メタデータ
| 項目 |
値 |
| Designation |
C/2017 M3 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2017-04-28T06:37:59.880000Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:35Z |
| Obs used |
65 |
| NEO |
- |
| M1 |
7.300 |
| 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) |
2017-10-29.0000000 |
| e |
0.97323499 |
| q (au) |
4.656283 |
| a (au) |
173.969005 |
| i (deg) |
77.506843 |
| Ω (om, deg) |
6.997266 |
| ω (w, deg) |
110.325474 |
| M (ma, deg) |
0.078915 |
等級
散乱 + 全体線形
$$
M_a = (6.736 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
6.736 |
| n |
6.000 |
| gf |
0.998 |
| 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) |
| 2026-06-01 00:00 |
11:03:08.55 |
-55:48:12.5 |
HIP 54118 |
10.77 |
| 2026-06-01 12:00 |
11:03:07.28 |
-55:47:06.6 |
HIP 54118 |
10.84 |
| 2026-06-02 00:00 |
11:03:06.09 |
-55:46:00.9 |
HIP 54118 |
11.01 |
| 2026-06-02 12:00 |
11:03:04.99 |
-55:44:55.3 |
HIP 54118 |
11.28 |
| 2026-06-03 00:00 |
11:03:03.97 |
-55:43:49.8 |
HIP 54118 |
11.63 |
| 2026-06-03 12:00 |
11:03:03.03 |
-55:42:44.5 |
HIP 54118 |
12.07 |
| 2026-06-04 00:00 |
11:03:02.17 |
-55:41:39.3 |
HIP 54118 |
12.57 |
| 2026-06-04 12:00 |
11:03:01.39 |
-55:40:34.3 |
HIP 54118 |
13.13 |
| 2026-06-05 00:00 |
11:03:00.70 |
-55:39:29.5 |
HIP 54118 |
13.75 |
| 2026-06-05 12:00 |
11:03:00.09 |
-55:38:24.8 |
HIP 54118 |
14.41 |
| 2026-06-06 00:00 |
11:02:59.55 |
-55:37:20.3 |
HIP 54118 |
15.10 |
| 2026-06-06 12:00 |
11:02:59.10 |
-55:36:15.9 |
HIP 54118 |
15.83 |
| 2026-06-07 00:00 |
11:02:58.73 |
-55:35:11.8 |
HIP 54118 |
16.59 |
| 2026-06-07 12:00 |
11:02:58.44 |
-55:34:07.8 |
HIP 54118 |
17.37 |
| 2026-06-08 00:00 |
11:02:58.23 |
-55:33:04.0 |
HIP 54118 |
18.17 |
| 2026-06-08 12:00 |
11:02:58.10 |
-55:32:00.4 |
HIP 54118 |
18.99 |
| 2026-06-09 00:00 |
11:02:58.05 |
-55:30:57.1 |
HIP 54118 |
19.82 |
| 2026-06-09 12:00 |
11:02:58.08 |
-55:29:53.9 |
HIP 54118 |
20.66 |
| 2026-06-10 00:00 |
11:02:58.19 |
-55:28:50.9 |
HIP 54118 |
21.51 |
| 2026-06-10 12:00 |
11:02:58.38 |
-55:27:48.2 |
HIP 54118 |
22.36 |
| 2026-06-11 00:00 |
11:02:58.65 |
-55:26:45.7 |
HIP 54118 |
23.23 |
| 2026-06-11 12:00 |
11:02:59.00 |
-55:25:43.4 |
HIP 54118 |
24.10 |
| 2026-06-12 00:00 |
11:02:59.42 |
-55:24:41.4 |
HIP 54118 |
24.97 |
| 2026-06-12 12:00 |
11:02:59.93 |
-55:23:39.6 |
HIP 54118 |
25.84 |
| 2026-06-13 00:00 |
11:03:00.51 |
-55:22:38.0 |
HIP 54118 |
26.72 |
| 2026-06-13 12:00 |
11:03:01.18 |
-55:21:36.7 |
HIP 54118 |
27.60 |
| 2026-06-14 00:00 |
11:03:01.92 |
-55:20:35.7 |
HIP 54271 |
27.62 |
| 2026-06-14 12:00 |
11:03:02.73 |
-55:19:34.9 |
HIP 54271 |
27.25 |
| 2026-06-15 00:00 |
11:03:03.63 |
-55:18:34.4 |
HIP 54271 |
26.90 |
| 2026-06-15 12:00 |
11:03:04.60 |
-55:17:34.2 |
HIP 54271 |
26.57 |
| 2026-06-16 00:00 |
11:03:05.65 |
-55:16:34.3 |
HIP 54271 |
26.27 |
| 2026-06-16 12:00 |
11:03:06.78 |
-55:15:34.6 |
HIP 54271 |
26.00 |
| 2026-06-17 00:00 |
11:03:07.98 |
-55:14:35.2 |
HIP 54271 |
25.75 |
| 2026-06-17 12:00 |
11:03:09.26 |
-55:13:36.2 |
HIP 54271 |
25.53 |
| 2026-06-18 00:00 |
11:03:10.61 |
-55:12:37.4 |
HIP 54271 |
25.33 |
| 2026-06-18 12:00 |
11:03:12.04 |
-55:11:38.9 |
HIP 54271 |
25.16 |
| 2026-06-19 00:00 |
11:03:13.55 |
-55:10:40.8 |
HIP 54271 |
25.02 |
| 2026-06-19 12:00 |
11:03:15.13 |
-55:09:42.9 |
HIP 54271 |
24.91 |
| 2026-06-20 00:00 |
11:03:16.78 |
-55:08:45.4 |
HIP 54271 |
24.82 |
| 2026-06-20 12:00 |
11:03:18.51 |
-55:07:48.2 |
HIP 54271 |
24.76 |
| 2026-06-21 00:00 |
11:03:20.31 |
-55:06:51.4 |
HIP 54271 |
24.73 |
| 2026-06-21 12:00 |
11:03:22.18 |
-55:05:54.8 |
HIP 54271 |
24.72 |
| 2026-06-22 00:00 |
11:03:24.12 |
-55:04:58.6 |
HIP 54271 |
24.74 |