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 · University of Arizona 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 |
-0.998 |
| 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) |
| 2026-09-20 00:00 |
09:40:05.86 |
+04:43:39.5 |
HIP 47526 |
18.80 |
| 2026-09-20 12:00 |
09:40:55.24 |
+04:40:12.6 |
HIP 47526 |
6.72 |
| 2026-09-21 00:00 |
09:41:44.59 |
+04:36:45.1 |
HIP 47526 |
7.96 |
| 2026-09-21 12:00 |
09:42:33.91 |
+04:33:17.1 |
HIP 47526 |
20.19 |
| 2026-09-22 00:00 |
09:43:23.20 |
+04:29:48.6 |
HIP 47812 |
24.81 |
| 2026-09-22 12:00 |
09:44:12.46 |
+04:26:19.6 |
HIP 47812 |
12.97 |
| 2026-09-23 00:00 |
09:45:01.69 |
+04:22:50.2 |
HIP 47812 |
6.82 |
| 2026-09-23 12:00 |
09:45:50.89 |
+04:19:20.2 |
HIP 47812 |
15.81 |
| 2026-09-24 00:00 |
09:46:40.06 |
+04:15:49.7 |
HIP 48063 |
17.99 |
| 2026-09-24 12:00 |
09:47:29.20 |
+04:12:18.7 |
HIP 48063 |
5.54 |
| 2026-09-25 00:00 |
09:48:18.30 |
+04:08:47.3 |
HIP 48063 |
7.92 |
| 2026-09-25 12:00 |
09:49:07.38 |
+04:05:15.4 |
HIP 48063 |
20.48 |
| 2026-09-26 00:00 |
09:49:56.42 |
+04:01:43.1 |
HIP 48273 |
20.70 |
| 2026-09-26 12:00 |
09:50:45.43 |
+03:58:10.3 |
HIP 48273 |
22.77 |
| 2026-09-27 00:00 |
09:51:34.41 |
+03:54:37.1 |
HIP 48459 |
19.08 |
| 2026-09-27 12:00 |
09:52:23.35 |
+03:51:03.4 |
HIP 48459 |
7.30 |
| 2026-09-28 00:00 |
09:53:12.26 |
+03:47:29.3 |
HIP 48459 |
8.13 |
| 2026-09-28 12:00 |
09:54:01.14 |
+03:43:54.8 |
HIP 48459 |
20.05 |
| 2026-09-29 00:00 |
09:54:49.99 |
+03:40:19.9 |
HIP 48609 |
21.06 |
| 2026-09-29 12:00 |
09:55:38.80 |
+03:36:44.6 |
HIP 48772 |
27.74 |
| 2026-09-30 00:00 |
09:56:27.58 |
+03:33:08.8 |
HIP 48797 |
16.69 |
| 2026-09-30 12:00 |
09:57:16.32 |
+03:29:32.7 |
HIP 48797 |
9.91 |
| 2026-10-01 00:00 |
09:58:05.03 |
+03:25:56.3 |
HIP 48797 |
15.48 |
| 2026-10-01 12:00 |
09:58:53.70 |
+03:22:19.4 |
HIP 48990 |
12.36 |
| 2026-10-02 00:00 |
09:59:42.34 |
+03:18:42.2 |
HIP 48990 |
4.39 |
| 2026-10-02 12:00 |
10:00:30.94 |
+03:15:04.6 |
HIP 48990 |
14.37 |
| 2026-10-03 00:00 |
10:01:19.50 |
+03:11:26.7 |
HIP 48990 |
26.72 |
| 2026-10-03 12:00 |
10:02:08.03 |
+03:07:48.4 |
HIP 49329 |
30.37 |
| 2026-10-04 00:00 |
10:02:56.52 |
+03:04:09.8 |
HIP 49329 |
19.63 |
| 2026-10-04 12:00 |
10:03:44.97 |
+03:00:30.9 |
HIP 49329 |
12.97 |
| 2026-10-05 00:00 |
10:04:33.38 |
+02:56:51.7 |
HIP 49329 |
16.44 |
| 2026-10-05 12:00 |
10:05:21.76 |
+02:53:12.2 |
HIP 49544 |
24.21 |
| 2026-10-06 00:00 |
10:06:10.09 |
+02:49:32.4 |
HIP 49544 |
14.36 |
| 2026-10-06 12:00 |
10:06:58.38 |
+02:45:52.4 |
HIP 49544 |
12.01 |
| 2026-10-07 00:00 |
10:07:46.63 |
+02:42:12.1 |
HIP 49544 |
20.00 |
| 2026-10-07 12:00 |
10:08:34.84 |
+02:38:31.5 |
HIP 49756 |
20.31 |
| 2026-10-08 00:00 |
10:09:23.01 |
+02:34:50.7 |
HIP 49756 |
12.58 |
| 2026-10-08 12:00 |
10:10:11.14 |
+02:31:09.6 |
HIP 49777 |
12.81 |
| 2026-10-09 00:00 |
10:10:59.22 |
+02:27:28.3 |
HIP 49777 |
20.94 |
| 2026-10-09 12:00 |
10:11:47.25 |
+02:23:46.8 |
HIP 49777 |
32.05 |
| 2026-10-10 00:00 |
10:12:35.25 |
+02:20:05.2 |
HIP 50091 |
25.61 |
| 2026-10-10 12:00 |
10:13:23.19 |
+02:16:23.3 |
HIP 50091 |
24.09 |
| 2026-10-11 00:00 |
10:14:11.10 |
+02:12:41.3 |
HIP 50091 |
28.61 |