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) |
| 2026-07-29 00:00 |
04:22:12.23 |
+06:43:57.9 |
HIP 20356 |
17.30 |
| 2026-07-29 12:00 |
04:22:16.24 |
+06:43:56.8 |
HIP 20356 |
17.88 |
| 2026-07-30 00:00 |
04:22:20.19 |
+06:43:55.3 |
HIP 20356 |
18.49 |
| 2026-07-30 12:00 |
04:22:24.07 |
+06:43:53.6 |
HIP 20356 |
19.12 |
| 2026-07-31 00:00 |
04:22:27.90 |
+06:43:51.5 |
HIP 20356 |
19.77 |
| 2026-07-31 12:00 |
04:22:31.66 |
+06:43:49.1 |
HIP 20356 |
20.44 |
| 2026-08-01 00:00 |
04:22:35.36 |
+06:43:46.4 |
HIP 20356 |
21.13 |
| 2026-08-01 12:00 |
04:22:38.99 |
+06:43:43.4 |
HIP 20356 |
21.82 |
| 2026-08-02 00:00 |
04:22:42.56 |
+06:43:40.1 |
HIP 20356 |
22.51 |
| 2026-08-02 12:00 |
04:22:46.07 |
+06:43:36.5 |
HIP 20356 |
23.22 |
| 2026-08-03 00:00 |
04:22:49.51 |
+06:43:32.7 |
HIP 20356 |
23.92 |
| 2026-08-03 12:00 |
04:22:52.89 |
+06:43:28.5 |
HIP 20515 |
24.55 |
| 2026-08-04 00:00 |
04:22:56.21 |
+06:43:24.0 |
HIP 20515 |
24.05 |
| 2026-08-04 12:00 |
04:22:59.46 |
+06:43:19.2 |
HIP 20515 |
23.58 |
| 2026-08-05 00:00 |
04:23:02.64 |
+06:43:14.1 |
HIP 20515 |
23.13 |
| 2026-08-05 12:00 |
04:23:05.76 |
+06:43:08.7 |
HIP 20515 |
22.70 |
| 2026-08-06 00:00 |
04:23:08.81 |
+06:43:03.1 |
HIP 20515 |
22.29 |
| 2026-08-06 12:00 |
04:23:11.80 |
+06:42:57.1 |
HIP 20515 |
21.91 |
| 2026-08-07 00:00 |
04:23:14.72 |
+06:42:50.8 |
HIP 20515 |
21.54 |
| 2026-08-07 12:00 |
04:23:17.57 |
+06:42:44.3 |
HIP 20515 |
21.19 |
| 2026-08-08 00:00 |
04:23:20.35 |
+06:42:37.5 |
HIP 20515 |
20.87 |
| 2026-08-08 12:00 |
04:23:23.06 |
+06:42:30.3 |
HIP 20515 |
20.56 |
| 2026-08-09 00:00 |
04:23:25.71 |
+06:42:22.9 |
HIP 20515 |
20.27 |
| 2026-08-09 12:00 |
04:23:28.29 |
+06:42:15.2 |
HIP 20515 |
20.00 |
| 2026-08-10 00:00 |
04:23:30.79 |
+06:42:07.2 |
HIP 20515 |
19.74 |
| 2026-08-10 12:00 |
04:23:33.23 |
+06:41:59.0 |
HIP 20515 |
19.50 |
| 2026-08-11 00:00 |
04:23:35.60 |
+06:41:50.4 |
HIP 20515 |
19.27 |
| 2026-08-11 12:00 |
04:23:37.90 |
+06:41:41.6 |
HIP 20515 |
19.06 |
| 2026-08-12 00:00 |
04:23:40.13 |
+06:41:32.5 |
HIP 20515 |
18.86 |
| 2026-08-12 12:00 |
04:23:42.28 |
+06:41:23.1 |
HIP 20515 |
18.67 |
| 2026-08-13 00:00 |
04:23:44.37 |
+06:41:13.4 |
HIP 20515 |
18.49 |
| 2026-08-13 12:00 |
04:23:46.38 |
+06:41:03.5 |
HIP 20515 |
18.32 |
| 2026-08-14 00:00 |
04:23:48.32 |
+06:40:53.3 |
HIP 20515 |
18.16 |
| 2026-08-14 12:00 |
04:23:50.19 |
+06:40:42.8 |
HIP 20515 |
18.01 |
| 2026-08-15 00:00 |
04:23:51.99 |
+06:40:32.1 |
HIP 20515 |
17.86 |
| 2026-08-15 12:00 |
04:23:53.71 |
+06:40:21.1 |
HIP 20515 |
17.72 |
| 2026-08-16 00:00 |
04:23:55.36 |
+06:40:09.8 |
HIP 20515 |
17.59 |
| 2026-08-16 12:00 |
04:23:56.94 |
+06:39:58.2 |
HIP 20515 |
17.45 |
| 2026-08-17 00:00 |
04:23:58.44 |
+06:39:46.5 |
HIP 20515 |
17.32 |
| 2026-08-17 12:00 |
04:23:59.87 |
+06:39:34.4 |
HIP 20515 |
17.20 |
| 2026-08-18 00:00 |
04:24:01.23 |
+06:39:22.1 |
HIP 20515 |
17.07 |
| 2026-08-18 12:00 |
04:24:02.51 |
+06:39:09.5 |
HIP 20515 |
16.94 |
| 2026-08-19 00:00 |
04:24:03.72 |
+06:38:56.7 |
HIP 20515 |
16.81 |