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) |
| 2026-07-29 00:00 |
12:07:44.74 |
-07:00:16.9 |
HIP 59209 |
15.43 |
| 2026-07-29 12:00 |
12:07:51.17 |
-07:00:57.8 |
HIP 59209 |
14.61 |
| 2026-07-30 00:00 |
12:07:57.66 |
-07:01:39.1 |
HIP 59209 |
13.95 |
| 2026-07-30 12:00 |
12:08:04.19 |
-07:02:20.8 |
HIP 59209 |
13.49 |
| 2026-07-31 00:00 |
12:08:10.78 |
-07:03:02.9 |
HIP 59209 |
13.25 |
| 2026-07-31 12:00 |
12:08:17.42 |
-07:03:45.4 |
HIP 59209 |
13.25 |
| 2026-08-01 00:00 |
12:08:24.10 |
-07:04:28.3 |
HIP 59209 |
13.49 |
| 2026-08-01 12:00 |
12:08:30.84 |
-07:05:11.5 |
HIP 59209 |
13.97 |
| 2026-08-02 00:00 |
12:08:37.62 |
-07:05:55.1 |
HIP 59209 |
14.66 |
| 2026-08-02 12:00 |
12:08:44.45 |
-07:06:39.1 |
HIP 59209 |
15.56 |
| 2026-08-03 00:00 |
12:08:51.33 |
-07:07:23.5 |
HIP 59209 |
16.61 |
| 2026-08-03 12:00 |
12:08:58.26 |
-07:08:08.2 |
HIP 59209 |
17.81 |
| 2026-08-04 00:00 |
12:09:05.23 |
-07:08:53.4 |
HIP 59209 |
19.13 |
| 2026-08-04 12:00 |
12:09:12.25 |
-07:09:38.8 |
HIP 59209 |
20.55 |
| 2026-08-05 00:00 |
12:09:19.32 |
-07:10:24.7 |
HIP 59209 |
22.05 |
| 2026-08-05 12:00 |
12:09:26.43 |
-07:11:10.9 |
HIP 59209 |
23.62 |
| 2026-08-06 00:00 |
12:09:33.59 |
-07:11:57.5 |
HIP 59209 |
25.26 |
| 2026-08-06 12:00 |
12:09:40.79 |
-07:12:44.4 |
HIP 59209 |
26.94 |
| 2026-08-07 00:00 |
12:09:48.04 |
-07:13:31.7 |
HIP 59209 |
28.67 |
| 2026-08-07 12:00 |
12:09:55.33 |
-07:14:19.4 |
HIP 59209 |
30.44 |
| 2026-08-08 00:00 |
12:10:02.67 |
-07:15:07.4 |
HIP 59346 |
31.90 |
| 2026-08-08 12:00 |
12:10:10.05 |
-07:15:55.8 |
HIP 59346 |
30.81 |
| 2026-08-09 00:00 |
12:10:17.47 |
-07:16:44.5 |
HIP 59346 |
29.80 |
| 2026-08-09 12:00 |
12:10:24.94 |
-07:17:33.6 |
HIP 59346 |
28.89 |
| 2026-08-10 00:00 |
12:10:32.45 |
-07:18:23.0 |
HIP 59346 |
28.09 |
| 2026-08-10 12:00 |
12:10:40.00 |
-07:19:12.8 |
HIP 59346 |
27.41 |
| 2026-08-11 00:00 |
12:10:47.60 |
-07:20:02.9 |
HIP 59346 |
26.87 |
| 2026-08-11 12:00 |
12:10:55.23 |
-07:20:53.4 |
HIP 59346 |
26.48 |
| 2026-08-12 00:00 |
12:11:02.91 |
-07:21:44.2 |
HIP 59346 |
26.24 |
| 2026-08-12 12:00 |
12:11:10.62 |
-07:22:35.3 |
HIP 59346 |
26.17 |
| 2026-08-13 00:00 |
12:11:18.38 |
-07:23:26.7 |
HIP 59346 |
26.26 |
| 2026-08-13 12:00 |
12:11:26.17 |
-07:24:18.5 |
HIP 59346 |
26.52 |
| 2026-08-14 00:00 |
12:11:34.01 |
-07:25:10.7 |
HIP 59346 |
26.95 |
| 2026-08-14 12:00 |
12:11:41.88 |
-07:26:03.1 |
HIP 59507 |
27.24 |
| 2026-08-15 00:00 |
12:11:49.79 |
-07:26:55.9 |
HIP 59507 |
27.58 |
| 2026-08-15 12:00 |
12:11:57.74 |
-07:27:49.0 |
HIP 59507 |
28.07 |
| 2026-08-16 00:00 |
12:12:05.72 |
-07:28:42.4 |
HIP 59507 |
28.73 |
| 2026-08-16 12:00 |
12:12:13.75 |
-07:29:36.1 |
HIP 59559 |
28.89 |
| 2026-08-17 00:00 |
12:12:21.80 |
-07:30:30.2 |
HIP 59559 |
29.17 |
| 2026-08-17 12:00 |
12:12:29.90 |
-07:31:24.5 |
HIP 59559 |
29.61 |
| 2026-08-18 00:00 |
12:12:38.03 |
-07:32:19.2 |
HIP 59559 |
30.21 |
| 2026-08-18 12:00 |
12:12:46.19 |
-07:33:14.1 |
HIP 59559 |
30.96 |
| 2026-08-19 00:00 |
12:12:54.39 |
-07:34:09.4 |
HIP 59559 |
31.86 |