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) |
| 2026-03-26 00:00 |
18:23:40.71 |
-54:42:24.2 |
HIP 90136 |
6.68 |
| 2026-03-26 12:00 |
18:23:46.09 |
-54:44:32.6 |
HIP 90136 |
4.63 |
| 2026-03-27 00:00 |
18:23:51.30 |
-54:46:41.3 |
HIP 90136 |
2.91 |
| 2026-03-27 12:00 |
18:23:56.31 |
-54:48:50.1 |
HIP 90136 |
2.39 |
| 2026-03-28 00:00 |
18:24:01.15 |
-54:50:59.1 |
HIP 90136 |
3.62 |
| 2026-03-28 12:00 |
18:24:05.79 |
-54:53:08.3 |
HIP 90136 |
5.52 |
| 2026-03-29 00:00 |
18:24:10.25 |
-54:55:17.8 |
HIP 90231 |
4.63 |
| 2026-03-29 12:00 |
18:24:14.52 |
-54:57:27.4 |
HIP 90231 |
3.49 |
| 2026-03-30 00:00 |
18:24:18.60 |
-54:59:37.1 |
HIP 90231 |
3.64 |
| 2026-03-30 12:00 |
18:24:22.49 |
-55:01:47.1 |
HIP 90193 |
1.89 |
| 2026-03-31 00:00 |
18:24:26.19 |
-55:03:57.2 |
HIP 90193 |
1.77 |
| 2026-03-31 12:00 |
18:24:29.71 |
-55:06:07.4 |
HIP 90243 |
2.55 |
| 2026-04-01 00:00 |
18:24:33.03 |
-55:08:17.8 |
HIP 90243 |
3.31 |
| 2026-04-01 12:00 |
18:24:36.15 |
-55:10:28.4 |
HIP 90243 |
5.04 |
| 2026-04-02 00:00 |
18:24:39.09 |
-55:12:39.1 |
HIP 90243 |
7.06 |
| 2026-04-02 12:00 |
18:24:41.83 |
-55:14:49.9 |
HIP 90243 |
9.18 |
| 2026-04-03 00:00 |
18:24:44.38 |
-55:17:00.8 |
HIP 90243 |
11.34 |
| 2026-04-03 12:00 |
18:24:46.73 |
-55:19:11.8 |
HIP 90243 |
13.51 |
| 2026-04-04 00:00 |
18:24:48.89 |
-55:21:23.0 |
HIP 90243 |
15.70 |
| 2026-04-04 12:00 |
18:24:50.85 |
-55:23:34.3 |
HIP 90243 |
17.89 |
| 2026-04-05 00:00 |
18:24:52.62 |
-55:25:45.6 |
HIP 90243 |
20.09 |
| 2026-04-05 12:00 |
18:24:54.19 |
-55:27:57.0 |
HIP 90243 |
22.29 |
| 2026-04-06 00:00 |
18:24:55.56 |
-55:30:08.6 |
HIP 90026 |
23.74 |
| 2026-04-06 12:00 |
18:24:56.73 |
-55:32:20.1 |
HIP 90026 |
23.65 |
| 2026-04-07 00:00 |
18:24:57.70 |
-55:34:31.8 |
HIP 90028 |
23.70 |
| 2026-04-07 12:00 |
18:24:58.47 |
-55:36:43.5 |
HIP 90028 |
23.91 |
| 2026-04-08 00:00 |
18:24:59.04 |
-55:38:55.2 |
HIP 90028 |
24.30 |
| 2026-04-08 12:00 |
18:24:59.41 |
-55:41:07.0 |
HIP 90028 |
24.84 |
| 2026-04-09 00:00 |
18:24:59.58 |
-55:43:18.8 |
HIP 90446 |
23.87 |
| 2026-04-09 12:00 |
18:24:59.54 |
-55:45:30.7 |
HIP 90446 |
22.65 |
| 2026-04-10 00:00 |
18:24:59.30 |
-55:47:42.5 |
HIP 90446 |
21.61 |
| 2026-04-10 12:00 |
18:24:58.86 |
-55:49:54.4 |
HIP 90446 |
20.79 |
| 2026-04-11 00:00 |
18:24:58.22 |
-55:52:06.2 |
HIP 90308 |
18.93 |
| 2026-04-11 12:00 |
18:24:57.36 |
-55:54:18.1 |
HIP 90308 |
16.85 |
| 2026-04-12 00:00 |
18:24:56.31 |
-55:56:29.9 |
HIP 90308 |
14.82 |
| 2026-04-12 12:00 |
18:24:55.04 |
-55:58:41.7 |
HIP 90308 |
12.86 |
| 2026-04-13 00:00 |
18:24:53.57 |
-56:00:53.4 |
HIP 90308 |
11.01 |
| 2026-04-13 12:00 |
18:24:51.90 |
-56:03:05.1 |
HIP 90308 |
9.33 |
| 2026-04-14 00:00 |
18:24:50.01 |
-56:05:16.7 |
HIP 90308 |
7.94 |
| 2026-04-14 12:00 |
18:24:47.92 |
-56:07:28.3 |
HIP 90308 |
7.01 |
| 2026-04-15 00:00 |
18:24:45.62 |
-56:09:39.7 |
HIP 90308 |
6.74 |
| 2026-04-15 12:00 |
18:24:43.11 |
-56:11:51.1 |
HIP 90308 |
7.20 |
| 2026-04-16 00:00 |
18:24:40.39 |
-56:14:02.4 |
HIP 90308 |
8.28 |