メタデータ
| 項目 |
値 |
| Designation |
C/2019 H1 (NEOWISE) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2019-04-27T17:40:42.101760Z |
| Orbit solution date (soln_date, UTC) |
2022-06-20T23:12:33Z |
| Obs used |
165 |
| NEO |
- |
| M1 |
16.900 |
| K1 |
4.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2019-04-18T21:12:57.600000Z |
| 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) |
2019-05-16.0000000 |
| e |
0.99219409 |
| q (au) |
1.844784 |
| a (au) |
236.331687 |
| i (deg) |
104.580185 |
| Ω (om, deg) |
269.186008 |
| ω (w, deg) |
19.282675 |
| M (ma, deg) |
0.004955 |
等級
散乱 + 全体線形
$$
M_a = (17.164 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
17.164 |
| n |
2.000 |
| gf |
0.999 |
| gb |
-0.518 |
| k |
0.800 |
| 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) |
| 2026-06-01 00:00 |
06:11:16.95 |
+38:33:24.2 |
HIP 29452 |
18.53 |
| 2026-06-01 12:00 |
06:11:23.74 |
+38:33:05.3 |
HIP 29452 |
17.90 |
| 2026-06-02 00:00 |
06:11:30.53 |
+38:32:46.6 |
HIP 29452 |
17.35 |
| 2026-06-02 12:00 |
06:11:37.35 |
+38:32:28.1 |
HIP 29452 |
16.88 |
| 2026-06-03 00:00 |
06:11:44.19 |
+38:32:09.8 |
HIP 29452 |
16.52 |
| 2026-06-03 12:00 |
06:11:51.04 |
+38:31:51.6 |
HIP 29452 |
16.25 |
| 2026-06-04 00:00 |
06:11:57.91 |
+38:31:33.5 |
HIP 29452 |
16.09 |
| 2026-06-04 12:00 |
06:12:04.80 |
+38:31:15.7 |
HIP 29452 |
16.05 |
| 2026-06-05 00:00 |
06:12:11.70 |
+38:30:58.0 |
HIP 29452 |
16.12 |
| 2026-06-05 12:00 |
06:12:18.62 |
+38:30:40.4 |
HIP 29452 |
16.31 |
| 2026-06-06 00:00 |
06:12:25.56 |
+38:30:23.0 |
HIP 29452 |
16.60 |
| 2026-06-06 12:00 |
06:12:32.51 |
+38:30:05.8 |
HIP 29452 |
17.01 |
| 2026-06-07 00:00 |
06:12:39.48 |
+38:29:48.8 |
HIP 29452 |
17.51 |
| 2026-06-07 12:00 |
06:12:46.46 |
+38:29:31.9 |
HIP 29452 |
18.10 |
| 2026-06-08 00:00 |
06:12:53.45 |
+38:29:15.1 |
HIP 29452 |
18.78 |
| 2026-06-08 12:00 |
06:13:00.46 |
+38:28:58.6 |
HIP 29605 |
19.39 |
| 2026-06-09 00:00 |
06:13:07.48 |
+38:28:42.2 |
HIP 29605 |
18.49 |
| 2026-06-09 12:00 |
06:13:14.51 |
+38:28:25.9 |
HIP 29605 |
17.64 |
| 2026-06-10 00:00 |
06:13:21.56 |
+38:28:09.9 |
HIP 29605 |
16.87 |
| 2026-06-10 12:00 |
06:13:28.62 |
+38:27:53.9 |
HIP 29605 |
16.18 |
| 2026-06-11 00:00 |
06:13:35.69 |
+38:27:38.2 |
HIP 29605 |
15.59 |
| 2026-06-11 12:00 |
06:13:42.77 |
+38:27:22.6 |
HIP 29605 |
15.09 |
| 2026-06-12 00:00 |
06:13:49.86 |
+38:27:07.2 |
HIP 29605 |
14.71 |
| 2026-06-12 12:00 |
06:13:56.96 |
+38:26:52.0 |
HIP 29605 |
14.46 |
| 2026-06-13 00:00 |
06:14:04.07 |
+38:26:36.9 |
HIP 29605 |
14.34 |
| 2026-06-13 12:00 |
06:14:11.19 |
+38:26:21.9 |
HIP 29605 |
14.35 |
| 2026-06-14 00:00 |
06:14:18.32 |
+38:26:07.2 |
HIP 29605 |
14.50 |
| 2026-06-14 12:00 |
06:14:25.45 |
+38:25:52.6 |
HIP 29605 |
14.79 |
| 2026-06-15 00:00 |
06:14:32.60 |
+38:25:38.2 |
HIP 29605 |
15.19 |
| 2026-06-15 12:00 |
06:14:39.75 |
+38:25:23.9 |
HIP 29605 |
15.72 |
| 2026-06-16 00:00 |
06:14:46.91 |
+38:25:09.8 |
HIP 29605 |
16.34 |
| 2026-06-16 12:00 |
06:14:54.07 |
+38:24:55.9 |
HIP 29605 |
17.06 |
| 2026-06-17 00:00 |
06:15:01.24 |
+38:24:42.2 |
HIP 29605 |
17.86 |
| 2026-06-17 12:00 |
06:15:08.42 |
+38:24:28.6 |
HIP 29605 |
18.74 |
| 2026-06-18 00:00 |
06:15:15.60 |
+38:24:15.1 |
HIP 29605 |
19.67 |
| 2026-06-18 12:00 |
06:15:22.78 |
+38:24:01.9 |
HIP 29605 |
20.66 |
| 2026-06-19 00:00 |
06:15:29.97 |
+38:23:48.8 |
HIP 29605 |
21.70 |
| 2026-06-19 12:00 |
06:15:37.16 |
+38:23:35.9 |
HIP 29605 |
22.78 |
| 2026-06-20 00:00 |
06:15:44.35 |
+38:23:23.1 |
HIP 29605 |
23.89 |
| 2026-06-20 12:00 |
06:15:51.55 |
+38:23:10.5 |
HIP 29605 |
25.03 |
| 2026-06-21 00:00 |
06:15:58.74 |
+38:22:58.1 |
HIP 29605 |
26.20 |
| 2026-06-21 12:00 |
06:16:05.94 |
+38:22:45.8 |
HIP 29605 |
27.39 |
| 2026-06-22 00:00 |
06:16:13.14 |
+38:22:33.7 |
HIP 29774 |
28.39 |