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) |
| 2026-03-26 00:00 |
12:16:34.41 |
-07:50:51.7 |
HIP 59905 |
10.34 |
| 2026-03-26 12:00 |
12:16:25.27 |
-07:50:08.4 |
HIP 59905 |
12.46 |
| 2026-03-27 00:00 |
12:16:16.15 |
-07:49:25.0 |
HIP 59905 |
14.66 |
| 2026-03-27 12:00 |
12:16:07.03 |
-07:48:41.4 |
HIP 59905 |
16.90 |
| 2026-03-28 00:00 |
12:15:57.92 |
-07:47:57.7 |
HIP 59848 |
17.09 |
| 2026-03-28 12:00 |
12:15:48.82 |
-07:47:13.9 |
HIP 59848 |
17.34 |
| 2026-03-29 00:00 |
12:15:39.74 |
-07:46:30.0 |
HIP 59848 |
17.91 |
| 2026-03-29 12:00 |
12:15:30.66 |
-07:45:45.9 |
HIP 59848 |
18.75 |
| 2026-03-30 00:00 |
12:15:21.60 |
-07:45:01.8 |
HIP 59848 |
19.84 |
| 2026-03-30 12:00 |
12:15:12.56 |
-07:44:17.6 |
HIP 59848 |
21.13 |
| 2026-03-31 00:00 |
12:15:03.53 |
-07:43:33.3 |
HIP 59848 |
22.59 |
| 2026-03-31 12:00 |
12:14:54.51 |
-07:42:48.9 |
HIP 59848 |
24.19 |
| 2026-04-01 00:00 |
12:14:45.52 |
-07:42:04.5 |
HIP 59848 |
25.90 |
| 2026-04-01 12:00 |
12:14:36.54 |
-07:41:19.9 |
HIP 59743 |
26.96 |
| 2026-04-02 00:00 |
12:14:27.58 |
-07:40:35.4 |
HIP 59743 |
26.96 |
| 2026-04-02 12:00 |
12:14:18.64 |
-07:39:50.7 |
HIP 59743 |
27.17 |
| 2026-04-03 00:00 |
12:14:09.73 |
-07:39:06.1 |
HIP 59743 |
27.56 |
| 2026-04-03 12:00 |
12:14:00.83 |
-07:38:21.3 |
HIP 59743 |
28.15 |
| 2026-04-04 00:00 |
12:13:51.96 |
-07:37:36.6 |
HIP 59743 |
28.90 |
| 2026-04-04 12:00 |
12:13:43.11 |
-07:36:51.8 |
HIP 59743 |
29.81 |
| 2026-04-05 00:00 |
12:13:34.29 |
-07:36:07.0 |
HIP 59743 |
30.87 |
| 2026-04-05 12:00 |
12:13:25.49 |
-07:35:22.1 |
HIP 59743 |
32.05 |
| 2026-04-06 00:00 |
12:13:16.72 |
-07:34:37.3 |
HIP 59559 |
32.89 |
| 2026-04-06 12:00 |
12:13:07.97 |
-07:33:52.5 |
HIP 59559 |
31.82 |
| 2026-04-07 00:00 |
12:12:59.25 |
-07:33:07.6 |
HIP 59559 |
30.87 |
| 2026-04-07 12:00 |
12:12:50.57 |
-07:32:22.8 |
HIP 59559 |
30.07 |
| 2026-04-08 00:00 |
12:12:41.91 |
-07:31:37.9 |
HIP 59559 |
29.43 |
| 2026-04-08 12:00 |
12:12:33.28 |
-07:30:53.1 |
HIP 59559 |
28.95 |
| 2026-04-09 00:00 |
12:12:24.69 |
-07:30:08.3 |
HIP 59559 |
28.64 |
| 2026-04-09 12:00 |
12:12:16.13 |
-07:29:23.6 |
HIP 59559 |
28.51 |
| 2026-04-10 00:00 |
12:12:07.60 |
-07:28:38.9 |
HIP 59559 |
28.54 |
| 2026-04-10 12:00 |
12:11:59.10 |
-07:27:54.2 |
HIP 59507 |
28.11 |
| 2026-04-11 00:00 |
12:11:50.64 |
-07:27:09.6 |
HIP 59507 |
27.75 |
| 2026-04-11 12:00 |
12:11:42.22 |
-07:26:25.0 |
HIP 59346 |
27.33 |
| 2026-04-12 00:00 |
12:11:33.84 |
-07:25:40.5 |
HIP 59346 |
26.53 |
| 2026-04-12 12:00 |
12:11:25.49 |
-07:24:56.0 |
HIP 59346 |
25.91 |
| 2026-04-13 00:00 |
12:11:17.18 |
-07:24:11.7 |
HIP 59346 |
25.46 |
| 2026-04-13 12:00 |
12:11:08.91 |
-07:23:27.4 |
HIP 59346 |
25.20 |
| 2026-04-14 00:00 |
12:11:00.69 |
-07:22:43.2 |
HIP 59346 |
25.13 |
| 2026-04-14 12:00 |
12:10:52.50 |
-07:21:59.1 |
HIP 59346 |
25.25 |
| 2026-04-15 00:00 |
12:10:44.36 |
-07:21:15.1 |
HIP 59346 |
25.55 |
| 2026-04-15 12:00 |
12:10:36.26 |
-07:20:31.2 |
HIP 59346 |
26.02 |
| 2026-04-16 00:00 |
12:10:28.20 |
-07:19:47.4 |
HIP 59346 |
26.65 |