メタデータ
| 項目 |
値 |
| Designation |
P/2019 B2 (Groeller) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2019-06-08T00:39:50.480640Z |
| Orbit solution date (soln_date, UTC) |
2021-05-31T22:43:02Z |
| Obs used |
187 |
| NEO |
- |
| M1 |
7.400 |
| K1 |
25.750 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2019-01-26T07:32:12.192000Z |
| Discovery magnitude (MPC) |
18.00 G |
| Discovery observatory (MPC) |
703 · Catalina Sky Survey |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2019-03-01.0000000 |
| e |
0.37290156 |
| q (au) |
2.416517 |
| a (au) |
3.853490 |
| i (deg) |
16.829150 |
| Ω (om, deg) |
176.459298 |
| ω (w, deg) |
358.709921 |
| M (ma, deg) |
347.097338 |
等級
散乱 + 全体線形
$$
M_a = (10.865 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
10.865 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.503 |
| k |
1.000 |
| 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 |
05:14:56.08 |
+06:58:28.3 |
HIP 24510 |
9.00 |
| 2026-03-26 12:00 |
05:15:22.38 |
+07:01:13.7 |
HIP 24510 |
2.35 |
| 2026-03-27 00:00 |
05:15:48.90 |
+07:03:58.5 |
HIP 24510 |
5.57 |
| 2026-03-27 12:00 |
05:16:15.62 |
+07:06:42.6 |
HIP 24584 |
11.34 |
| 2026-03-28 00:00 |
05:16:42.55 |
+07:09:26.2 |
HIP 24584 |
8.96 |
| 2026-03-28 12:00 |
05:17:09.69 |
+07:12:09.1 |
HIP 24584 |
11.71 |
| 2026-03-29 00:00 |
05:17:37.04 |
+07:14:51.4 |
HIP 24681 |
6.44 |
| 2026-03-29 12:00 |
05:18:04.59 |
+07:17:33.0 |
HIP 24681 |
6.91 |
| 2026-03-30 00:00 |
05:18:32.35 |
+07:20:14.0 |
HIP 24681 |
12.77 |
| 2026-03-30 12:00 |
05:19:00.30 |
+07:22:54.3 |
HIP 24681 |
19.74 |
| 2026-03-31 00:00 |
05:19:28.46 |
+07:25:34.0 |
HIP 25004 |
26.35 |
| 2026-03-31 12:00 |
05:19:56.82 |
+07:28:13.0 |
HIP 25004 |
20.19 |
| 2026-04-01 00:00 |
05:20:25.38 |
+07:30:51.3 |
HIP 25004 |
15.25 |
| 2026-04-01 12:00 |
05:20:54.13 |
+07:33:28.9 |
HIP 25004 |
13.06 |
| 2026-04-02 00:00 |
05:21:23.08 |
+07:36:05.8 |
HIP 25004 |
14.97 |
| 2026-04-02 12:00 |
05:21:52.23 |
+07:38:42.0 |
HIP 25004 |
19.87 |
| 2026-04-03 00:00 |
05:22:21.57 |
+07:41:17.5 |
HIP 25185 |
13.25 |
| 2026-04-03 12:00 |
05:22:51.10 |
+07:43:52.3 |
HIP 25185 |
6.55 |
| 2026-04-04 00:00 |
05:23:20.82 |
+07:46:26.4 |
HIP 25185 |
5.53 |
| 2026-04-04 12:00 |
05:23:50.74 |
+07:48:59.7 |
HIP 25185 |
11.85 |
| 2026-04-05 00:00 |
05:24:20.84 |
+07:51:32.3 |
HIP 25185 |
19.35 |
| 2026-04-05 12:00 |
05:24:51.13 |
+07:54:04.2 |
HIP 25185 |
27.10 |
| 2026-04-06 00:00 |
05:25:21.61 |
+07:56:35.3 |
HIP 25481 |
25.48 |
| 2026-04-06 12:00 |
05:25:52.28 |
+07:59:05.6 |
HIP 25481 |
17.48 |
| 2026-04-07 00:00 |
05:26:23.13 |
+08:01:35.2 |
HIP 25481 |
9.45 |
| 2026-04-07 12:00 |
05:26:54.17 |
+08:04:04.0 |
HIP 25481 |
1.39 |
| 2026-04-08 00:00 |
05:27:25.39 |
+08:06:32.0 |
HIP 25481 |
6.74 |
| 2026-04-08 12:00 |
05:27:56.79 |
+08:08:59.2 |
HIP 25481 |
14.89 |
| 2026-04-09 00:00 |
05:28:28.37 |
+08:11:25.6 |
HIP 25481 |
23.08 |
| 2026-04-09 12:00 |
05:29:00.14 |
+08:13:51.2 |
HIP 25814 |
28.39 |
| 2026-04-10 00:00 |
05:29:32.08 |
+08:16:16.1 |
HIP 25814 |
20.15 |
| 2026-04-10 12:00 |
05:30:04.20 |
+08:18:40.0 |
HIP 25814 |
11.92 |
| 2026-04-11 00:00 |
05:30:36.50 |
+08:21:03.2 |
HIP 25814 |
3.95 |
| 2026-04-11 12:00 |
05:31:08.97 |
+08:23:25.6 |
HIP 25814 |
5.35 |
| 2026-04-12 00:00 |
05:31:41.62 |
+08:25:47.0 |
HIP 25904 |
2.28 |
| 2026-04-12 12:00 |
05:32:14.44 |
+08:28:07.7 |
HIP 25904 |
7.55 |
| 2026-04-13 00:00 |
05:32:47.44 |
+08:30:27.5 |
HIP 26044 |
8.16 |
| 2026-04-13 12:00 |
05:33:20.61 |
+08:32:46.4 |
HIP 26044 |
0.53 |
| 2026-04-14 00:00 |
05:33:53.94 |
+08:35:04.5 |
HIP 26044 |
8.93 |
| 2026-04-14 12:00 |
05:34:27.45 |
+08:37:21.7 |
HIP 26223 |
13.03 |
| 2026-04-15 00:00 |
05:35:01.13 |
+08:39:38.0 |
HIP 26223 |
4.53 |
| 2026-04-15 12:00 |
05:35:34.98 |
+08:41:53.4 |
HIP 26223 |
4.53 |
| 2026-04-16 00:00 |
05:36:08.99 |
+08:44:07.9 |
HIP 26223 |
13.10 |