P/2022 C2 (PANSTARRS)
メタデータ
| 項目 |
値 |
| Designation |
P/2022 C2 (PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2022-08-06T14:14:16.523520Z |
| Orbit solution date (soln_date, UTC) |
2023-11-12T20:43:31Z |
| Obs used |
255 |
| NEO |
- |
| M1 |
7.100 |
| K1 |
18.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2022-02-02T13:07:46.243200Z |
| Discovery magnitude (MPC) |
20.84 w |
| Discovery observatory (MPC) |
F52 · Pan-STARRS 2, Haleakala |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2022-04-22.0000000 |
| e |
0.44280537 |
| q (au) |
3.370418 |
| a (au) |
6.048907 |
| i (deg) |
9.979754 |
| Ω (om, deg) |
135.274414 |
| ω (w, deg) |
89.300280 |
| M (ma, deg) |
352.938151 |
等級
散乱 + 全体線形
$$
M_a = (7.861 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
7.861 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.869 |
| 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) |
| 2026-02-03 00:00 |
23:36:27.77 |
-08:58:50.8 |
HIP 116470 |
14.56 |
| 2026-02-03 12:00 |
23:36:43.91 |
-08:57:02.8 |
HIP 116470 |
15.46 |
| 2026-02-04 00:00 |
23:37:00.10 |
-08:55:14.6 |
HIP 116470 |
17.45 |
| 2026-02-04 12:00 |
23:37:16.35 |
-08:53:26.2 |
HIP 116470 |
20.23 |
| 2026-02-05 00:00 |
23:37:32.64 |
-08:51:37.6 |
HIP 116639 |
17.08 |
| 2026-02-05 12:00 |
23:37:48.98 |
-08:49:48.8 |
HIP 116639 |
13.47 |
| 2026-02-06 00:00 |
23:38:05.37 |
-08:47:59.9 |
HIP 116639 |
10.49 |
| 2026-02-06 12:00 |
23:38:21.81 |
-08:46:10.8 |
HIP 116639 |
8.84 |
| 2026-02-07 00:00 |
23:38:38.30 |
-08:44:21.4 |
HIP 116639 |
9.27 |
| 2026-02-07 12:00 |
23:38:54.83 |
-08:42:32.0 |
HIP 116639 |
11.57 |
| 2026-02-08 00:00 |
23:39:11.41 |
-08:40:42.3 |
HIP 116639 |
14.90 |
| 2026-02-08 12:00 |
23:39:28.03 |
-08:38:52.5 |
HIP 116639 |
18.74 |
| 2026-02-09 00:00 |
23:39:44.70 |
-08:37:02.6 |
HIP 116639 |
22.83 |
| 2026-02-09 12:00 |
23:40:01.42 |
-08:35:12.4 |
HIP 116639 |
27.06 |
| 2026-02-10 00:00 |
23:40:18.17 |
-08:33:22.2 |
HIP 116891 |
25.09 |
| 2026-02-10 12:00 |
23:40:34.97 |
-08:31:31.8 |
HIP 116891 |
23.45 |
| 2026-02-11 00:00 |
23:40:51.81 |
-08:29:41.2 |
HIP 116891 |
22.62 |
| 2026-02-11 12:00 |
23:41:08.70 |
-08:27:50.6 |
HIP 116891 |
22.68 |
| 2026-02-12 00:00 |
23:41:25.62 |
-08:25:59.8 |
HIP 116891 |
23.64 |
| 2026-02-12 12:00 |
23:41:42.58 |
-08:24:08.8 |
HIP 116891 |
25.41 |
| 2026-02-13 00:00 |
23:41:59.59 |
-08:22:17.8 |
HIP 116891 |
27.82 |
| 2026-02-13 12:00 |
23:42:16.63 |
-08:20:26.6 |
HIP 117076 |
26.36 |
| 2026-02-14 00:00 |
23:42:33.71 |
-08:18:35.3 |
HIP 117076 |
21.93 |
| 2026-02-14 12:00 |
23:42:50.83 |
-08:16:44.0 |
HIP 117076 |
17.58 |
| 2026-02-15 00:00 |
23:43:07.99 |
-08:14:52.5 |
HIP 117076 |
13.41 |
| 2026-02-15 12:00 |
23:43:25.18 |
-08:13:00.9 |
HIP 117076 |
9.66 |
| 2026-02-16 00:00 |
23:43:42.40 |
-08:11:09.2 |
HIP 117076 |
7.06 |
| 2026-02-16 12:00 |
23:43:59.67 |
-08:09:17.5 |
HIP 117076 |
7.04 |
| 2026-02-17 00:00 |
23:44:16.96 |
-08:07:25.6 |
HIP 117076 |
9.63 |
| 2026-02-17 12:00 |
23:44:34.29 |
-08:05:33.7 |
HIP 117076 |
13.41 |
| 2026-02-18 00:00 |
23:44:51.66 |
-08:03:41.7 |
HIP 117076 |
17.63 |
| 2026-02-18 12:00 |
23:45:09.05 |
-08:01:49.7 |
HIP 117076 |
22.05 |
| 2026-02-19 00:00 |
23:45:26.48 |
-07:59:57.5 |
HIP 117076 |
26.56 |
| 2026-02-19 12:00 |
23:45:43.93 |
-07:58:05.4 |
HIP 117317 |
24.43 |
| 2026-02-20 00:00 |
23:46:01.42 |
-07:56:13.1 |
HIP 117317 |
21.06 |
| 2026-02-20 12:00 |
23:46:18.94 |
-07:54:20.9 |
HIP 117317 |
18.28 |
| 2026-02-21 00:00 |
23:46:36.48 |
-07:52:28.6 |
HIP 117317 |
16.41 |
| 2026-02-21 12:00 |
23:46:54.06 |
-07:50:36.2 |
HIP 117317 |
15.79 |
| 2026-02-22 00:00 |
23:47:11.65 |
-07:48:43.8 |
HIP 117317 |
16.55 |
| 2026-02-22 12:00 |
23:47:29.28 |
-07:46:51.4 |
HIP 117317 |
18.54 |
| 2026-02-23 00:00 |
23:47:46.93 |
-07:44:59.0 |
HIP 117317 |
21.42 |
| 2026-02-23 12:00 |
23:48:04.61 |
-07:43:06.6 |
HIP 117446 |
21.43 |
| 2026-02-24 00:00 |
23:48:22.31 |
-07:41:14.1 |
HIP 117446 |
17.77 |