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) |
| 2026-07-29 00:00 |
11:08:43.47 |
-54:15:22.1 |
HIP 54385 |
15.02 |
| 2026-07-29 12:00 |
11:08:49.77 |
-54:15:00.6 |
HIP 54385 |
15.35 |
| 2026-07-30 00:00 |
11:08:56.11 |
-54:14:39.7 |
HIP 54385 |
15.75 |
| 2026-07-30 12:00 |
11:09:02.49 |
-54:14:19.3 |
HIP 54385 |
16.21 |
| 2026-07-31 00:00 |
11:09:08.91 |
-54:13:59.4 |
HIP 54385 |
16.73 |
| 2026-07-31 12:00 |
11:09:15.37 |
-54:13:40.1 |
HIP 54385 |
17.30 |
| 2026-08-01 00:00 |
11:09:21.88 |
-54:13:21.3 |
HIP 54385 |
17.92 |
| 2026-08-01 12:00 |
11:09:28.42 |
-54:13:03.1 |
HIP 54385 |
18.58 |
| 2026-08-02 00:00 |
11:09:35.00 |
-54:12:45.5 |
HIP 54385 |
19.29 |
| 2026-08-02 12:00 |
11:09:41.62 |
-54:12:28.4 |
HIP 54385 |
20.02 |
| 2026-08-03 00:00 |
11:09:48.28 |
-54:12:11.9 |
HIP 54385 |
20.79 |
| 2026-08-03 12:00 |
11:09:54.97 |
-54:11:55.9 |
HIP 54385 |
21.59 |
| 2026-08-04 00:00 |
11:10:01.71 |
-54:11:40.5 |
HIP 54385 |
22.41 |
| 2026-08-04 12:00 |
11:10:08.48 |
-54:11:25.7 |
HIP 54385 |
23.26 |
| 2026-08-05 00:00 |
11:10:15.28 |
-54:11:11.4 |
HIP 54385 |
24.13 |
| 2026-08-05 12:00 |
11:10:22.13 |
-54:10:57.7 |
HIP 54659 |
24.01 |
| 2026-08-06 00:00 |
11:10:29.01 |
-54:10:44.6 |
HIP 54659 |
23.88 |
| 2026-08-06 12:00 |
11:10:35.92 |
-54:10:32.0 |
HIP 54659 |
23.79 |
| 2026-08-07 00:00 |
11:10:42.87 |
-54:10:20.0 |
HIP 54659 |
23.73 |
| 2026-08-07 12:00 |
11:10:49.86 |
-54:10:08.6 |
HIP 54659 |
23.70 |
| 2026-08-08 00:00 |
11:10:56.87 |
-54:09:57.7 |
HIP 54659 |
23.71 |
| 2026-08-08 12:00 |
11:11:03.93 |
-54:09:47.5 |
HIP 54659 |
23.75 |
| 2026-08-09 00:00 |
11:11:11.01 |
-54:09:37.8 |
HIP 54659 |
23.83 |
| 2026-08-09 12:00 |
11:11:18.13 |
-54:09:28.6 |
HIP 54659 |
23.95 |
| 2026-08-10 00:00 |
11:11:25.28 |
-54:09:20.1 |
HIP 54659 |
24.10 |
| 2026-08-10 12:00 |
11:11:32.46 |
-54:09:12.1 |
HIP 54659 |
24.28 |
| 2026-08-11 00:00 |
11:11:39.68 |
-54:09:04.7 |
HIP 54659 |
24.50 |
| 2026-08-11 12:00 |
11:11:46.92 |
-54:08:57.9 |
HIP 54659 |
24.76 |
| 2026-08-12 00:00 |
11:11:54.19 |
-54:08:51.7 |
HIP 54659 |
25.05 |
| 2026-08-12 12:00 |
11:12:01.50 |
-54:08:46.0 |
HIP 54659 |
25.37 |
| 2026-08-13 00:00 |
11:12:08.83 |
-54:08:41.0 |
HIP 54659 |
25.73 |
| 2026-08-13 12:00 |
11:12:16.19 |
-54:08:36.5 |
HIP 54659 |
26.11 |
| 2026-08-14 00:00 |
11:12:23.58 |
-54:08:32.6 |
HIP 54659 |
26.53 |
| 2026-08-14 12:00 |
11:12:31.00 |
-54:08:29.3 |
HIP 54909 |
25.83 |
| 2026-08-15 00:00 |
11:12:38.45 |
-54:08:26.5 |
HIP 54909 |
25.11 |
| 2026-08-15 12:00 |
11:12:45.92 |
-54:08:24.4 |
HIP 54909 |
24.41 |
| 2026-08-16 00:00 |
11:12:53.42 |
-54:08:22.8 |
HIP 54909 |
23.72 |
| 2026-08-16 12:00 |
11:13:00.94 |
-54:08:21.9 |
HIP 54909 |
23.06 |
| 2026-08-17 00:00 |
11:13:08.49 |
-54:08:21.5 |
HIP 54909 |
22.42 |
| 2026-08-17 12:00 |
11:13:16.06 |
-54:08:21.7 |
HIP 54909 |
21.81 |
| 2026-08-18 00:00 |
11:13:23.66 |
-54:08:22.4 |
HIP 54909 |
21.23 |
| 2026-08-18 12:00 |
11:13:31.28 |
-54:08:23.8 |
HIP 54909 |
20.68 |
| 2026-08-19 00:00 |
11:13:38.93 |
-54:08:25.7 |
HIP 54909 |
20.17 |