メタデータ
| 項目 |
値 |
| Designation |
P/2019 X1 (Pruyne) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2019-07-22T09:51:42.183360Z |
| Orbit solution date (soln_date, UTC) |
2021-05-31T22:43:04Z |
| Obs used |
137 |
| NEO |
- |
| M1 |
10.500 |
| K1 |
10.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2019-12-02T08:46:47.712000Z |
| Discovery magnitude (MPC) |
19.40 G |
| Discovery observatory (MPC) |
G96 · Mt. Lemmon Survey |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2019-05-31.0000000 |
| e |
0.30260697 |
| q (au) |
4.305513 |
| a (au) |
6.173725 |
| i (deg) |
10.246545 |
| Ω (om, deg) |
43.727710 |
| ω (w, deg) |
36.929270 |
| M (ma, deg) |
356.632521 |
等級
散乱 + 全体線形
$$
M_a = (16.132 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
16.132 |
| n |
2.000 |
| gf |
0.969 |
| gb |
-0.701 |
| k |
0.800 |
| δ90 |
9.739 |
| 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 |
16:46:50.07 |
-26:43:19.9 |
HIP 82157 |
3.13 |
| 2026-03-26 12:00 |
16:46:48.69 |
-26:43:45.2 |
HIP 82157 |
3.57 |
| 2026-03-27 00:00 |
16:46:47.16 |
-26:44:10.3 |
HIP 82157 |
4.06 |
| 2026-03-27 12:00 |
16:46:45.49 |
-26:44:35.1 |
HIP 82157 |
4.59 |
| 2026-03-28 00:00 |
16:46:43.68 |
-26:44:59.6 |
HIP 82157 |
5.14 |
| 2026-03-28 12:00 |
16:46:41.73 |
-26:45:24.0 |
HIP 82157 |
5.73 |
| 2026-03-29 00:00 |
16:46:39.64 |
-26:45:48.0 |
HIP 82157 |
6.34 |
| 2026-03-29 12:00 |
16:46:37.41 |
-26:46:11.8 |
HIP 82157 |
6.97 |
| 2026-03-30 00:00 |
16:46:35.03 |
-26:46:35.4 |
HIP 82157 |
7.63 |
| 2026-03-30 12:00 |
16:46:32.52 |
-26:46:58.7 |
HIP 82157 |
8.31 |
| 2026-03-31 00:00 |
16:46:29.87 |
-26:47:21.8 |
HIP 82157 |
9.02 |
| 2026-03-31 12:00 |
16:46:27.07 |
-26:47:44.6 |
HIP 82157 |
9.75 |
| 2026-04-01 00:00 |
16:46:24.14 |
-26:48:07.1 |
HIP 82157 |
10.50 |
| 2026-04-01 12:00 |
16:46:21.07 |
-26:48:29.4 |
HIP 82157 |
11.28 |
| 2026-04-02 00:00 |
16:46:17.86 |
-26:48:51.5 |
HIP 82069 |
11.87 |
| 2026-04-02 12:00 |
16:46:14.51 |
-26:49:13.2 |
HIP 82069 |
11.79 |
| 2026-04-03 00:00 |
16:46:11.02 |
-26:49:34.7 |
HIP 82069 |
11.75 |
| 2026-04-03 12:00 |
16:46:07.39 |
-26:49:55.9 |
HIP 82069 |
11.76 |
| 2026-04-04 00:00 |
16:46:03.63 |
-26:50:16.9 |
HIP 82069 |
11.82 |
| 2026-04-04 12:00 |
16:45:59.73 |
-26:50:37.6 |
HIP 82069 |
11.93 |
| 2026-04-05 00:00 |
16:45:55.69 |
-26:50:58.0 |
HIP 82069 |
12.11 |
| 2026-04-05 12:00 |
16:45:51.51 |
-26:51:18.1 |
HIP 82069 |
12.36 |
| 2026-04-06 00:00 |
16:45:47.20 |
-26:51:38.0 |
HIP 82069 |
12.68 |
| 2026-04-06 12:00 |
16:45:42.75 |
-26:51:57.6 |
HIP 82069 |
13.06 |
| 2026-04-07 00:00 |
16:45:38.17 |
-26:52:16.9 |
HIP 82069 |
13.52 |
| 2026-04-07 12:00 |
16:45:33.45 |
-26:52:35.9 |
HIP 82069 |
14.04 |
| 2026-04-08 00:00 |
16:45:28.59 |
-26:52:54.6 |
HIP 82069 |
14.64 |
| 2026-04-08 12:00 |
16:45:23.60 |
-26:53:13.1 |
HIP 82069 |
15.30 |
| 2026-04-09 00:00 |
16:45:18.47 |
-26:53:31.3 |
HIP 82069 |
16.03 |
| 2026-04-09 12:00 |
16:45:13.21 |
-26:53:49.1 |
HIP 82069 |
16.81 |
| 2026-04-10 00:00 |
16:45:07.82 |
-26:54:06.7 |
HIP 82069 |
17.66 |
| 2026-04-10 12:00 |
16:45:02.30 |
-26:54:24.0 |
HIP 81910 |
16.86 |
| 2026-04-11 00:00 |
16:44:56.64 |
-26:54:41.0 |
HIP 81910 |
15.79 |
| 2026-04-11 12:00 |
16:44:50.85 |
-26:54:57.7 |
HIP 81910 |
14.73 |
| 2026-04-12 00:00 |
16:44:44.93 |
-26:55:14.1 |
HIP 81910 |
13.69 |
| 2026-04-12 12:00 |
16:44:38.87 |
-26:55:30.2 |
HIP 81910 |
12.67 |
| 2026-04-13 00:00 |
16:44:32.69 |
-26:55:46.0 |
HIP 81910 |
11.71 |
| 2026-04-13 12:00 |
16:44:26.38 |
-26:56:01.5 |
HIP 81910 |
10.82 |
| 2026-04-14 00:00 |
16:44:19.94 |
-26:56:16.7 |
HIP 81910 |
10.03 |
| 2026-04-14 12:00 |
16:44:13.37 |
-26:56:31.6 |
HIP 81910 |
9.38 |
| 2026-04-15 00:00 |
16:44:06.67 |
-26:56:46.2 |
HIP 81910 |
8.92 |
| 2026-04-15 12:00 |
16:43:59.85 |
-26:57:00.5 |
HIP 81910 |
8.69 |
| 2026-04-16 00:00 |
16:43:52.90 |
-26:57:14.4 |
HIP 81910 |
8.72 |