メタデータ
| 項目 |
値 |
| Designation |
C/2021 QM45 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2022-08-13T10:26:49.989120Z |
| Orbit solution date (soln_date, UTC) |
2023-03-20T19:42:38Z |
| Obs used |
382 |
| NEO |
- |
| M1 |
9.100 |
| K1 |
15.250 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2022-08-10.0000000 |
| e |
0.99216612 |
| q (au) |
2.773251 |
| a (au) |
354.007155 |
| i (deg) |
22.822373 |
| Ω (om, deg) |
354.588581 |
| ω (w, deg) |
72.804814 |
| M (ma, deg) |
359.999492 |
等級
散乱 + 全体線形
$$
M_a = (7.914 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
7.914 |
| 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) |
| 2026-06-01 00:00 |
12:02:36.38 |
-06:32:03.2 |
HIP 58728 |
4.74 |
| 2026-06-01 12:00 |
12:02:34.73 |
-06:31:50.2 |
HIP 58728 |
4.77 |
| 2026-06-02 00:00 |
12:02:33.17 |
-06:31:37.7 |
HIP 58728 |
4.85 |
| 2026-06-02 12:00 |
12:02:31.69 |
-06:31:25.7 |
HIP 58728 |
4.96 |
| 2026-06-03 00:00 |
12:02:30.28 |
-06:31:14.2 |
HIP 58728 |
5.08 |
| 2026-06-03 12:00 |
12:02:28.96 |
-06:31:03.1 |
HIP 58728 |
5.23 |
| 2026-06-04 00:00 |
12:02:27.72 |
-06:30:52.6 |
HIP 58728 |
5.38 |
| 2026-06-04 12:00 |
12:02:26.56 |
-06:30:42.4 |
HIP 58728 |
5.54 |
| 2026-06-05 00:00 |
12:02:25.47 |
-06:30:32.8 |
HIP 58728 |
5.70 |
| 2026-06-05 12:00 |
12:02:24.47 |
-06:30:23.7 |
HIP 58728 |
5.86 |
| 2026-06-06 00:00 |
12:02:23.55 |
-06:30:15.0 |
HIP 58728 |
6.01 |
| 2026-06-06 12:00 |
12:02:22.71 |
-06:30:06.8 |
HIP 58728 |
6.15 |
| 2026-06-07 00:00 |
12:02:21.94 |
-06:29:59.1 |
HIP 58728 |
6.29 |
| 2026-06-07 12:00 |
12:02:21.26 |
-06:29:51.8 |
HIP 58728 |
6.41 |
| 2026-06-08 00:00 |
12:02:20.66 |
-06:29:45.1 |
HIP 58728 |
6.52 |
| 2026-06-08 12:00 |
12:02:20.14 |
-06:29:38.8 |
HIP 58728 |
6.62 |
| 2026-06-09 00:00 |
12:02:19.69 |
-06:29:33.0 |
HIP 58728 |
6.70 |
| 2026-06-09 12:00 |
12:02:19.33 |
-06:29:27.7 |
HIP 58728 |
6.77 |
| 2026-06-10 00:00 |
12:02:19.05 |
-06:29:22.9 |
HIP 58728 |
6.82 |
| 2026-06-10 12:00 |
12:02:18.85 |
-06:29:18.6 |
HIP 58728 |
6.86 |
| 2026-06-11 00:00 |
12:02:18.72 |
-06:29:14.7 |
HIP 58728 |
6.87 |
| 2026-06-11 12:00 |
12:02:18.68 |
-06:29:11.4 |
HIP 58728 |
6.87 |
| 2026-06-12 00:00 |
12:02:18.71 |
-06:29:08.5 |
HIP 58728 |
6.86 |
| 2026-06-12 12:00 |
12:02:18.83 |
-06:29:06.2 |
HIP 58728 |
6.82 |
| 2026-06-13 00:00 |
12:02:19.02 |
-06:29:04.3 |
HIP 58728 |
6.77 |
| 2026-06-13 12:00 |
12:02:19.30 |
-06:29:02.9 |
HIP 58728 |
6.70 |
| 2026-06-14 00:00 |
12:02:19.65 |
-06:29:02.0 |
HIP 58728 |
6.61 |
| 2026-06-14 12:00 |
12:02:20.08 |
-06:29:01.7 |
HIP 58728 |
6.50 |
| 2026-06-15 00:00 |
12:02:20.60 |
-06:29:01.8 |
HIP 58728 |
6.38 |
| 2026-06-15 12:00 |
12:02:21.19 |
-06:29:02.4 |
HIP 58728 |
6.24 |
| 2026-06-16 00:00 |
12:02:21.85 |
-06:29:03.5 |
HIP 58728 |
6.08 |
| 2026-06-16 12:00 |
12:02:22.60 |
-06:29:05.1 |
HIP 58728 |
5.90 |
| 2026-06-17 00:00 |
12:02:23.43 |
-06:29:07.2 |
HIP 58728 |
5.70 |
| 2026-06-17 12:00 |
12:02:24.33 |
-06:29:09.8 |
HIP 58728 |
5.49 |
| 2026-06-18 00:00 |
12:02:25.31 |
-06:29:12.9 |
HIP 58728 |
5.27 |
| 2026-06-18 12:00 |
12:02:26.37 |
-06:29:16.4 |
HIP 58728 |
5.03 |
| 2026-06-19 00:00 |
12:02:27.51 |
-06:29:20.5 |
HIP 58728 |
4.78 |
| 2026-06-19 12:00 |
12:02:28.72 |
-06:29:25.1 |
HIP 58728 |
4.51 |
| 2026-06-20 00:00 |
12:02:30.02 |
-06:29:30.2 |
HIP 58728 |
4.24 |
| 2026-06-20 12:00 |
12:02:31.38 |
-06:29:35.7 |
HIP 58728 |
3.96 |
| 2026-06-21 00:00 |
12:02:32.83 |
-06:29:41.8 |
HIP 58728 |
3.69 |
| 2026-06-21 12:00 |
12:02:34.35 |
-06:29:48.3 |
HIP 58728 |
3.42 |
| 2026-06-22 00:00 |
12:02:35.95 |
-06:29:55.4 |
HIP 58728 |
3.16 |