メタデータ
| 項目 |
値 |
| Designation |
P/2019 X2 (PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2019-12-09T07:42:50.428800Z |
| Orbit solution date (soln_date, UTC) |
2026-06-09T11:12:42Z |
| Obs used |
53 |
| NEO |
- |
| M1 |
18.100 |
| K1 |
10.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2019-12-04T13:53:07.584000Z |
| Discovery magnitude (MPC) |
21.60 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) |
2019-12-30.0000000 |
| e |
0.49931033 |
| q (au) |
1.824220 |
| a (au) |
3.643415 |
| i (deg) |
15.882899 |
| Ω (om, deg) |
250.859629 |
| ω (w, deg) |
213.561968 |
| M (ma, deg) |
2.930636 |
等級
散乱 + 全体線形
$$
M_a = (20.000 + 3.550\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
20.000 |
| n |
3.550 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
0.936 |
| 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
ファインディングチャート
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
05:02:32.08 |
+26:15:28.2 |
HIP 23349 |
23.32 |
| 2026-07-29 12:00 |
05:03:46.58 |
+26:14:56.0 |
HIP 23523 |
29.14 |
| 2026-07-30 00:00 |
05:05:01.11 |
+26:14:21.1 |
HIP 23712 |
16.38 |
| 2026-07-30 12:00 |
05:06:15.68 |
+26:13:43.4 |
HIP 23712 |
13.07 |
| 2026-07-31 00:00 |
05:07:30.29 |
+26:13:03.0 |
HIP 23884 |
8.76 |
| 2026-07-31 12:00 |
05:08:44.94 |
+26:12:19.8 |
HIP 23884 |
13.25 |
| 2026-08-01 00:00 |
05:09:59.62 |
+26:11:33.9 |
HIP 24136 |
19.82 |
| 2026-08-01 12:00 |
05:11:14.33 |
+26:10:45.2 |
HIP 24136 |
13.54 |
| 2026-08-02 00:00 |
05:12:29.08 |
+26:09:53.7 |
HIP 24252 |
17.49 |
| 2026-08-02 12:00 |
05:13:43.85 |
+26:08:59.4 |
HIP 24431 |
17.53 |
| 2026-08-03 00:00 |
05:14:58.65 |
+26:08:02.3 |
HIP 24431 |
14.39 |
| 2026-08-03 12:00 |
05:16:13.49 |
+26:07:02.4 |
HIP 24654 |
16.08 |
| 2026-08-04 00:00 |
05:17:28.34 |
+26:05:59.7 |
HIP 24654 |
1.32 |
| 2026-08-04 12:00 |
05:18:43.23 |
+26:04:54.2 |
HIP 24655 |
17.43 |
| 2026-08-05 00:00 |
05:19:58.13 |
+26:03:45.8 |
HIP 25089 |
31.99 |
| 2026-08-05 12:00 |
05:21:13.06 |
+26:02:34.6 |
HIP 25089 |
16.66 |
| 2026-08-06 00:00 |
05:22:28.00 |
+26:01:20.5 |
HIP 25089 |
10.08 |
| 2026-08-06 12:00 |
05:23:42.97 |
+26:00:03.5 |
HIP 25089 |
22.27 |
| 2026-08-07 00:00 |
05:24:57.95 |
+25:58:43.7 |
HIP 25400 |
19.44 |
| 2026-08-07 12:00 |
05:26:12.95 |
+25:57:21.0 |
HIP 25400 |
12.03 |
| 2026-08-08 00:00 |
05:27:27.96 |
+25:55:55.3 |
HIP 25556 |
13.01 |
| 2026-08-08 12:00 |
05:28:42.98 |
+25:54:26.8 |
HIP 25556 |
18.91 |
| 2026-08-09 00:00 |
05:29:58.01 |
+25:52:55.4 |
HIP 25792 |
11.13 |
| 2026-08-09 12:00 |
05:31:13.05 |
+25:51:21.0 |
HIP 25792 |
14.77 |
| 2026-08-10 00:00 |
05:32:28.09 |
+25:49:43.7 |
HIP 25792 |
29.80 |
| 2026-08-10 12:00 |
05:33:43.14 |
+25:48:03.5 |
HIP 26177 |
16.09 |
| 2026-08-11 00:00 |
05:34:58.19 |
+25:46:20.3 |
HIP 26225 |
5.47 |
| 2026-08-11 12:00 |
05:36:13.24 |
+25:44:34.1 |
HIP 26330 |
9.90 |
| 2026-08-12 00:00 |
05:37:28.29 |
+25:42:45.0 |
HIP 26330 |
15.43 |
| 2026-08-12 12:00 |
05:38:43.34 |
+25:40:53.0 |
HIP 26640 |
18.85 |
| 2026-08-13 00:00 |
05:39:58.38 |
+25:38:57.9 |
HIP 26640 |
15.20 |
| 2026-08-13 12:00 |
05:41:13.41 |
+25:37:00.0 |
HIP 26818 |
8.46 |
| 2026-08-14 00:00 |
05:42:28.44 |
+25:34:58.9 |
HIP 26818 |
11.91 |
| 2026-08-14 12:00 |
05:43:43.45 |
+25:32:54.9 |
HIP 26998 |
6.62 |
| 2026-08-15 00:00 |
05:44:58.46 |
+25:30:47.9 |
HIP 27173 |
15.23 |
| 2026-08-15 12:00 |
05:46:13.44 |
+25:28:37.9 |
HIP 27236 |
1.57 |
| 2026-08-16 00:00 |
05:47:28.42 |
+25:26:24.8 |
HIP 27353 |
7.83 |
| 2026-08-16 12:00 |
05:48:43.38 |
+25:24:08.8 |
HIP 27478 |
15.81 |
| 2026-08-17 00:00 |
05:49:58.32 |
+25:21:49.7 |
HIP 27640 |
16.63 |
| 2026-08-17 12:00 |
05:51:13.23 |
+25:19:27.6 |
HIP 27640 |
6.22 |
| 2026-08-18 00:00 |
05:52:28.13 |
+25:17:02.5 |
HIP 27847 |
18.91 |
| 2026-08-18 12:00 |
05:53:43.01 |
+25:14:34.3 |
HIP 27847 |
10.56 |
| 2026-08-19 00:00 |
05:54:57.86 |
+25:12:03.1 |
HIP 28084 |
18.65 |