メタデータ
| 項目 |
値 |
| Designation |
P/2022 P2 (ZTF) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2022-07-10T18:54:03.015360Z |
| Orbit solution date (soln_date, UTC) |
2026-03-07T11:43:02Z |
| Obs used |
162 |
| NEO |
- |
| M1 |
9.200 |
| K1 |
21.750 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2022-08-15T12:02:27.830400Z |
| Discovery magnitude (MPC) |
18.50 r |
| Discovery observatory (MPC) |
I41 · Palomar Mountain–ZTF |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2022-10-22.0000000 |
| e |
0.55792224 |
| q (au) |
1.982270 |
| a (au) |
4.483984 |
| i (deg) |
12.442878 |
| Ω (om, deg) |
291.231134 |
| ω (w, deg) |
137.589908 |
| M (ma, deg) |
10.713716 |
等級
散乱 + 全体線形
$$
M_a = (11.163 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
11.163 |
| n |
6.000 |
| gf |
0.800 |
| gb |
-0.500 |
| k |
1.000 |
| δ90 |
1.000 |
| 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 |
15:06:44.78 |
-28:09:23.0 |
HIP 73889 |
11.62 |
| 2026-07-29 12:00 |
15:06:45.68 |
-28:08:30.8 |
HIP 73889 |
12.38 |
| 2026-07-30 00:00 |
15:06:46.74 |
-28:07:39.2 |
HIP 73889 |
13.16 |
| 2026-07-30 12:00 |
15:06:47.95 |
-28:06:48.3 |
HIP 73889 |
13.98 |
| 2026-07-31 00:00 |
15:06:49.32 |
-28:05:57.9 |
HIP 73889 |
14.82 |
| 2026-07-31 12:00 |
15:06:50.84 |
-28:05:08.2 |
HIP 73889 |
15.67 |
| 2026-08-01 00:00 |
15:06:52.52 |
-28:04:19.2 |
HIP 73889 |
16.55 |
| 2026-08-01 12:00 |
15:06:54.36 |
-28:03:30.7 |
HIP 73889 |
17.43 |
| 2026-08-02 00:00 |
15:06:56.35 |
-28:02:42.9 |
HIP 73889 |
18.34 |
| 2026-08-02 12:00 |
15:06:58.49 |
-28:01:55.7 |
HIP 73889 |
19.25 |
| 2026-08-03 00:00 |
15:07:00.78 |
-28:01:09.2 |
HIP 73889 |
20.17 |
| 2026-08-03 12:00 |
15:07:03.23 |
-28:00:23.3 |
HIP 73889 |
21.11 |
| 2026-08-04 00:00 |
15:07:05.83 |
-27:59:38.0 |
HIP 73889 |
22.06 |
| 2026-08-04 12:00 |
15:07:08.58 |
-27:58:53.4 |
HIP 73889 |
23.02 |
| 2026-08-05 00:00 |
15:07:11.49 |
-27:58:09.4 |
HIP 73889 |
23.99 |
| 2026-08-05 12:00 |
15:07:14.55 |
-27:57:26.1 |
HIP 73889 |
24.97 |
| 2026-08-06 00:00 |
15:07:17.76 |
-27:56:43.4 |
HIP 73889 |
25.96 |
| 2026-08-06 12:00 |
15:07:21.12 |
-27:56:01.4 |
HIP 73889 |
26.97 |
| 2026-08-07 00:00 |
15:07:24.63 |
-27:55:20.0 |
HIP 73981 |
26.94 |
| 2026-08-07 12:00 |
15:07:28.29 |
-27:54:39.3 |
HIP 73981 |
26.39 |
| 2026-08-08 00:00 |
15:07:32.10 |
-27:53:59.2 |
HIP 73981 |
25.89 |
| 2026-08-08 12:00 |
15:07:36.06 |
-27:53:19.7 |
HIP 73981 |
25.45 |
| 2026-08-09 00:00 |
15:07:40.17 |
-27:52:41.0 |
HIP 73981 |
25.06 |
| 2026-08-09 12:00 |
15:07:44.43 |
-27:52:02.8 |
HIP 73981 |
24.74 |
| 2026-08-10 00:00 |
15:07:48.84 |
-27:51:25.4 |
HIP 73981 |
24.49 |
| 2026-08-10 12:00 |
15:07:53.39 |
-27:50:48.6 |
HIP 73981 |
24.32 |
| 2026-08-11 00:00 |
15:07:58.10 |
-27:50:12.4 |
HIP 73981 |
24.23 |
| 2026-08-11 12:00 |
15:08:02.95 |
-27:49:36.9 |
HIP 73981 |
24.22 |
| 2026-08-12 00:00 |
15:08:07.95 |
-27:49:02.1 |
HIP 73981 |
24.31 |
| 2026-08-12 12:00 |
15:08:13.09 |
-27:48:27.9 |
HIP 73981 |
24.48 |
| 2026-08-13 00:00 |
15:08:18.38 |
-27:47:54.4 |
HIP 73981 |
24.75 |
| 2026-08-13 12:00 |
15:08:23.81 |
-27:47:21.5 |
HIP 73981 |
25.11 |
| 2026-08-14 00:00 |
15:08:29.39 |
-27:46:49.3 |
HIP 73981 |
25.57 |
| 2026-08-14 12:00 |
15:08:35.12 |
-27:46:17.8 |
HIP 73981 |
26.12 |
| 2026-08-15 00:00 |
15:08:40.98 |
-27:45:46.9 |
HIP 73981 |
26.76 |
| 2026-08-15 12:00 |
15:08:46.99 |
-27:45:16.7 |
HIP 73981 |
27.49 |
| 2026-08-16 00:00 |
15:08:53.15 |
-27:44:47.1 |
HIP 73981 |
28.30 |
| 2026-08-16 12:00 |
15:08:59.44 |
-27:44:18.2 |
HIP 73981 |
29.19 |
| 2026-08-17 00:00 |
15:09:05.87 |
-27:43:49.9 |
HIP 73981 |
30.17 |
| 2026-08-17 12:00 |
15:09:12.45 |
-27:43:22.3 |
HIP 73981 |
31.21 |
| 2026-08-18 00:00 |
15:09:19.16 |
-27:42:55.4 |
HIP 74318 |
31.46 |
| 2026-08-18 12:00 |
15:09:26.02 |
-27:42:29.1 |
HIP 74318 |
29.92 |
| 2026-08-19 00:00 |
15:09:33.01 |
-27:42:03.4 |
HIP 74318 |
28.36 |