メタデータ
| 項目 |
値 |
| Designation |
P/2022 O2 (PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2023-01-07T02:42:09.590400Z |
| Orbit solution date (soln_date, UTC) |
2023-04-21T18:43:49Z |
| Obs used |
95 |
| NEO |
- |
| M1 |
12.700 |
| K1 |
19.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2022-07-21T09:38:06.057600Z |
| Discovery magnitude (MPC) |
20.85 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) |
2022-10-21.0000000 |
| e |
0.72168447 |
| q (au) |
1.756806 |
| a (au) |
6.312283 |
| i (deg) |
9.425474 |
| Ω (om, deg) |
330.499830 |
| ω (w, deg) |
48.642131 |
| M (ma, deg) |
355.145488 |
等級
散乱 + 全体線形
$$
M_a = (12.985 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
12.985 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.500 |
| 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 |
11:06:48.21 |
+02:18:33.2 |
HIP 54281 |
9.71 |
| 2026-07-29 12:00 |
11:06:59.73 |
+02:17:20.9 |
HIP 54281 |
12.79 |
| 2026-07-30 00:00 |
11:07:11.30 |
+02:16:08.2 |
HIP 54281 |
15.90 |
| 2026-07-30 12:00 |
11:07:22.92 |
+02:14:55.1 |
HIP 54336 |
18.96 |
| 2026-07-31 00:00 |
11:07:34.57 |
+02:13:41.7 |
HIP 54336 |
19.18 |
| 2026-07-31 12:00 |
11:07:46.28 |
+02:12:28.0 |
HIP 54336 |
19.91 |
| 2026-08-01 00:00 |
11:07:58.02 |
+02:11:13.9 |
HIP 54336 |
21.10 |
| 2026-08-01 12:00 |
11:08:09.81 |
+02:09:59.4 |
HIP 54336 |
22.68 |
| 2026-08-02 00:00 |
11:08:21.64 |
+02:08:44.6 |
HIP 54336 |
24.59 |
| 2026-08-02 12:00 |
11:08:33.51 |
+02:07:29.4 |
HIP 54541 |
25.97 |
| 2026-08-03 00:00 |
11:08:45.42 |
+02:06:13.9 |
HIP 54541 |
25.20 |
| 2026-08-03 12:00 |
11:08:57.38 |
+02:04:58.1 |
HIP 54541 |
24.84 |
| 2026-08-04 00:00 |
11:09:09.37 |
+02:03:41.9 |
HIP 54541 |
24.91 |
| 2026-08-04 12:00 |
11:09:21.40 |
+02:02:25.4 |
HIP 54541 |
25.39 |
| 2026-08-05 00:00 |
11:09:33.47 |
+02:01:08.6 |
HIP 54541 |
26.28 |
| 2026-08-05 12:00 |
11:09:45.58 |
+01:59:51.4 |
HIP 54502 |
26.55 |
| 2026-08-06 00:00 |
11:09:57.73 |
+01:58:33.9 |
HIP 54675 |
23.95 |
| 2026-08-06 12:00 |
11:10:09.92 |
+01:57:16.1 |
HIP 54675 |
21.34 |
| 2026-08-07 00:00 |
11:10:22.14 |
+01:55:57.9 |
HIP 54675 |
18.94 |
| 2026-08-07 12:00 |
11:10:34.40 |
+01:54:39.5 |
HIP 54675 |
16.86 |
| 2026-08-08 00:00 |
11:10:46.70 |
+01:53:20.7 |
HIP 54675 |
15.22 |
| 2026-08-08 12:00 |
11:10:59.03 |
+01:52:01.6 |
HIP 54675 |
14.19 |
| 2026-08-09 00:00 |
11:11:11.39 |
+01:50:42.2 |
HIP 54675 |
13.92 |
| 2026-08-09 12:00 |
11:11:23.79 |
+01:49:22.5 |
HIP 54675 |
14.44 |
| 2026-08-10 00:00 |
11:11:36.23 |
+01:48:02.5 |
HIP 54675 |
15.70 |
| 2026-08-10 12:00 |
11:11:48.70 |
+01:46:42.2 |
HIP 54675 |
17.53 |
| 2026-08-11 00:00 |
11:12:01.20 |
+01:45:21.7 |
HIP 54675 |
19.79 |
| 2026-08-11 12:00 |
11:12:13.73 |
+01:44:00.8 |
HIP 54675 |
22.35 |
| 2026-08-12 00:00 |
11:12:26.30 |
+01:42:39.6 |
HIP 54675 |
25.12 |
| 2026-08-12 12:00 |
11:12:38.89 |
+01:41:18.1 |
HIP 54675 |
28.04 |
| 2026-08-13 00:00 |
11:12:51.52 |
+01:39:56.4 |
HIP 54675 |
31.07 |
| 2026-08-13 12:00 |
11:13:04.17 |
+01:38:34.4 |
HIP 54675 |
34.19 |
| 2026-08-14 00:00 |
11:13:16.86 |
+01:37:12.1 |
HIP 54675 |
37.37 |
| 2026-08-14 12:00 |
11:13:29.57 |
+01:35:49.5 |
HIP 54961 |
38.94 |
| 2026-08-15 00:00 |
11:13:42.31 |
+01:34:26.7 |
HIP 54961 |
37.86 |
| 2026-08-15 12:00 |
11:13:55.08 |
+01:33:03.6 |
HIP 54961 |
37.07 |
| 2026-08-16 00:00 |
11:14:07.88 |
+01:31:40.2 |
HIP 54961 |
36.60 |
| 2026-08-16 12:00 |
11:14:20.70 |
+01:30:16.6 |
HIP 54961 |
36.46 |
| 2026-08-17 00:00 |
11:14:33.55 |
+01:28:52.8 |
HIP 54889 |
35.83 |
| 2026-08-17 12:00 |
11:14:46.42 |
+01:27:28.7 |
HIP 54889 |
34.90 |
| 2026-08-18 00:00 |
11:14:59.32 |
+01:26:04.3 |
HIP 54889 |
34.29 |
| 2026-08-18 12:00 |
11:15:12.24 |
+01:24:39.7 |
HIP 54889 |
34.04 |
| 2026-08-19 00:00 |
11:15:25.19 |
+01:23:14.9 |
HIP 54889 |
34.16 |