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
$$
M_a = (11.155 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
11.155 |
| 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) |
| 2026-03-26 00:00 |
15:53:23.80 |
-31:47:34.7 |
HIP 77870 |
18.61 |
| 2026-03-26 12:00 |
15:53:17.12 |
-31:47:53.9 |
HIP 77870 |
19.06 |
| 2026-03-27 00:00 |
15:53:10.27 |
-31:48:12.3 |
HIP 77735 |
18.90 |
| 2026-03-27 12:00 |
15:53:03.25 |
-31:48:30.1 |
HIP 77735 |
17.77 |
| 2026-03-28 00:00 |
15:52:56.06 |
-31:48:47.2 |
HIP 77735 |
16.69 |
| 2026-03-28 12:00 |
15:52:48.70 |
-31:49:03.6 |
HIP 77735 |
15.68 |
| 2026-03-29 00:00 |
15:52:41.18 |
-31:49:19.2 |
HIP 77735 |
14.77 |
| 2026-03-29 12:00 |
15:52:33.49 |
-31:49:34.2 |
HIP 77735 |
14.00 |
| 2026-03-30 00:00 |
15:52:25.63 |
-31:49:48.5 |
HIP 77735 |
13.38 |
| 2026-03-30 12:00 |
15:52:17.61 |
-31:50:02.0 |
HIP 77735 |
12.97 |
| 2026-03-31 00:00 |
15:52:09.43 |
-31:50:14.8 |
HIP 77735 |
12.79 |
| 2026-03-31 12:00 |
15:52:01.09 |
-31:50:26.9 |
HIP 77735 |
12.87 |
| 2026-04-01 00:00 |
15:51:52.58 |
-31:50:38.3 |
HIP 77735 |
13.22 |
| 2026-04-01 12:00 |
15:51:43.91 |
-31:50:49.0 |
HIP 77735 |
13.82 |
| 2026-04-02 00:00 |
15:51:35.09 |
-31:50:58.9 |
HIP 77735 |
14.66 |
| 2026-04-02 12:00 |
15:51:26.10 |
-31:51:08.0 |
HIP 77735 |
15.72 |
| 2026-04-03 00:00 |
15:51:16.95 |
-31:51:16.5 |
HIP 77735 |
16.96 |
| 2026-04-03 12:00 |
15:51:07.65 |
-31:51:24.1 |
HIP 77735 |
18.35 |
| 2026-04-04 00:00 |
15:50:58.19 |
-31:51:31.1 |
HIP 77735 |
19.88 |
| 2026-04-04 12:00 |
15:50:48.57 |
-31:51:37.2 |
HIP 77735 |
21.53 |
| 2026-04-05 00:00 |
15:50:38.80 |
-31:51:42.6 |
HIP 77657 |
22.58 |
| 2026-04-05 12:00 |
15:50:28.88 |
-31:51:47.2 |
HIP 77657 |
23.44 |
| 2026-04-06 00:00 |
15:50:18.80 |
-31:51:51.1 |
HIP 77657 |
24.47 |
| 2026-04-06 12:00 |
15:50:08.57 |
-31:51:54.2 |
HIP 77441 |
24.68 |
| 2026-04-07 00:00 |
15:49:58.19 |
-31:51:56.5 |
HIP 77441 |
22.83 |
| 2026-04-07 12:00 |
15:49:47.66 |
-31:51:58.0 |
HIP 77441 |
21.04 |
| 2026-04-08 00:00 |
15:49:36.98 |
-31:51:58.7 |
HIP 77441 |
19.32 |
| 2026-04-08 12:00 |
15:49:26.16 |
-31:51:58.7 |
HIP 77441 |
17.71 |
| 2026-04-09 00:00 |
15:49:15.19 |
-31:51:57.8 |
HIP 77441 |
16.27 |
| 2026-04-09 12:00 |
15:49:04.07 |
-31:51:56.1 |
HIP 77441 |
15.04 |
| 2026-04-10 00:00 |
15:48:52.81 |
-31:51:53.7 |
HIP 77441 |
14.11 |
| 2026-04-10 12:00 |
15:48:41.40 |
-31:51:50.4 |
HIP 77441 |
13.55 |
| 2026-04-11 00:00 |
15:48:29.86 |
-31:51:46.3 |
HIP 77441 |
13.42 |
| 2026-04-11 12:00 |
15:48:18.18 |
-31:51:41.4 |
HIP 77441 |
13.75 |
| 2026-04-12 00:00 |
15:48:06.35 |
-31:51:35.7 |
HIP 77441 |
14.53 |
| 2026-04-12 12:00 |
15:47:54.39 |
-31:51:29.2 |
HIP 77441 |
15.70 |
| 2026-04-13 00:00 |
15:47:42.30 |
-31:51:21.8 |
HIP 77441 |
17.20 |
| 2026-04-13 12:00 |
15:47:30.06 |
-31:51:13.7 |
HIP 77441 |
18.95 |
| 2026-04-14 00:00 |
15:47:17.70 |
-31:51:04.6 |
HIP 77217 |
20.07 |
| 2026-04-14 12:00 |
15:47:05.21 |
-31:50:54.8 |
HIP 77217 |
17.91 |
| 2026-04-15 00:00 |
15:46:52.58 |
-31:50:44.1 |
HIP 77217 |
15.89 |
| 2026-04-15 12:00 |
15:46:39.83 |
-31:50:32.6 |
HIP 77217 |
14.08 |
| 2026-04-16 00:00 |
15:46:26.95 |
-31:50:20.3 |
HIP 77217 |
12.60 |