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 |
-0.998 |
| 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) |
| 2026-05-12 00:00 |
12:04:47.39 |
-06:46:46.4 |
HIP 58824 |
16.17 |
| 2026-05-12 12:00 |
12:04:42.60 |
-06:46:16.2 |
HIP 58824 |
15.50 |
| 2026-05-13 00:00 |
12:04:37.88 |
-06:45:46.4 |
HIP 58824 |
14.91 |
| 2026-05-13 12:00 |
12:04:33.24 |
-06:45:17.0 |
HIP 58824 |
14.42 |
| 2026-05-14 00:00 |
12:04:28.67 |
-06:44:48.0 |
HIP 58824 |
14.04 |
| 2026-05-14 12:00 |
12:04:24.18 |
-06:44:19.3 |
HIP 58824 |
13.76 |
| 2026-05-15 00:00 |
12:04:19.76 |
-06:43:51.0 |
HIP 58824 |
13.59 |
| 2026-05-15 12:00 |
12:04:15.42 |
-06:43:23.2 |
HIP 58824 |
13.52 |
| 2026-05-16 00:00 |
12:04:11.16 |
-06:42:55.7 |
HIP 58824 |
13.55 |
| 2026-05-16 12:00 |
12:04:06.98 |
-06:42:28.6 |
HIP 58824 |
13.68 |
| 2026-05-17 00:00 |
12:04:02.87 |
-06:42:02.0 |
HIP 58824 |
13.90 |
| 2026-05-17 12:00 |
12:03:58.84 |
-06:41:35.7 |
HIP 58824 |
14.20 |
| 2026-05-18 00:00 |
12:03:54.88 |
-06:41:09.9 |
HIP 58824 |
14.56 |
| 2026-05-18 12:00 |
12:03:51.01 |
-06:40:44.5 |
HIP 58824 |
14.99 |
| 2026-05-19 00:00 |
12:03:47.21 |
-06:40:19.4 |
HIP 58824 |
15.47 |
| 2026-05-19 12:00 |
12:03:43.49 |
-06:39:54.9 |
HIP 58824 |
15.99 |
| 2026-05-20 00:00 |
12:03:39.85 |
-06:39:30.7 |
HIP 58824 |
16.54 |
| 2026-05-20 12:00 |
12:03:36.29 |
-06:39:06.9 |
HIP 58728 |
16.77 |
| 2026-05-21 00:00 |
12:03:32.81 |
-06:38:43.6 |
HIP 58728 |
15.87 |
| 2026-05-21 12:00 |
12:03:29.41 |
-06:38:20.8 |
HIP 58728 |
14.99 |
| 2026-05-22 00:00 |
12:03:26.08 |
-06:37:58.3 |
HIP 58728 |
14.14 |
| 2026-05-22 12:00 |
12:03:22.84 |
-06:37:36.3 |
HIP 58728 |
13.32 |
| 2026-05-23 00:00 |
12:03:19.67 |
-06:37:14.7 |
HIP 58728 |
12.52 |
| 2026-05-23 12:00 |
12:03:16.59 |
-06:36:53.6 |
HIP 58728 |
11.75 |
| 2026-05-24 00:00 |
12:03:13.58 |
-06:36:32.9 |
HIP 58728 |
11.01 |
| 2026-05-24 12:00 |
12:03:10.66 |
-06:36:12.6 |
HIP 58728 |
10.30 |
| 2026-05-25 00:00 |
12:03:07.81 |
-06:35:52.8 |
HIP 58728 |
9.62 |
| 2026-05-25 12:00 |
12:03:05.05 |
-06:35:33.5 |
HIP 58728 |
8.97 |
| 2026-05-26 00:00 |
12:03:02.36 |
-06:35:14.6 |
HIP 58728 |
8.36 |
| 2026-05-26 12:00 |
12:02:59.75 |
-06:34:56.1 |
HIP 58728 |
7.79 |
| 2026-05-27 00:00 |
12:02:57.23 |
-06:34:38.1 |
HIP 58728 |
7.25 |
| 2026-05-27 12:00 |
12:02:54.78 |
-06:34:20.5 |
HIP 58728 |
6.76 |
| 2026-05-28 00:00 |
12:02:52.42 |
-06:34:03.4 |
HIP 58728 |
6.32 |
| 2026-05-28 12:00 |
12:02:50.13 |
-06:33:46.8 |
HIP 58728 |
5.92 |
| 2026-05-29 00:00 |
12:02:47.93 |
-06:33:30.6 |
HIP 58728 |
5.58 |
| 2026-05-29 12:00 |
12:02:45.80 |
-06:33:14.9 |
HIP 58728 |
5.30 |
| 2026-05-30 00:00 |
12:02:43.76 |
-06:32:59.6 |
HIP 58728 |
5.07 |
| 2026-05-30 12:00 |
12:02:41.79 |
-06:32:44.8 |
HIP 58728 |
4.90 |
| 2026-05-31 00:00 |
12:02:39.91 |
-06:32:30.4 |
HIP 58728 |
4.79 |
| 2026-05-31 12:00 |
12:02:38.10 |
-06:32:16.6 |
HIP 58728 |
4.74 |
| 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 |