メタデータ
| 項目 |
値 |
| Designation |
C/2019 G2 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2019-12-10T01:37:22.817280Z |
| Orbit solution date (soln_date, UTC) |
2024-04-15T15:43:27Z |
| Obs used |
120 |
| NEO |
- |
| M1 |
16.700 |
| K1 |
5.250 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2019-04-02T10:34:13.152000Z |
| Discovery magnitude (MPC) |
21.30 w |
| Discovery observatory (MPC) |
F51 · Pan-STARRS 1, Haleakala |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2019-10-14.0000000 |
| e |
0.99672459 |
| q (au) |
2.291345 |
| a (au) |
699.559136 |
| i (deg) |
159.211459 |
| Ω (om, deg) |
208.142727 |
| ω (w, deg) |
82.653435 |
| M (ma, deg) |
359.996960 |
等級
散乱 + 全体線形
$$
M_a = (14.208 + 4.325\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
14.208 |
| n |
4.325 |
| gf |
1.000 |
| gb |
-0.827 |
| k |
0.995 |
| 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 |
23:46:40.12 |
-15:04:02.1 |
HIP 117222 |
9.90 |
| 2026-03-26 12:00 |
23:46:45.65 |
-15:03:36.2 |
HIP 117222 |
11.29 |
| 2026-03-27 00:00 |
23:46:51.16 |
-15:03:10.4 |
HIP 117222 |
12.69 |
| 2026-03-27 12:00 |
23:46:56.67 |
-15:02:44.9 |
HIP 117222 |
14.08 |
| 2026-03-28 00:00 |
23:47:02.16 |
-15:02:19.7 |
HIP 117222 |
15.46 |
| 2026-03-28 12:00 |
23:47:07.65 |
-15:01:54.7 |
HIP 117222 |
16.85 |
| 2026-03-29 00:00 |
23:47:13.12 |
-15:01:30.0 |
HIP 117222 |
18.23 |
| 2026-03-29 12:00 |
23:47:18.59 |
-15:01:05.5 |
HIP 117222 |
19.61 |
| 2026-03-30 00:00 |
23:47:24.04 |
-15:00:41.2 |
HIP 117425 |
19.52 |
| 2026-03-30 12:00 |
23:47:29.48 |
-15:00:17.3 |
HIP 117425 |
18.18 |
| 2026-03-31 00:00 |
23:47:34.90 |
-14:59:53.6 |
HIP 117425 |
16.84 |
| 2026-03-31 12:00 |
23:47:40.32 |
-14:59:30.1 |
HIP 117425 |
15.51 |
| 2026-04-01 00:00 |
23:47:45.72 |
-14:59:06.9 |
HIP 117425 |
14.20 |
| 2026-04-01 12:00 |
23:47:51.11 |
-14:58:44.0 |
HIP 117425 |
12.90 |
| 2026-04-02 00:00 |
23:47:56.48 |
-14:58:21.4 |
HIP 117425 |
11.62 |
| 2026-04-02 12:00 |
23:48:01.84 |
-14:57:59.0 |
HIP 117425 |
10.37 |
| 2026-04-03 00:00 |
23:48:07.18 |
-14:57:36.9 |
HIP 117425 |
9.15 |
| 2026-04-03 12:00 |
23:48:12.51 |
-14:57:15.0 |
HIP 117425 |
7.97 |
| 2026-04-04 00:00 |
23:48:17.83 |
-14:56:53.5 |
HIP 117425 |
6.85 |
| 2026-04-04 12:00 |
23:48:23.13 |
-14:56:32.2 |
HIP 117425 |
5.83 |
| 2026-04-05 00:00 |
23:48:28.41 |
-14:56:11.2 |
HIP 117425 |
4.97 |
| 2026-04-05 12:00 |
23:48:33.68 |
-14:55:50.5 |
HIP 117425 |
4.35 |
| 2026-04-06 00:00 |
23:48:38.92 |
-14:55:30.0 |
HIP 117425 |
4.08 |
| 2026-04-06 12:00 |
23:48:44.16 |
-14:55:09.9 |
HIP 117425 |
4.23 |
| 2026-04-07 00:00 |
23:48:49.37 |
-14:54:50.0 |
HIP 117425 |
4.75 |
| 2026-04-07 12:00 |
23:48:54.57 |
-14:54:30.4 |
HIP 117425 |
5.53 |
| 2026-04-08 00:00 |
23:48:59.75 |
-14:54:11.1 |
HIP 117425 |
6.47 |
| 2026-04-08 12:00 |
23:49:04.91 |
-14:53:52.1 |
HIP 117425 |
7.52 |
| 2026-04-09 00:00 |
23:49:10.05 |
-14:53:33.4 |
HIP 117425 |
8.63 |
| 2026-04-09 12:00 |
23:49:15.18 |
-14:53:15.0 |
HIP 117425 |
9.78 |
| 2026-04-10 00:00 |
23:49:20.28 |
-14:52:56.9 |
HIP 117425 |
10.95 |
| 2026-04-10 12:00 |
23:49:25.36 |
-14:52:39.0 |
HIP 117425 |
12.14 |
| 2026-04-11 00:00 |
23:49:30.43 |
-14:52:21.5 |
HIP 117425 |
13.33 |
| 2026-04-11 12:00 |
23:49:35.47 |
-14:52:04.3 |
HIP 117558 |
14.40 |
| 2026-04-12 00:00 |
23:49:40.49 |
-14:51:47.4 |
HIP 117558 |
13.50 |
| 2026-04-12 12:00 |
23:49:45.49 |
-14:51:30.8 |
HIP 117558 |
12.66 |
| 2026-04-13 00:00 |
23:49:50.47 |
-14:51:14.5 |
HIP 117558 |
11.89 |
| 2026-04-13 12:00 |
23:49:55.42 |
-14:50:58.5 |
HIP 117558 |
11.20 |
| 2026-04-14 00:00 |
23:50:00.36 |
-14:50:42.9 |
HIP 117558 |
10.61 |
| 2026-04-14 12:00 |
23:50:05.27 |
-14:50:27.5 |
HIP 117558 |
10.13 |
| 2026-04-15 00:00 |
23:50:10.16 |
-14:50:12.5 |
HIP 117558 |
9.78 |
| 2026-04-15 12:00 |
23:50:15.02 |
-14:49:57.8 |
HIP 117558 |
9.56 |
| 2026-04-16 00:00 |
23:50:19.86 |
-14:49:43.4 |
HIP 117558 |
9.49 |