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) |
| 2026-09-20 00:00 |
07:12:44.17 |
+20:43:16.8 |
HIP 34845 |
14.83 |
| 2026-09-20 12:00 |
07:13:53.88 |
+20:37:24.6 |
HIP 35011 |
11.37 |
| 2026-09-21 00:00 |
07:15:03.44 |
+20:31:29.4 |
HIP 35011 |
6.90 |
| 2026-09-21 12:00 |
07:16:12.88 |
+20:25:31.2 |
HIP 35011 |
23.79 |
| 2026-09-22 00:00 |
07:17:22.17 |
+20:19:30.0 |
HIP 35280 |
25.19 |
| 2026-09-22 12:00 |
07:18:31.32 |
+20:13:25.9 |
HIP 35510 |
23.14 |
| 2026-09-23 00:00 |
07:19:40.33 |
+20:07:18.7 |
HIP 35573 |
11.76 |
| 2026-09-23 12:00 |
07:20:49.20 |
+20:01:08.7 |
HIP 35573 |
7.27 |
| 2026-09-24 00:00 |
07:21:57.92 |
+19:54:55.6 |
HIP 35573 |
23.80 |
| 2026-09-24 12:00 |
07:23:06.50 |
+19:48:39.6 |
HIP 35969 |
26.80 |
| 2026-09-25 00:00 |
07:24:14.93 |
+19:42:20.7 |
HIP 35969 |
19.50 |
| 2026-09-25 12:00 |
07:25:23.20 |
+19:35:58.8 |
HIP 36135 |
25.06 |
| 2026-09-26 00:00 |
07:26:31.33 |
+19:29:34.0 |
HIP 36135 |
11.42 |
| 2026-09-26 12:00 |
07:27:39.31 |
+19:23:06.3 |
HIP 36135 |
15.16 |
| 2026-09-27 00:00 |
07:28:47.13 |
+19:16:35.7 |
HIP 36249 |
19.25 |
| 2026-09-27 12:00 |
07:29:54.80 |
+19:10:02.2 |
HIP 36491 |
14.71 |
| 2026-09-28 00:00 |
07:31:02.31 |
+19:03:25.8 |
HIP 36491 |
9.71 |
| 2026-09-28 12:00 |
07:32:09.67 |
+18:56:46.5 |
HIP 36491 |
23.82 |
| 2026-09-29 00:00 |
07:33:16.86 |
+18:50:04.3 |
HIP 36831 |
16.88 |
| 2026-09-29 12:00 |
07:34:23.89 |
+18:43:19.2 |
HIP 36831 |
5.85 |
| 2026-09-30 00:00 |
07:35:30.76 |
+18:36:31.3 |
HIP 36831 |
19.45 |
| 2026-09-30 12:00 |
07:36:37.46 |
+18:29:40.6 |
HIP 37009 |
19.01 |
| 2026-10-01 00:00 |
07:37:44.00 |
+18:22:47.0 |
HIP 37009 |
22.27 |
| 2026-10-01 12:00 |
07:38:50.37 |
+18:15:50.6 |
HIP 37160 |
26.96 |
| 2026-10-02 00:00 |
07:39:56.56 |
+18:08:51.4 |
HIP 37472 |
22.90 |
| 2026-10-02 12:00 |
07:41:02.58 |
+18:01:49.4 |
HIP 37486 |
9.62 |
| 2026-10-03 00:00 |
07:42:08.43 |
+17:54:44.5 |
HIP 37491 |
10.38 |
| 2026-10-03 12:00 |
07:43:14.10 |
+17:47:37.0 |
HIP 37591 |
22.94 |
| 2026-10-04 00:00 |
07:44:19.60 |
+17:40:26.6 |
HIP 37759 |
12.51 |
| 2026-10-04 12:00 |
07:45:24.91 |
+17:33:13.5 |
HIP 37759 |
12.30 |
| 2026-10-05 00:00 |
07:46:30.03 |
+17:25:57.6 |
HIP 38009 |
17.98 |
| 2026-10-05 12:00 |
07:47:34.98 |
+17:18:39.1 |
HIP 38009 |
5.90 |
| 2026-10-06 00:00 |
07:48:39.73 |
+17:11:17.8 |
HIP 38009 |
18.24 |
| 2026-10-06 12:00 |
07:49:44.30 |
+17:03:53.8 |
HIP 38281 |
16.59 |
| 2026-10-07 00:00 |
07:50:48.67 |
+16:56:27.1 |
HIP 38281 |
4.81 |
| 2026-10-07 12:00 |
07:51:52.86 |
+16:48:57.8 |
HIP 38281 |
18.83 |
| 2026-10-08 00:00 |
07:52:56.84 |
+16:41:25.8 |
HIP 38533 |
11.65 |
| 2026-10-08 12:00 |
07:54:00.63 |
+16:33:51.2 |
HIP 38533 |
18.83 |
| 2026-10-09 00:00 |
07:55:04.22 |
+16:26:14.0 |
HIP 38578 |
28.89 |
| 2026-10-09 12:00 |
07:56:07.61 |
+16:18:34.1 |
HIP 38852 |
31.95 |
| 2026-10-10 00:00 |
07:57:10.80 |
+16:10:51.7 |
HIP 38852 |
21.40 |
| 2026-10-10 12:00 |
07:58:13.78 |
+16:03:06.7 |
HIP 38852 |
21.73 |
| 2026-10-11 00:00 |
07:59:16.56 |
+15:55:19.1 |
HIP 39120 |
13.87 |