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) |
| 2026-09-20 00:00 |
11:22:14.73 |
-54:30:23.4 |
HIP 55476 |
9.56 |
| 2026-09-20 12:00 |
11:22:22.86 |
-54:31:02.0 |
HIP 55476 |
10.75 |
| 2026-09-21 00:00 |
11:22:30.98 |
-54:31:41.2 |
HIP 55476 |
11.98 |
| 2026-09-21 12:00 |
11:22:39.09 |
-54:32:20.9 |
HIP 55476 |
13.23 |
| 2026-09-22 00:00 |
11:22:47.19 |
-54:33:01.2 |
HIP 55476 |
14.51 |
| 2026-09-22 12:00 |
11:22:55.28 |
-54:33:41.9 |
HIP 55476 |
15.81 |
| 2026-09-23 00:00 |
11:23:03.36 |
-54:34:23.2 |
HIP 55476 |
17.11 |
| 2026-09-23 12:00 |
11:23:11.43 |
-54:35:05.0 |
HIP 55476 |
18.44 |
| 2026-09-24 00:00 |
11:23:19.48 |
-54:35:47.3 |
HIP 55476 |
19.77 |
| 2026-09-24 12:00 |
11:23:27.53 |
-54:36:30.1 |
HIP 55476 |
21.11 |
| 2026-09-25 00:00 |
11:23:35.56 |
-54:37:13.4 |
HIP 55476 |
22.45 |
| 2026-09-25 12:00 |
11:23:43.57 |
-54:37:57.3 |
HIP 55476 |
23.81 |
| 2026-09-26 00:00 |
11:23:51.58 |
-54:38:41.6 |
HIP 55476 |
25.17 |
| 2026-09-26 12:00 |
11:23:59.57 |
-54:39:26.4 |
HIP 55476 |
26.53 |
| 2026-09-27 00:00 |
11:24:07.54 |
-54:40:11.8 |
HIP 55782 |
27.68 |
| 2026-09-27 12:00 |
11:24:15.51 |
-54:40:57.6 |
HIP 55782 |
27.77 |
| 2026-09-28 00:00 |
11:24:23.45 |
-54:41:44.0 |
HIP 55782 |
27.93 |
| 2026-09-28 12:00 |
11:24:31.38 |
-54:42:30.8 |
HIP 55782 |
28.17 |
| 2026-09-29 00:00 |
11:24:39.29 |
-54:43:18.1 |
HIP 55782 |
28.49 |
| 2026-09-29 12:00 |
11:24:47.19 |
-54:44:06.0 |
HIP 55782 |
28.88 |
| 2026-09-30 00:00 |
11:24:55.07 |
-54:44:54.3 |
HIP 55782 |
29.33 |
| 2026-09-30 12:00 |
11:25:02.93 |
-54:45:43.1 |
HIP 55782 |
29.86 |
| 2026-10-01 00:00 |
11:25:10.77 |
-54:46:32.4 |
HIP 55782 |
30.45 |
| 2026-10-01 12:00 |
11:25:18.60 |
-54:47:22.1 |
HIP 56005 |
29.30 |
| 2026-10-02 00:00 |
11:25:26.40 |
-54:48:12.4 |
HIP 56005 |
28.03 |
| 2026-10-02 12:00 |
11:25:34.19 |
-54:49:03.2 |
HIP 56005 |
26.79 |
| 2026-10-03 00:00 |
11:25:41.95 |
-54:49:54.4 |
HIP 56005 |
25.56 |
| 2026-10-03 12:00 |
11:25:49.70 |
-54:50:46.1 |
HIP 56005 |
24.36 |
| 2026-10-04 00:00 |
11:25:57.42 |
-54:51:38.2 |
HIP 56005 |
23.18 |
| 2026-10-04 12:00 |
11:26:05.12 |
-54:52:30.9 |
HIP 56005 |
22.03 |
| 2026-10-05 00:00 |
11:26:12.80 |
-54:53:24.0 |
HIP 56005 |
20.92 |
| 2026-10-05 12:00 |
11:26:20.46 |
-54:54:17.6 |
HIP 56005 |
19.85 |
| 2026-10-06 00:00 |
11:26:28.09 |
-54:55:11.7 |
HIP 56005 |
18.84 |
| 2026-10-06 12:00 |
11:26:35.70 |
-54:56:06.2 |
HIP 56005 |
17.88 |
| 2026-10-07 00:00 |
11:26:43.29 |
-54:57:01.2 |
HIP 56005 |
17.00 |
| 2026-10-07 12:00 |
11:26:50.85 |
-54:57:56.6 |
HIP 56005 |
16.20 |
| 2026-10-08 00:00 |
11:26:58.38 |
-54:58:52.5 |
HIP 56005 |
15.50 |
| 2026-10-08 12:00 |
11:27:05.89 |
-54:59:48.9 |
HIP 56005 |
14.91 |
| 2026-10-09 00:00 |
11:27:13.37 |
-55:00:45.7 |
HIP 56005 |
14.45 |
| 2026-10-09 12:00 |
11:27:20.82 |
-55:01:43.0 |
HIP 56005 |
14.12 |
| 2026-10-10 00:00 |
11:27:28.25 |
-55:02:40.7 |
HIP 56005 |
13.94 |
| 2026-10-10 12:00 |
11:27:35.65 |
-55:03:38.8 |
HIP 56005 |
13.92 |
| 2026-10-11 00:00 |
11:27:43.02 |
-55:04:37.4 |
HIP 56005 |
14.06 |