C/2019 L2 (NEOWISE)
メタデータ
| 項目 |
値 |
| Designation |
C/2019 L2 (NEOWISE) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2019-04-02T01:58:42.522240Z |
| Orbit solution date (soln_date, UTC) |
2022-07-19T02:26:14Z |
| Obs used |
117 |
| NEO |
- |
| M1 |
10.400 |
| K1 |
27.750 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2019-06-11T18:48:21.312000Z |
| Discovery magnitude (MPC) |
18.00 R |
| Discovery observatory (MPC) |
C51 · WISE |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2019-07-05.0000000 |
| e |
0.93676409 |
| q (au) |
1.621540 |
| a (au) |
25.642708 |
| i (deg) |
152.187378 |
| Ω (om, deg) |
12.534296 |
| ω (w, deg) |
18.816880 |
| M (ma, deg) |
0.712861 |
等級
散乱 + 全体線形
$$
M_a = (13.141 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
13.141 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.500 |
| 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) |
| 2026-02-03 00:00 |
13:40:10.22 |
-05:02:47.8 |
HIP 66706 |
12.49 |
| 2026-02-03 12:00 |
13:40:07.48 |
-05:02:27.9 |
HIP 66706 |
13.03 |
| 2026-02-04 00:00 |
13:40:04.68 |
-05:02:07.6 |
HIP 66706 |
13.59 |
| 2026-02-04 12:00 |
13:40:01.82 |
-05:01:47.1 |
HIP 66706 |
14.19 |
| 2026-02-05 00:00 |
13:39:58.91 |
-05:01:26.2 |
HIP 66706 |
14.81 |
| 2026-02-05 12:00 |
13:39:55.94 |
-05:01:05.0 |
HIP 66706 |
15.46 |
| 2026-02-06 00:00 |
13:39:52.92 |
-05:00:43.5 |
HIP 66706 |
16.14 |
| 2026-02-06 12:00 |
13:39:49.83 |
-05:00:21.7 |
HIP 66706 |
16.85 |
| 2026-02-07 00:00 |
13:39:46.69 |
-04:59:59.6 |
HIP 66706 |
17.58 |
| 2026-02-07 12:00 |
13:39:43.50 |
-04:59:37.3 |
HIP 66706 |
18.33 |
| 2026-02-08 00:00 |
13:39:40.24 |
-04:59:14.6 |
HIP 66706 |
19.11 |
| 2026-02-08 12:00 |
13:39:36.93 |
-04:58:51.6 |
HIP 66706 |
19.90 |
| 2026-02-09 00:00 |
13:39:33.56 |
-04:58:28.3 |
HIP 66706 |
20.72 |
| 2026-02-09 12:00 |
13:39:30.14 |
-04:58:04.7 |
HIP 66706 |
21.57 |
| 2026-02-10 00:00 |
13:39:26.66 |
-04:57:40.9 |
HIP 66706 |
22.43 |
| 2026-02-10 12:00 |
13:39:23.12 |
-04:57:16.7 |
HIP 66706 |
23.31 |
| 2026-02-11 00:00 |
13:39:19.53 |
-04:56:52.2 |
HIP 66706 |
24.21 |
| 2026-02-11 12:00 |
13:39:15.89 |
-04:56:27.5 |
HIP 66706 |
25.13 |
| 2026-02-12 00:00 |
13:39:12.18 |
-04:56:02.5 |
HIP 66706 |
26.07 |
| 2026-02-12 12:00 |
13:39:08.43 |
-04:55:37.2 |
HIP 66706 |
27.03 |
| 2026-02-13 00:00 |
13:39:04.61 |
-04:55:11.6 |
HIP 66450 |
26.41 |
| 2026-02-13 12:00 |
13:39:00.74 |
-04:54:45.7 |
HIP 66450 |
25.37 |
| 2026-02-14 00:00 |
13:38:56.82 |
-04:54:19.5 |
HIP 66450 |
24.32 |
| 2026-02-14 12:00 |
13:38:52.84 |
-04:53:53.1 |
HIP 66450 |
23.25 |
| 2026-02-15 00:00 |
13:38:48.81 |
-04:53:26.4 |
HIP 66450 |
22.17 |
| 2026-02-15 12:00 |
13:38:44.73 |
-04:52:59.4 |
HIP 66450 |
21.07 |
| 2026-02-16 00:00 |
13:38:40.59 |
-04:52:32.2 |
HIP 66450 |
19.97 |
| 2026-02-16 12:00 |
13:38:36.39 |
-04:52:04.6 |
HIP 66450 |
18.85 |
| 2026-02-17 00:00 |
13:38:32.15 |
-04:51:36.9 |
HIP 66450 |
17.72 |
| 2026-02-17 12:00 |
13:38:27.85 |
-04:51:08.8 |
HIP 66450 |
16.58 |
| 2026-02-18 00:00 |
13:38:23.50 |
-04:50:40.5 |
HIP 66450 |
15.43 |
| 2026-02-18 12:00 |
13:38:19.09 |
-04:50:11.9 |
HIP 66450 |
14.28 |
| 2026-02-19 00:00 |
13:38:14.64 |
-04:49:43.1 |
HIP 66450 |
13.12 |
| 2026-02-19 12:00 |
13:38:10.13 |
-04:49:14.0 |
HIP 66450 |
11.95 |
| 2026-02-20 00:00 |
13:38:05.57 |
-04:48:44.7 |
HIP 66450 |
10.79 |
| 2026-02-20 12:00 |
13:38:00.96 |
-04:48:15.1 |
HIP 66450 |
9.63 |
| 2026-02-21 00:00 |
13:37:56.30 |
-04:47:45.3 |
HIP 66450 |
8.48 |
| 2026-02-21 12:00 |
13:37:51.59 |
-04:47:15.2 |
HIP 66450 |
7.36 |
| 2026-02-22 00:00 |
13:37:46.82 |
-04:46:44.9 |
HIP 66450 |
6.29 |
| 2026-02-22 12:00 |
13:37:42.01 |
-04:46:14.4 |
HIP 66450 |
5.30 |
| 2026-02-23 00:00 |
13:37:37.15 |
-04:45:43.6 |
HIP 66450 |
4.47 |
| 2026-02-23 12:00 |
13:37:32.24 |
-04:45:12.6 |
HIP 66450 |
3.91 |
| 2026-02-24 00:00 |
13:37:27.28 |
-04:44:41.3 |
HIP 66450 |
3.76 |