メタデータ
| 項目 |
値 |
| Designation |
P/2022 D1 (PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2021-08-28T02:02:35.586240Z |
| Orbit solution date (soln_date, UTC) |
2022-05-19T21:13:41Z |
| Obs used |
97 |
| NEO |
- |
| M1 |
15.900 |
| K1 |
4.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2022-02-24T13:16:06.585600Z |
| Discovery magnitude (MPC) |
20.71 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) |
2022-03-09.0000000 |
| e |
0.54702589 |
| q (au) |
3.352561 |
| a (au) |
7.401219 |
| i (deg) |
44.064028 |
| Ω (om, deg) |
47.965841 |
| ω (w, deg) |
88.712500 |
| M (ma, deg) |
9.443106 |
等級
散乱 + 全体線形
$$
M_a = (19.752 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
19.752 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
0.800 |
| 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) |
| 2026-05-12 00:00 |
18:17:33.34 |
-58:00:51.6 |
HIP 89652 |
10.40 |
| 2026-05-12 12:00 |
18:17:19.81 |
-58:02:41.4 |
HIP 89652 |
9.14 |
| 2026-05-13 00:00 |
18:17:06.10 |
-58:04:30.4 |
HIP 89652 |
8.51 |
| 2026-05-13 12:00 |
18:16:52.21 |
-58:06:18.7 |
HIP 89652 |
8.65 |
| 2026-05-14 00:00 |
18:16:38.12 |
-58:08:06.2 |
HIP 89469 |
9.37 |
| 2026-05-14 12:00 |
18:16:23.86 |
-58:09:53.0 |
HIP 89469 |
7.11 |
| 2026-05-15 00:00 |
18:16:09.41 |
-58:11:39.0 |
HIP 89469 |
5.14 |
| 2026-05-15 12:00 |
18:15:54.78 |
-58:13:24.2 |
HIP 89469 |
3.96 |
| 2026-05-16 00:00 |
18:15:39.97 |
-58:15:08.6 |
HIP 89469 |
4.28 |
| 2026-05-16 12:00 |
18:15:24.98 |
-58:16:52.2 |
HIP 89469 |
5.87 |
| 2026-05-17 00:00 |
18:15:09.82 |
-58:18:35.0 |
HIP 89469 |
8.02 |
| 2026-05-17 12:00 |
18:14:54.48 |
-58:20:16.9 |
HIP 89469 |
10.39 |
| 2026-05-18 00:00 |
18:14:38.96 |
-58:21:58.0 |
HIP 89469 |
12.86 |
| 2026-05-18 12:00 |
18:14:23.28 |
-58:23:38.2 |
HIP 89469 |
15.39 |
| 2026-05-19 00:00 |
18:14:07.43 |
-58:25:17.5 |
HIP 89375 |
17.14 |
| 2026-05-19 12:00 |
18:13:51.41 |
-58:26:56.0 |
HIP 89219 |
15.79 |
| 2026-05-20 00:00 |
18:13:35.22 |
-58:28:33.5 |
HIP 89219 |
13.15 |
| 2026-05-20 12:00 |
18:13:18.87 |
-58:30:10.2 |
HIP 89219 |
10.52 |
| 2026-05-21 00:00 |
18:13:02.36 |
-58:31:45.9 |
HIP 89219 |
7.92 |
| 2026-05-21 12:00 |
18:12:45.69 |
-58:33:20.7 |
HIP 89219 |
5.41 |
| 2026-05-22 00:00 |
18:12:28.86 |
-58:34:54.5 |
HIP 89219 |
3.21 |
| 2026-05-22 12:00 |
18:12:11.87 |
-58:36:27.4 |
HIP 89219 |
2.45 |
| 2026-05-23 00:00 |
18:11:54.73 |
-58:37:59.3 |
HIP 89219 |
4.05 |
| 2026-05-23 12:00 |
18:11:37.44 |
-58:39:30.3 |
HIP 89219 |
6.45 |
| 2026-05-24 00:00 |
18:11:20.00 |
-58:41:00.3 |
HIP 89219 |
9.04 |
| 2026-05-24 12:00 |
18:11:02.41 |
-58:42:29.3 |
HIP 89219 |
11.70 |
| 2026-05-25 00:00 |
18:10:44.67 |
-58:43:57.3 |
HIP 89219 |
14.39 |
| 2026-05-25 12:00 |
18:10:26.80 |
-58:45:24.2 |
HIP 89024 |
12.91 |
| 2026-05-26 00:00 |
18:10:08.77 |
-58:46:50.2 |
HIP 89024 |
11.26 |
| 2026-05-26 12:00 |
18:09:50.61 |
-58:48:15.1 |
HIP 89024 |
10.12 |
| 2026-05-27 00:00 |
18:09:32.32 |
-58:49:39.0 |
HIP 89024 |
9.67 |
| 2026-05-27 12:00 |
18:09:13.89 |
-58:51:01.9 |
HIP 89024 |
10.01 |
| 2026-05-28 00:00 |
18:08:55.32 |
-58:52:23.6 |
HIP 89024 |
11.06 |
| 2026-05-28 12:00 |
18:08:36.62 |
-58:53:44.4 |
HIP 88775 |
10.41 |
| 2026-05-29 00:00 |
18:08:17.80 |
-58:55:04.0 |
HIP 88775 |
7.66 |
| 2026-05-29 12:00 |
18:07:58.85 |
-58:56:22.6 |
HIP 88775 |
4.93 |
| 2026-05-30 00:00 |
18:07:39.77 |
-58:57:40.0 |
HIP 88775 |
2.29 |
| 2026-05-30 12:00 |
18:07:20.58 |
-58:58:56.4 |
HIP 88775 |
1.25 |
| 2026-05-31 00:00 |
18:07:01.26 |
-59:00:11.7 |
HIP 88775 |
3.66 |
| 2026-05-31 12:00 |
18:06:41.83 |
-59:01:25.8 |
HIP 88775 |
6.38 |
| 2026-06-01 00:00 |
18:06:22.28 |
-59:02:38.8 |
HIP 88775 |
9.14 |
| 2026-06-01 12:00 |
18:06:02.62 |
-59:03:50.7 |
HIP 88775 |
11.92 |
| 2026-06-02 00:00 |
18:05:42.85 |
-59:05:01.5 |
HIP 88531 |
10.78 |