メタデータ
| 項目 |
値 |
| Designation |
C/2022 F2 (NEOWISE) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2022-03-23T11:03:25.447680Z |
| Orbit solution date (soln_date, UTC) |
2022-08-26T23:42:58Z |
| Obs used |
108 |
| NEO |
- |
| M1 |
15.800 |
| K1 |
4.500 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2022-03-30T17:17:39.840000Z |
| Discovery magnitude (MPC) |
17.00 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) |
2022-04-15.0000000 |
| e |
0.93379045 |
| q (au) |
1.585007 |
| a (au) |
23.939247 |
| i (deg) |
97.293167 |
| Ω (om, deg) |
58.694002 |
| ω (w, deg) |
200.628782 |
| M (ma, deg) |
0.189661 |
等級
散乱 + 全体線形
$$
M_a = (16.560 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
16.560 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.848 |
| 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 |
04:09:20.55 |
+06:08:50.6 |
HIP 19411 |
34.71 |
| 2026-06-01 12:00 |
04:09:28.79 |
+06:09:28.0 |
HIP 19411 |
34.05 |
| 2026-06-02 00:00 |
04:09:37.03 |
+06:10:05.1 |
HIP 19411 |
33.51 |
| 2026-06-02 12:00 |
04:09:45.25 |
+06:10:41.9 |
HIP 19411 |
33.12 |
| 2026-06-03 00:00 |
04:09:53.47 |
+06:11:18.4 |
HIP 19411 |
32.86 |
| 2026-06-03 12:00 |
04:10:01.67 |
+06:11:54.5 |
HIP 19411 |
32.74 |
| 2026-06-04 00:00 |
04:10:09.86 |
+06:12:30.3 |
HIP 19411 |
32.77 |
| 2026-06-04 12:00 |
04:10:18.04 |
+06:13:05.8 |
HIP 19538 |
32.29 |
| 2026-06-05 00:00 |
04:10:26.21 |
+06:13:41.0 |
HIP 19538 |
31.04 |
| 2026-06-05 12:00 |
04:10:34.36 |
+06:14:15.9 |
HIP 19538 |
29.90 |
| 2026-06-06 00:00 |
04:10:42.50 |
+06:14:50.4 |
HIP 19538 |
28.87 |
| 2026-06-06 12:00 |
04:10:50.63 |
+06:15:24.5 |
HIP 19538 |
27.96 |
| 2026-06-07 00:00 |
04:10:58.74 |
+06:15:58.4 |
HIP 19538 |
27.20 |
| 2026-06-07 12:00 |
04:11:06.84 |
+06:16:31.9 |
HIP 19538 |
26.58 |
| 2026-06-08 00:00 |
04:11:14.92 |
+06:17:05.1 |
HIP 19538 |
26.12 |
| 2026-06-08 12:00 |
04:11:22.99 |
+06:17:38.0 |
HIP 19538 |
25.83 |
| 2026-06-09 00:00 |
04:11:31.04 |
+06:18:10.5 |
HIP 19538 |
25.71 |
| 2026-06-09 12:00 |
04:11:39.08 |
+06:18:42.7 |
HIP 19538 |
25.75 |
| 2026-06-10 00:00 |
04:11:47.10 |
+06:19:14.6 |
HIP 19538 |
25.97 |
| 2026-06-10 12:00 |
04:11:55.10 |
+06:19:46.1 |
HIP 19701 |
25.30 |
| 2026-06-11 00:00 |
04:12:03.08 |
+06:20:17.3 |
HIP 19701 |
23.46 |
| 2026-06-11 12:00 |
04:12:11.04 |
+06:20:48.2 |
HIP 19701 |
21.67 |
| 2026-06-12 00:00 |
04:12:18.99 |
+06:21:18.7 |
HIP 19701 |
19.94 |
| 2026-06-12 12:00 |
04:12:26.91 |
+06:21:48.9 |
HIP 19701 |
18.27 |
| 2026-06-13 00:00 |
04:12:34.81 |
+06:22:18.7 |
HIP 19701 |
16.70 |
| 2026-06-13 12:00 |
04:12:42.70 |
+06:22:48.2 |
HIP 19701 |
15.23 |
| 2026-06-14 00:00 |
04:12:50.56 |
+06:23:17.4 |
HIP 19701 |
13.92 |
| 2026-06-14 12:00 |
04:12:58.40 |
+06:23:46.2 |
HIP 19701 |
12.80 |
| 2026-06-15 00:00 |
04:13:06.22 |
+06:24:14.7 |
HIP 19701 |
11.91 |
| 2026-06-15 12:00 |
04:13:14.01 |
+06:24:42.9 |
HIP 19701 |
11.32 |
| 2026-06-16 00:00 |
04:13:21.79 |
+06:25:10.7 |
HIP 19701 |
11.07 |
| 2026-06-16 12:00 |
04:13:29.53 |
+06:25:38.2 |
HIP 19701 |
11.17 |
| 2026-06-17 00:00 |
04:13:37.26 |
+06:26:05.3 |
HIP 19701 |
11.62 |
| 2026-06-17 12:00 |
04:13:44.95 |
+06:26:32.1 |
HIP 19701 |
12.36 |
| 2026-06-18 00:00 |
04:13:52.63 |
+06:26:58.5 |
HIP 19701 |
13.36 |
| 2026-06-18 12:00 |
04:14:00.27 |
+06:27:24.6 |
HIP 19701 |
14.55 |
| 2026-06-19 00:00 |
04:14:07.89 |
+06:27:50.4 |
HIP 19701 |
15.89 |
| 2026-06-19 12:00 |
04:14:15.49 |
+06:28:15.8 |
HIP 19701 |
17.34 |
| 2026-06-20 00:00 |
04:14:23.05 |
+06:28:40.9 |
HIP 19701 |
18.87 |
| 2026-06-20 12:00 |
04:14:30.59 |
+06:29:05.6 |
HIP 19701 |
20.46 |
| 2026-06-21 00:00 |
04:14:38.10 |
+06:29:30.0 |
HIP 19855 |
21.15 |
| 2026-06-21 12:00 |
04:14:45.58 |
+06:29:54.1 |
HIP 19855 |
20.51 |
| 2026-06-22 00:00 |
04:14:53.03 |
+06:30:17.8 |
HIP 19855 |
20.04 |