 2026-09-27 00:00 |
18:01:21.43 |
-22:29:31.9 |
HIP 88298 |
18.88 |
| 2026-09-27 12:00 |
18:01:28.51 |
-22:29:31.1 |
HIP 88298 |
18.30 |
| 2026-09-28 00:00 |
18:01:35.75 |
-22:29:30.4 |
HIP 88298 |
17.84 |
| 2026-09-28 12:00 |
18:01:43.14 |
-22:29:29.5 |
HIP 88298 |
17.52 |
| 2026-09-29 00:00 |
18:01:50.70 |
-22:29:28.7 |
HIP 88298 |
17.36 |
| 2026-09-29 12:00 |
18:01:58.41 |
-22:29:27.8 |
HIP 88298 |
17.38 |
| 2026-09-30 00:00 |
18:02:06.28 |
-22:29:26.9 |
HIP 88298 |
17.58 |
| 2026-09-30 12:00 |
18:02:14.31 |
-22:29:26.0 |
HIP 88396 |
17.51 |
| 2026-10-01 00:00 |
18:02:22.49 |
-22:29:25.0 |
HIP 88396 |
16.41 |
| 2026-10-01 12:00 |
18:02:30.83 |
-22:29:24.0 |
HIP 88396 |
15.45 |
| 2026-10-02 00:00 |
18:02:39.33 |
-22:29:23.0 |
HIP 88396 |
14.67 |
| 2026-10-02 12:00 |
18:02:47.98 |
-22:29:21.9 |
HIP 88396 |
14.11 |
| 2026-10-03 00:00 |
18:02:56.78 |
-22:29:20.7 |
HIP 88396 |
13.81 |
| 2026-10-03 12:00 |
18:03:05.74 |
-22:29:19.6 |
HIP 88396 |
13.81 |
| 2026-10-04 00:00 |
18:03:14.85 |
-22:29:18.3 |
HIP 88484 |
12.04 |
| 2026-10-04 12:00 |
18:03:24.12 |
-22:29:17.1 |
HIP 88484 |
10.11 |
| 2026-10-05 00:00 |
18:03:33.53 |
-22:29:15.7 |
HIP 88484 |
8.25 |
| 2026-10-05 12:00 |
18:03:43.10 |
-22:29:14.3 |
HIP 88484 |
6.57 |
| 2026-10-06 00:00 |
18:03:52.82 |
-22:29:12.9 |
HIP 88484 |
5.28 |
| 2026-10-06 12:00 |
18:04:02.69 |
-22:29:11.4 |
HIP 88484 |
4.77 |
| 2026-10-07 00:00 |
18:04:12.72 |
-22:29:09.9 |
HIP 88508 |
3.91 |
| 2026-10-07 12:00 |
18:04:22.89 |
-22:29:08.3 |
HIP 88508 |
2.84 |
| 2026-10-08 00:00 |
18:04:33.21 |
-22:29:06.6 |
HIP 88508 |
3.47 |
| 2026-10-08 12:00 |
18:04:43.68 |
-22:29:04.8 |
HIP 88508 |
5.26 |
| 2026-10-09 00:00 |
18:04:54.30 |
-22:29:03.0 |
HIP 88508 |
7.45 |
| 2026-10-09 12:00 |
18:05:05.07 |
-22:29:01.1 |
HIP 88508 |
9.80 |
| 2026-10-10 00:00 |
18:05:15.98 |
-22:28:59.2 |
HIP 88508 |
12.23 |
| 2026-10-10 12:00 |
18:05:27.04 |
-22:28:57.2 |
HIP 88508 |
14.73 |
| 2026-10-11 00:00 |
18:05:38.25 |
-22:28:55.1 |
HIP 88721 |
15.72 |