C/2022 F2 (NEOWISE)
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) |
| 2026-02-03 00:00 |
03:50:56.33 |
+02:08:07.1 |
HIP 18022 |
24.69 |
| 2026-02-03 12:00 |
03:50:53.18 |
+02:09:08.6 |
HIP 18022 |
25.78 |
| 2026-02-04 00:00 |
03:50:50.12 |
+02:10:10.3 |
HIP 18022 |
26.89 |
| 2026-02-04 12:00 |
03:50:47.16 |
+02:11:12.2 |
HIP 17867 |
27.90 |
| 2026-02-05 00:00 |
03:50:44.28 |
+02:12:14.5 |
HIP 17867 |
26.68 |
| 2026-02-05 12:00 |
03:50:41.50 |
+02:13:16.9 |
HIP 17867 |
25.47 |
| 2026-02-06 00:00 |
03:50:38.81 |
+02:14:19.7 |
HIP 17867 |
24.28 |
| 2026-02-06 12:00 |
03:50:36.21 |
+02:15:22.6 |
HIP 17867 |
23.12 |
| 2026-02-07 00:00 |
03:50:33.71 |
+02:16:25.8 |
HIP 17867 |
21.98 |
| 2026-02-07 12:00 |
03:50:31.29 |
+02:17:29.3 |
HIP 17867 |
20.86 |
| 2026-02-08 00:00 |
03:50:28.97 |
+02:18:33.0 |
HIP 17867 |
19.77 |
| 2026-02-08 12:00 |
03:50:26.74 |
+02:19:36.9 |
HIP 17867 |
18.71 |
| 2026-02-09 00:00 |
03:50:24.60 |
+02:20:41.0 |
HIP 17867 |
17.69 |
| 2026-02-09 12:00 |
03:50:22.55 |
+02:21:45.4 |
HIP 17867 |
16.71 |
| 2026-02-10 00:00 |
03:50:20.60 |
+02:22:50.0 |
HIP 17867 |
15.78 |
| 2026-02-10 12:00 |
03:50:18.73 |
+02:23:54.8 |
HIP 17867 |
14.91 |
| 2026-02-11 00:00 |
03:50:16.96 |
+02:24:59.8 |
HIP 17867 |
14.09 |
| 2026-02-11 12:00 |
03:50:15.28 |
+02:26:05.0 |
HIP 17867 |
13.36 |
| 2026-02-12 00:00 |
03:50:13.69 |
+02:27:10.4 |
HIP 17867 |
12.70 |
| 2026-02-12 12:00 |
03:50:12.19 |
+02:28:16.0 |
HIP 17867 |
12.15 |
| 2026-02-13 00:00 |
03:50:10.77 |
+02:29:21.8 |
HIP 17867 |
11.71 |
| 2026-02-13 12:00 |
03:50:09.46 |
+02:30:27.8 |
HIP 17867 |
11.39 |
| 2026-02-14 00:00 |
03:50:08.23 |
+02:31:34.0 |
HIP 17867 |
11.20 |
| 2026-02-14 12:00 |
03:50:07.09 |
+02:32:40.4 |
HIP 17867 |
11.15 |
| 2026-02-15 00:00 |
03:50:06.04 |
+02:33:46.9 |
HIP 17867 |
11.24 |
| 2026-02-15 12:00 |
03:50:05.08 |
+02:34:53.6 |
HIP 17867 |
11.46 |
| 2026-02-16 00:00 |
03:50:04.21 |
+02:36:00.5 |
HIP 17867 |
11.81 |
| 2026-02-16 12:00 |
03:50:03.43 |
+02:37:07.6 |
HIP 17867 |
12.28 |
| 2026-02-17 00:00 |
03:50:02.74 |
+02:38:14.8 |
HIP 17867 |
12.84 |
| 2026-02-17 12:00 |
03:50:02.13 |
+02:39:22.2 |
HIP 17867 |
13.50 |
| 2026-02-18 00:00 |
03:50:01.62 |
+02:40:29.8 |
HIP 17867 |
14.23 |
| 2026-02-18 12:00 |
03:50:01.20 |
+02:41:37.4 |
HIP 17867 |
15.03 |
| 2026-02-19 00:00 |
03:50:00.86 |
+02:42:45.3 |
HIP 17867 |
15.89 |
| 2026-02-19 12:00 |
03:50:00.61 |
+02:43:53.3 |
HIP 17867 |
16.79 |
| 2026-02-20 00:00 |
03:50:00.45 |
+02:45:01.4 |
HIP 17867 |
17.73 |
| 2026-02-20 12:00 |
03:50:00.38 |
+02:46:09.6 |
HIP 17867 |
18.71 |
| 2026-02-21 00:00 |
03:50:00.39 |
+02:47:18.0 |
HIP 17867 |
19.71 |
| 2026-02-21 12:00 |
03:50:00.49 |
+02:48:26.5 |
HIP 17867 |
20.74 |
| 2026-02-22 00:00 |
03:50:00.68 |
+02:49:35.1 |
HIP 17867 |
21.79 |
| 2026-02-22 12:00 |
03:50:00.95 |
+02:50:43.8 |
HIP 17927 |
22.00 |
| 2026-02-23 00:00 |
03:50:01.31 |
+02:51:52.7 |
HIP 17927 |
20.86 |
| 2026-02-23 12:00 |
03:50:01.75 |
+02:53:01.6 |
HIP 17927 |
19.70 |
| 2026-02-24 00:00 |
03:50:02.28 |
+02:54:10.7 |
HIP 17927 |
18.55 |