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) |
| 2026-06-01 00:00 |
00:41:33.07 |
-02:55:54.9 |
HIP 3311 |
11.79 |
| 2026-06-01 12:00 |
00:41:44.73 |
-02:55:14.6 |
HIP 3311 |
10.23 |
| 2026-06-02 00:00 |
00:41:56.31 |
-02:54:35.0 |
HIP 3311 |
9.39 |
| 2026-06-02 12:00 |
00:42:07.80 |
-02:53:56.1 |
HIP 3311 |
9.44 |
| 2026-06-03 00:00 |
00:42:19.21 |
-02:53:17.9 |
HIP 3311 |
10.34 |
| 2026-06-03 12:00 |
00:42:30.53 |
-02:52:40.5 |
HIP 3311 |
11.89 |
| 2026-06-04 00:00 |
00:42:41.76 |
-02:52:03.7 |
HIP 3311 |
13.85 |
| 2026-06-04 12:00 |
00:42:52.91 |
-02:51:27.6 |
HIP 3311 |
16.06 |
| 2026-06-05 00:00 |
00:43:03.97 |
-02:50:52.3 |
HIP 3435 |
18.03 |
| 2026-06-05 12:00 |
00:43:14.94 |
-02:50:17.7 |
HIP 3435 |
16.91 |
| 2026-06-06 00:00 |
00:43:25.82 |
-02:49:43.8 |
HIP 3435 |
16.20 |
| 2026-06-06 12:00 |
00:43:36.61 |
-02:49:10.7 |
HIP 3435 |
15.94 |
| 2026-06-07 00:00 |
00:43:47.32 |
-02:48:38.2 |
HIP 3435 |
16.14 |
| 2026-06-07 12:00 |
00:43:57.93 |
-02:48:06.6 |
HIP 3435 |
16.77 |
| 2026-06-08 00:00 |
00:44:08.45 |
-02:47:35.6 |
HIP 3435 |
17.77 |
| 2026-06-08 12:00 |
00:44:18.88 |
-02:47:05.4 |
HIP 3435 |
19.08 |
| 2026-06-09 00:00 |
00:44:29.22 |
-02:46:35.9 |
HIP 3435 |
20.63 |
| 2026-06-09 12:00 |
00:44:39.46 |
-02:46:07.2 |
HIP 3435 |
22.36 |
| 2026-06-10 00:00 |
00:44:49.61 |
-02:45:39.2 |
HIP 3435 |
24.22 |
| 2026-06-10 12:00 |
00:44:59.67 |
-02:45:12.0 |
HIP 3435 |
26.17 |
| 2026-06-11 00:00 |
00:45:09.63 |
-02:44:45.5 |
HIP 3435 |
28.20 |
| 2026-06-11 12:00 |
00:45:19.50 |
-02:44:19.8 |
HIP 3435 |
30.27 |
| 2026-06-12 00:00 |
00:45:29.27 |
-02:43:54.9 |
HIP 3435 |
32.38 |
| 2026-06-12 12:00 |
00:45:38.95 |
-02:43:30.7 |
HIP 3435 |
34.51 |
| 2026-06-13 00:00 |
00:45:48.52 |
-02:43:07.3 |
HIP 3708 |
36.05 |
| 2026-06-13 12:00 |
00:45:58.00 |
-02:42:44.6 |
HIP 3708 |
34.04 |
| 2026-06-14 00:00 |
00:46:07.39 |
-02:42:22.7 |
HIP 3708 |
32.12 |
| 2026-06-14 12:00 |
00:46:16.67 |
-02:42:01.6 |
HIP 3708 |
30.29 |
| 2026-06-15 00:00 |
00:46:25.85 |
-02:41:41.3 |
HIP 3708 |
28.56 |
| 2026-06-15 12:00 |
00:46:34.94 |
-02:41:21.7 |
HIP 3708 |
26.94 |
| 2026-06-16 00:00 |
00:46:43.92 |
-02:41:03.0 |
HIP 3708 |
25.45 |
| 2026-06-16 12:00 |
00:46:52.80 |
-02:40:45.0 |
HIP 3708 |
24.10 |
| 2026-06-17 00:00 |
00:47:01.58 |
-02:40:27.8 |
HIP 3708 |
22.92 |
| 2026-06-17 12:00 |
00:47:10.26 |
-02:40:11.4 |
HIP 3708 |
21.91 |
| 2026-06-18 00:00 |
00:47:18.84 |
-02:39:55.7 |
HIP 3708 |
21.10 |
| 2026-06-18 12:00 |
00:47:27.31 |
-02:39:40.9 |
HIP 3708 |
20.51 |
| 2026-06-19 00:00 |
00:47:35.68 |
-02:39:26.8 |
HIP 3708 |
20.14 |
| 2026-06-19 12:00 |
00:47:43.95 |
-02:39:13.5 |
HIP 3708 |
19.99 |
| 2026-06-20 00:00 |
00:47:52.11 |
-02:39:01.0 |
HIP 3708 |
20.07 |
| 2026-06-20 12:00 |
00:48:00.16 |
-02:38:49.3 |
HIP 3708 |
20.36 |
| 2026-06-21 00:00 |
00:48:08.11 |
-02:38:38.4 |
HIP 3708 |
20.84 |
| 2026-06-21 12:00 |
00:48:15.96 |
-02:38:28.3 |
HIP 3708 |
21.50 |
| 2026-06-22 00:00 |
00:48:23.70 |
-02:38:19.0 |
HIP 3708 |
22.31 |