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) |
| 2026-09-20 00:00 |
15:21:18.29 |
-27:35:43.8 |
HIP 75172 |
5.51 |
| 2026-09-20 12:00 |
15:21:32.87 |
-27:35:55.8 |
HIP 75172 |
2.86 |
| 2026-09-21 00:00 |
15:21:47.56 |
-27:36:08.3 |
HIP 75172 |
2.66 |
| 2026-09-21 12:00 |
15:22:02.33 |
-27:36:21.3 |
HIP 75172 |
5.23 |
| 2026-09-22 00:00 |
15:22:17.20 |
-27:36:34.7 |
HIP 75172 |
8.33 |
| 2026-09-22 12:00 |
15:22:32.16 |
-27:36:48.6 |
HIP 75172 |
11.57 |
| 2026-09-23 00:00 |
15:22:47.22 |
-27:37:03.0 |
HIP 75172 |
14.86 |
| 2026-09-23 12:00 |
15:23:02.36 |
-27:37:17.8 |
HIP 75172 |
18.19 |
| 2026-09-24 00:00 |
15:23:17.59 |
-27:37:33.2 |
HIP 75343 |
20.40 |
| 2026-09-24 12:00 |
15:23:32.92 |
-27:37:48.9 |
HIP 75343 |
19.45 |
| 2026-09-25 00:00 |
15:23:48.33 |
-27:38:05.1 |
HIP 75343 |
19.05 |
| 2026-09-25 12:00 |
15:24:03.83 |
-27:38:21.8 |
HIP 75343 |
19.25 |
| 2026-09-26 00:00 |
15:24:19.41 |
-27:38:38.9 |
HIP 75343 |
20.06 |
| 2026-09-26 12:00 |
15:24:35.09 |
-27:38:56.5 |
HIP 75343 |
21.40 |
| 2026-09-27 00:00 |
15:24:50.85 |
-27:39:14.5 |
HIP 75343 |
23.20 |
| 2026-09-27 12:00 |
15:25:06.69 |
-27:39:32.9 |
HIP 75343 |
25.36 |
| 2026-09-28 00:00 |
15:25:22.62 |
-27:39:51.8 |
HIP 75605 |
26.61 |
| 2026-09-28 12:00 |
15:25:38.64 |
-27:40:11.1 |
HIP 75605 |
23.94 |
| 2026-09-29 00:00 |
15:25:54.73 |
-27:40:30.8 |
HIP 75605 |
21.51 |
| 2026-09-29 12:00 |
15:26:10.91 |
-27:40:51.0 |
HIP 75605 |
19.43 |
| 2026-09-30 00:00 |
15:26:27.18 |
-27:41:11.5 |
HIP 75605 |
17.82 |
| 2026-09-30 12:00 |
15:26:43.52 |
-27:41:32.5 |
HIP 75605 |
16.84 |
| 2026-10-01 00:00 |
15:26:59.95 |
-27:41:53.9 |
HIP 75721 |
16.33 |
| 2026-10-01 12:00 |
15:27:16.46 |
-27:42:15.7 |
HIP 75721 |
12.97 |
| 2026-10-02 00:00 |
15:27:33.04 |
-27:42:37.9 |
HIP 75721 |
9.82 |
| 2026-10-02 12:00 |
15:27:49.71 |
-27:43:00.6 |
HIP 75721 |
7.21 |
| 2026-10-03 00:00 |
15:28:06.46 |
-27:43:23.6 |
HIP 75721 |
5.91 |
| 2026-10-03 12:00 |
15:28:23.28 |
-27:43:47.0 |
HIP 75721 |
6.78 |
| 2026-10-04 00:00 |
15:28:40.18 |
-27:44:10.8 |
HIP 75821 |
9.11 |
| 2026-10-04 12:00 |
15:28:57.16 |
-27:44:35.0 |
HIP 75821 |
5.67 |
| 2026-10-05 00:00 |
15:29:14.22 |
-27:44:59.6 |
HIP 75821 |
3.15 |
| 2026-10-05 12:00 |
15:29:31.35 |
-27:45:24.6 |
HIP 75821 |
4.08 |
| 2026-10-06 00:00 |
15:29:48.56 |
-27:45:50.0 |
HIP 75821 |
7.26 |
| 2026-10-06 12:00 |
15:30:05.84 |
-27:46:15.7 |
HIP 75821 |
10.89 |
| 2026-10-07 00:00 |
15:30:23.19 |
-27:46:41.8 |
HIP 75821 |
14.65 |
| 2026-10-07 12:00 |
15:30:40.62 |
-27:47:08.3 |
HIP 75821 |
18.46 |
| 2026-10-08 00:00 |
15:30:58.12 |
-27:47:35.2 |
HIP 75821 |
22.32 |
| 2026-10-08 12:00 |
15:31:15.70 |
-27:48:02.4 |
HIP 76068 |
24.75 |
| 2026-10-09 00:00 |
15:31:33.34 |
-27:48:30.0 |
HIP 76068 |
22.77 |
| 2026-10-09 12:00 |
15:31:51.06 |
-27:48:57.9 |
HIP 76068 |
21.32 |
| 2026-10-10 00:00 |
15:32:08.84 |
-27:49:26.2 |
HIP 76068 |
20.54 |
| 2026-10-10 12:00 |
15:32:26.69 |
-27:49:54.8 |
HIP 76068 |
20.50 |
| 2026-10-11 00:00 |
15:32:44.62 |
-27:50:23.8 |
HIP 76068 |
21.21 |