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 |
1.000 |
| gb |
-0.501 |
| 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 |
11:17:48.05 |
-57:51:18.8 |
HIP 55205 |
19.81 |
| 2026-03-26 12:00 |
11:17:37.41 |
-57:50:52.9 |
HIP 54991 |
20.08 |
| 2026-03-27 00:00 |
11:17:26.80 |
-57:50:26.2 |
HIP 54991 |
18.69 |
| 2026-03-27 12:00 |
11:17:16.23 |
-57:49:58.9 |
HIP 54991 |
17.30 |
| 2026-03-28 00:00 |
11:17:05.69 |
-57:49:30.9 |
HIP 54991 |
15.92 |
| 2026-03-28 12:00 |
11:16:55.18 |
-57:49:02.3 |
HIP 54991 |
14.56 |
| 2026-03-29 00:00 |
11:16:44.71 |
-57:48:32.9 |
HIP 54991 |
13.23 |
| 2026-03-29 12:00 |
11:16:34.27 |
-57:48:03.0 |
HIP 54991 |
11.92 |
| 2026-03-30 00:00 |
11:16:23.87 |
-57:47:32.4 |
HIP 54991 |
10.64 |
| 2026-03-30 12:00 |
11:16:13.51 |
-57:47:01.1 |
HIP 54991 |
9.43 |
| 2026-03-31 00:00 |
11:16:03.19 |
-57:46:29.2 |
HIP 54991 |
8.29 |
| 2026-03-31 12:00 |
11:15:52.91 |
-57:45:56.7 |
HIP 54991 |
7.26 |
| 2026-04-01 00:00 |
11:15:42.67 |
-57:45:23.5 |
HIP 54991 |
6.41 |
| 2026-04-01 12:00 |
11:15:32.47 |
-57:44:49.8 |
HIP 54991 |
5.79 |
| 2026-04-02 00:00 |
11:15:22.31 |
-57:44:15.3 |
HIP 54991 |
5.50 |
| 2026-04-02 12:00 |
11:15:12.20 |
-57:43:40.3 |
HIP 54991 |
5.59 |
| 2026-04-03 00:00 |
11:15:02.13 |
-57:43:04.7 |
HIP 54991 |
6.03 |
| 2026-04-03 12:00 |
11:14:52.10 |
-57:42:28.4 |
HIP 54896 |
6.70 |
| 2026-04-04 00:00 |
11:14:42.12 |
-57:41:51.6 |
HIP 54896 |
6.64 |
| 2026-04-04 12:00 |
11:14:32.19 |
-57:41:14.1 |
HIP 54896 |
6.91 |
| 2026-04-05 00:00 |
11:14:22.30 |
-57:40:36.1 |
HIP 54896 |
7.48 |
| 2026-04-05 12:00 |
11:14:12.46 |
-57:39:57.4 |
HIP 54896 |
8.27 |
| 2026-04-06 00:00 |
11:14:02.67 |
-57:39:18.2 |
HIP 54896 |
9.24 |
| 2026-04-06 12:00 |
11:13:52.93 |
-57:38:38.4 |
HIP 54896 |
10.33 |
| 2026-04-07 00:00 |
11:13:43.23 |
-57:37:58.0 |
HIP 54896 |
11.51 |
| 2026-04-07 12:00 |
11:13:33.59 |
-57:37:17.0 |
HIP 54896 |
12.75 |
| 2026-04-08 00:00 |
11:13:24.01 |
-57:36:35.5 |
HIP 54896 |
14.04 |
| 2026-04-08 12:00 |
11:13:14.47 |
-57:35:53.4 |
HIP 54896 |
15.36 |
| 2026-04-09 00:00 |
11:13:04.99 |
-57:35:10.7 |
HIP 54896 |
16.71 |
| 2026-04-09 12:00 |
11:12:55.56 |
-57:34:27.5 |
HIP 54896 |
18.07 |
| 2026-04-10 00:00 |
11:12:46.18 |
-57:33:43.7 |
HIP 54834 |
18.19 |
| 2026-04-10 12:00 |
11:12:36.86 |
-57:32:59.4 |
HIP 54834 |
18.00 |
| 2026-04-11 00:00 |
11:12:27.60 |
-57:32:14.6 |
HIP 54834 |
17.91 |
| 2026-04-11 12:00 |
11:12:18.40 |
-57:31:29.2 |
HIP 54834 |
17.93 |
| 2026-04-12 00:00 |
11:12:09.25 |
-57:30:43.3 |
HIP 54834 |
18.06 |
| 2026-04-12 12:00 |
11:12:00.16 |
-57:29:56.9 |
HIP 54834 |
18.28 |
| 2026-04-13 00:00 |
11:11:51.13 |
-57:29:10.0 |
HIP 54834 |
18.61 |
| 2026-04-13 12:00 |
11:11:42.16 |
-57:28:22.6 |
HIP 54834 |
19.03 |
| 2026-04-14 00:00 |
11:11:33.25 |
-57:27:34.6 |
HIP 54834 |
19.54 |
| 2026-04-14 12:00 |
11:11:24.40 |
-57:26:46.2 |
HIP 54499 |
19.59 |
| 2026-04-15 00:00 |
11:11:15.62 |
-57:25:57.2 |
HIP 54499 |
18.37 |
| 2026-04-15 12:00 |
11:11:06.89 |
-57:25:07.8 |
HIP 54499 |
17.18 |
| 2026-04-16 00:00 |
11:10:58.23 |
-57:24:17.9 |
HIP 54499 |
16.04 |