C/2019 G2 (PANSTARRS)
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) |
| 2026-02-03 00:00 |
23:37:40.53 |
-16:02:05.3 |
HIP 116468 |
29.09 |
| 2026-02-03 12:00 |
23:37:44.88 |
-16:01:27.9 |
HIP 116468 |
30.31 |
| 2026-02-04 00:00 |
23:37:49.27 |
-16:00:50.4 |
HIP 116468 |
31.54 |
| 2026-02-04 12:00 |
23:37:53.69 |
-16:00:12.8 |
HIP 116468 |
32.77 |
| 2026-02-05 00:00 |
23:37:58.14 |
-15:59:35.3 |
HIP 116468 |
34.01 |
| 2026-02-05 12:00 |
23:38:02.62 |
-15:58:57.7 |
HIP 116468 |
35.25 |
| 2026-02-06 00:00 |
23:38:07.13 |
-15:58:20.1 |
HIP 116468 |
36.50 |
| 2026-02-06 12:00 |
23:38:11.67 |
-15:57:42.4 |
HIP 116468 |
37.76 |
| 2026-02-07 00:00 |
23:38:16.24 |
-15:57:04.8 |
HIP 116468 |
39.03 |
| 2026-02-07 12:00 |
23:38:20.84 |
-15:56:27.2 |
HIP 116468 |
40.30 |
| 2026-02-08 00:00 |
23:38:25.47 |
-15:55:49.5 |
HIP 116792 |
40.18 |
| 2026-02-08 12:00 |
23:38:30.12 |
-15:55:11.9 |
HIP 116792 |
38.98 |
| 2026-02-09 00:00 |
23:38:34.81 |
-15:54:34.2 |
HIP 116792 |
37.78 |
| 2026-02-09 12:00 |
23:38:39.52 |
-15:53:56.5 |
HIP 116792 |
36.58 |
| 2026-02-10 00:00 |
23:38:44.26 |
-15:53:18.9 |
HIP 116792 |
35.38 |
| 2026-02-10 12:00 |
23:38:49.03 |
-15:52:41.2 |
HIP 116792 |
34.19 |
| 2026-02-11 00:00 |
23:38:53.83 |
-15:52:03.6 |
HIP 116792 |
33.00 |
| 2026-02-11 12:00 |
23:38:58.65 |
-15:51:26.0 |
HIP 116792 |
31.82 |
| 2026-02-12 00:00 |
23:39:03.49 |
-15:50:48.3 |
HIP 116792 |
30.65 |
| 2026-02-12 12:00 |
23:39:08.37 |
-15:50:10.7 |
HIP 116792 |
29.48 |
| 2026-02-13 00:00 |
23:39:13.26 |
-15:49:33.2 |
HIP 116792 |
28.33 |
| 2026-02-13 12:00 |
23:39:18.19 |
-15:48:55.6 |
HIP 116792 |
27.19 |
| 2026-02-14 00:00 |
23:39:23.13 |
-15:48:18.1 |
HIP 116792 |
26.07 |
| 2026-02-14 12:00 |
23:39:28.10 |
-15:47:40.6 |
HIP 116792 |
24.97 |
| 2026-02-15 00:00 |
23:39:33.10 |
-15:47:03.2 |
HIP 116792 |
23.89 |
| 2026-02-15 12:00 |
23:39:38.11 |
-15:46:25.8 |
HIP 116792 |
22.85 |
| 2026-02-16 00:00 |
23:39:43.15 |
-15:45:48.4 |
HIP 116792 |
21.83 |
| 2026-02-16 12:00 |
23:39:48.21 |
-15:45:11.1 |
HIP 116792 |
20.85 |
| 2026-02-17 00:00 |
23:39:53.30 |
-15:44:33.8 |
HIP 116792 |
19.92 |
| 2026-02-17 12:00 |
23:39:58.40 |
-15:43:56.5 |
HIP 116792 |
19.04 |
| 2026-02-18 00:00 |
23:40:03.52 |
-15:43:19.4 |
HIP 116792 |
18.22 |
| 2026-02-18 12:00 |
23:40:08.67 |
-15:42:42.2 |
HIP 116792 |
17.48 |
| 2026-02-19 00:00 |
23:40:13.84 |
-15:42:05.2 |
HIP 116792 |
16.82 |
| 2026-02-19 12:00 |
23:40:19.02 |
-15:41:28.2 |
HIP 116792 |
16.25 |
| 2026-02-20 00:00 |
23:40:24.22 |
-15:40:51.2 |
HIP 116792 |
15.78 |
| 2026-02-20 12:00 |
23:40:29.45 |
-15:40:14.4 |
HIP 116792 |
15.43 |
| 2026-02-21 00:00 |
23:40:34.69 |
-15:39:37.6 |
HIP 116792 |
15.21 |
| 2026-02-21 12:00 |
23:40:39.95 |
-15:39:00.9 |
HIP 116792 |
15.11 |
| 2026-02-22 00:00 |
23:40:45.22 |
-15:38:24.2 |
HIP 116792 |
15.15 |
| 2026-02-22 12:00 |
23:40:50.51 |
-15:37:47.7 |
HIP 116792 |
15.32 |
| 2026-02-23 00:00 |
23:40:55.82 |
-15:37:11.2 |
HIP 116792 |
15.62 |
| 2026-02-23 12:00 |
23:41:01.15 |
-15:36:34.8 |
HIP 116792 |
16.05 |
| 2026-02-24 00:00 |
23:41:06.49 |
-15:35:58.5 |
HIP 116922 |
14.89 |