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) |
| 2026-05-12 00:00 |
23:53:49.97 |
-14:45:11.3 |
HIP 117949 |
24.88 |
| 2026-05-12 12:00 |
23:53:53.07 |
-14:45:15.7 |
HIP 117949 |
24.13 |
| 2026-05-13 00:00 |
23:53:56.13 |
-14:45:20.5 |
HIP 117949 |
23.39 |
| 2026-05-13 12:00 |
23:53:59.14 |
-14:45:25.7 |
HIP 117949 |
22.66 |
| 2026-05-14 00:00 |
23:54:02.12 |
-14:45:31.3 |
HIP 117949 |
21.94 |
| 2026-05-14 12:00 |
23:54:05.05 |
-14:45:37.3 |
HIP 117949 |
21.23 |
| 2026-05-15 00:00 |
23:54:07.94 |
-14:45:43.6 |
HIP 117949 |
20.53 |
| 2026-05-15 12:00 |
23:54:10.79 |
-14:45:50.3 |
HIP 117949 |
19.83 |
| 2026-05-16 00:00 |
23:54:13.60 |
-14:45:57.5 |
HIP 117949 |
19.14 |
| 2026-05-16 12:00 |
23:54:16.36 |
-14:46:05.0 |
HIP 117949 |
18.47 |
| 2026-05-17 00:00 |
23:54:19.08 |
-14:46:12.9 |
HIP 117949 |
17.80 |
| 2026-05-17 12:00 |
23:54:21.76 |
-14:46:21.2 |
HIP 117949 |
17.14 |
| 2026-05-18 00:00 |
23:54:24.39 |
-14:46:29.8 |
HIP 117949 |
16.48 |
| 2026-05-18 12:00 |
23:54:26.98 |
-14:46:38.9 |
HIP 117949 |
15.84 |
| 2026-05-19 00:00 |
23:54:29.52 |
-14:46:48.4 |
HIP 117949 |
15.20 |
| 2026-05-19 12:00 |
23:54:32.02 |
-14:46:58.2 |
HIP 117949 |
14.58 |
| 2026-05-20 00:00 |
23:54:34.48 |
-14:47:08.4 |
HIP 117949 |
13.96 |
| 2026-05-20 12:00 |
23:54:36.89 |
-14:47:19.1 |
HIP 117949 |
13.35 |
| 2026-05-21 00:00 |
23:54:39.25 |
-14:47:30.1 |
HIP 117949 |
12.75 |
| 2026-05-21 12:00 |
23:54:41.57 |
-14:47:41.5 |
HIP 117949 |
12.16 |
| 2026-05-22 00:00 |
23:54:43.85 |
-14:47:53.3 |
HIP 117949 |
11.58 |
| 2026-05-22 12:00 |
23:54:46.08 |
-14:48:05.5 |
HIP 117949 |
11.01 |
| 2026-05-23 00:00 |
23:54:48.26 |
-14:48:18.0 |
HIP 117949 |
10.45 |
| 2026-05-23 12:00 |
23:54:50.40 |
-14:48:31.0 |
HIP 117949 |
9.90 |
| 2026-05-24 00:00 |
23:54:52.48 |
-14:48:44.3 |
HIP 117949 |
9.35 |
| 2026-05-24 12:00 |
23:54:54.53 |
-14:48:58.1 |
HIP 117949 |
8.82 |
| 2026-05-25 00:00 |
23:54:56.52 |
-14:49:12.2 |
HIP 117949 |
8.31 |
| 2026-05-25 12:00 |
23:54:58.47 |
-14:49:26.7 |
HIP 117949 |
7.80 |
| 2026-05-26 00:00 |
23:55:00.38 |
-14:49:41.6 |
HIP 117949 |
7.31 |
| 2026-05-26 12:00 |
23:55:02.23 |
-14:49:56.9 |
HIP 117949 |
6.83 |
| 2026-05-27 00:00 |
23:55:04.04 |
-14:50:12.5 |
HIP 117949 |
6.37 |
| 2026-05-27 12:00 |
23:55:05.80 |
-14:50:28.6 |
HIP 117949 |
5.93 |
| 2026-05-28 00:00 |
23:55:07.51 |
-14:50:45.0 |
HIP 117949 |
5.51 |
| 2026-05-28 12:00 |
23:55:09.17 |
-14:51:01.9 |
HIP 117949 |
5.12 |
| 2026-05-29 00:00 |
23:55:10.79 |
-14:51:19.1 |
HIP 117949 |
4.76 |
| 2026-05-29 12:00 |
23:55:12.36 |
-14:51:36.7 |
HIP 117949 |
4.43 |
| 2026-05-30 00:00 |
23:55:13.88 |
-14:51:54.6 |
HIP 117949 |
4.15 |
| 2026-05-30 12:00 |
23:55:15.35 |
-14:52:13.0 |
HIP 117949 |
3.92 |
| 2026-05-31 00:00 |
23:55:16.77 |
-14:52:31.8 |
HIP 117949 |
3.75 |
| 2026-05-31 12:00 |
23:55:18.14 |
-14:52:50.9 |
HIP 117949 |
3.64 |
| 2026-06-01 00:00 |
23:55:19.46 |
-14:53:10.4 |
HIP 117949 |
3.60 |
| 2026-06-01 12:00 |
23:55:20.74 |
-14:53:30.3 |
HIP 117949 |
3.63 |
| 2026-06-02 00:00 |
23:55:21.96 |
-14:53:50.6 |
HIP 117949 |
3.73 |