メタデータ
| 項目 |
値 |
| Designation |
P/2019 V2 (Groeller) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2020-10-20T05:08:35.226240Z |
| Orbit solution date (soln_date, UTC) |
2022-06-07T21:45:21Z |
| Obs used |
115 |
| NEO |
- |
| M1 |
9.300 |
| K1 |
11.000 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2019-11-03T12:01:16.032000Z |
| Discovery magnitude (MPC) |
20.70 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) |
2020-07-26.0000000 |
| e |
0.33232040 |
| q (au) |
5.020653 |
| a (au) |
7.519555 |
| i (deg) |
11.801180 |
| Ω (om, deg) |
189.184282 |
| ω (w, deg) |
336.046255 |
| M (ma, deg) |
355.879070 |
等級
散乱 + 全体線形
$$
M_a = (6.254 + 5.539\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
6.254 |
| n |
5.539 |
| gf |
0.999 |
| gb |
-0.761 |
| 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 |
20:03:12.95 |
-09:18:14.7 |
HIP 98808 |
13.50 |
| 2026-03-26 12:00 |
20:03:22.38 |
-09:17:14.9 |
HIP 98808 |
10.98 |
| 2026-03-27 00:00 |
20:03:31.72 |
-09:16:15.3 |
HIP 98808 |
8.49 |
| 2026-03-27 12:00 |
20:03:40.96 |
-09:15:15.7 |
HIP 98808 |
6.03 |
| 2026-03-28 00:00 |
20:03:50.11 |
-09:14:16.2 |
HIP 98808 |
3.64 |
| 2026-03-28 12:00 |
20:03:59.17 |
-09:13:16.8 |
HIP 98808 |
1.52 |
| 2026-03-29 00:00 |
20:04:08.13 |
-09:12:17.5 |
HIP 98808 |
1.80 |
| 2026-03-29 12:00 |
20:04:17.00 |
-09:11:18.3 |
HIP 98808 |
3.96 |
| 2026-03-30 00:00 |
20:04:25.77 |
-09:10:19.2 |
HIP 98808 |
6.28 |
| 2026-03-30 12:00 |
20:04:34.45 |
-09:09:20.2 |
HIP 98808 |
8.60 |
| 2026-03-31 00:00 |
20:04:43.03 |
-09:08:21.4 |
HIP 98804 |
10.60 |
| 2026-03-31 12:00 |
20:04:51.51 |
-09:07:22.6 |
HIP 98804 |
12.67 |
| 2026-04-01 00:00 |
20:04:59.90 |
-09:06:24.0 |
HIP 98804 |
14.79 |
| 2026-04-01 12:00 |
20:05:08.20 |
-09:05:25.5 |
HIP 98804 |
16.93 |
| 2026-04-02 00:00 |
20:05:16.39 |
-09:04:27.2 |
HIP 98804 |
19.07 |
| 2026-04-02 12:00 |
20:05:24.49 |
-09:03:29.0 |
HIP 98804 |
21.21 |
| 2026-04-03 00:00 |
20:05:32.49 |
-09:02:30.9 |
HIP 99085 |
21.96 |
| 2026-04-03 12:00 |
20:05:40.39 |
-09:01:32.9 |
HIP 99085 |
19.80 |
| 2026-04-04 00:00 |
20:05:48.20 |
-09:00:35.1 |
HIP 99085 |
17.66 |
| 2026-04-04 12:00 |
20:05:55.90 |
-08:59:37.5 |
HIP 99085 |
15.55 |
| 2026-04-05 00:00 |
20:06:03.51 |
-08:58:40.0 |
HIP 99085 |
13.48 |
| 2026-04-05 12:00 |
20:06:11.01 |
-08:57:42.6 |
HIP 99085 |
11.44 |
| 2026-04-06 00:00 |
20:06:18.42 |
-08:56:45.5 |
HIP 99085 |
9.44 |
| 2026-04-06 12:00 |
20:06:25.72 |
-08:55:48.4 |
HIP 99085 |
7.50 |
| 2026-04-07 00:00 |
20:06:32.93 |
-08:54:51.6 |
HIP 99085 |
5.66 |
| 2026-04-07 12:00 |
20:06:40.03 |
-08:53:54.9 |
HIP 99085 |
4.02 |
| 2026-04-08 00:00 |
20:06:47.03 |
-08:52:58.4 |
HIP 99085 |
2.88 |
| 2026-04-08 12:00 |
20:06:53.92 |
-08:52:02.1 |
HIP 99085 |
2.86 |
| 2026-04-09 00:00 |
20:07:00.72 |
-08:51:05.9 |
HIP 99085 |
3.94 |
| 2026-04-09 12:00 |
20:07:07.41 |
-08:50:09.9 |
HIP 99085 |
5.49 |
| 2026-04-10 00:00 |
20:07:14.00 |
-08:49:14.2 |
HIP 99085 |
7.19 |
| 2026-04-10 12:00 |
20:07:20.48 |
-08:48:18.6 |
HIP 99085 |
8.94 |
| 2026-04-11 00:00 |
20:07:26.86 |
-08:47:23.2 |
HIP 99085 |
10.70 |
| 2026-04-11 12:00 |
20:07:33.14 |
-08:46:28.1 |
HIP 99085 |
12.46 |
| 2026-04-12 00:00 |
20:07:39.31 |
-08:45:33.1 |
HIP 99085 |
14.21 |
| 2026-04-12 12:00 |
20:07:45.37 |
-08:44:38.4 |
HIP 99085 |
15.94 |
| 2026-04-13 00:00 |
20:07:51.33 |
-08:43:43.8 |
HIP 99085 |
17.65 |
| 2026-04-13 12:00 |
20:07:57.18 |
-08:42:49.5 |
HIP 99085 |
19.35 |
| 2026-04-14 00:00 |
20:08:02.93 |
-08:41:55.4 |
HIP 99085 |
21.02 |
| 2026-04-14 12:00 |
20:08:08.57 |
-08:41:01.6 |
HIP 99085 |
22.67 |
| 2026-04-15 00:00 |
20:08:14.10 |
-08:40:07.9 |
HIP 99085 |
24.30 |
| 2026-04-15 12:00 |
20:08:19.52 |
-08:39:14.6 |
HIP 99311 |
23.05 |
| 2026-04-16 00:00 |
20:08:24.83 |
-08:38:21.4 |
HIP 99311 |
21.48 |