メタデータ
| 項目 |
値 |
| Designation |
C/2020 F2 (ATLAS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2022-07-15T21:34:18.912000Z |
| Orbit solution date (soln_date, UTC) |
2026-03-07T14:42:52Z |
| Obs used |
1649 |
| NEO |
- |
| M1 |
6.300 |
| K1 |
7.250 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2022-04-08.0000000 |
| e |
1.00484187 |
| q (au) |
8.817057 |
| a (au) |
-1821.002957 |
| i (deg) |
163.583705 |
| Ω (om, deg) |
250.268049 |
| ω (w, deg) |
48.361233 |
| M (ma, deg) |
-0.001254 |
等級
散乱 + 全体線形
$$
M_a = (-1.509 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
-1.509 |
| n |
6.000 |
| gf |
0.831 |
| gb |
-0.928 |
| k |
1.000 |
| δ90 |
1.136 |
| 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
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) |
終了日 (UTC) |
a |
b |
| 2019-05-27 |
2022-07-14 |
+9.9375 |
-9.585 |
| 2022-07-16 |
2026-02-20 |
+11.9466 |
-11.468 |
log10 r = log10(太陽距離/AU)、Δ = 地球距離(AU)
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-20 00:00 |
09:48:58.11 |
+28:18:51.5 |
HIP 48093 |
15.02 |
| 2026-09-20 12:00 |
09:49:02.73 |
+28:18:46.5 |
HIP 48093 |
15.67 |
| 2026-09-21 00:00 |
09:49:07.30 |
+28:18:42.0 |
HIP 48093 |
16.35 |
| 2026-09-21 12:00 |
09:49:11.83 |
+28:18:37.9 |
HIP 48093 |
17.05 |
| 2026-09-22 00:00 |
09:49:16.32 |
+28:18:34.2 |
HIP 48093 |
17.76 |
| 2026-09-22 12:00 |
09:49:20.76 |
+28:18:31.0 |
HIP 48093 |
18.49 |
| 2026-09-23 00:00 |
09:49:25.16 |
+28:18:28.2 |
HIP 48093 |
19.23 |
| 2026-09-23 12:00 |
09:49:29.52 |
+28:18:25.9 |
HIP 48093 |
19.98 |
| 2026-09-24 00:00 |
09:49:33.83 |
+28:18:24.0 |
HIP 48093 |
20.73 |
| 2026-09-24 12:00 |
09:49:38.09 |
+28:18:22.6 |
HIP 48093 |
21.49 |
| 2026-09-25 00:00 |
09:49:42.31 |
+28:18:21.7 |
HIP 48093 |
22.24 |
| 2026-09-25 12:00 |
09:49:46.48 |
+28:18:21.2 |
HIP 48093 |
23.00 |
| 2026-09-26 00:00 |
09:49:50.60 |
+28:18:21.1 |
HIP 48093 |
23.75 |
| 2026-09-26 12:00 |
09:49:54.68 |
+28:18:21.6 |
HIP 48093 |
24.50 |
| 2026-09-27 00:00 |
09:49:58.71 |
+28:18:22.5 |
HIP 48093 |
25.25 |
| 2026-09-27 12:00 |
09:50:02.69 |
+28:18:23.8 |
HIP 48093 |
26.00 |
| 2026-09-28 00:00 |
09:50:06.62 |
+28:18:25.6 |
HIP 48093 |
26.73 |
| 2026-09-28 12:00 |
09:50:10.50 |
+28:18:27.9 |
HIP 48093 |
27.47 |
| 2026-09-29 00:00 |
09:50:14.33 |
+28:18:30.7 |
HIP 48093 |
28.19 |
| 2026-09-29 12:00 |
09:50:18.11 |
+28:18:33.9 |
HIP 48093 |
28.91 |
| 2026-09-30 00:00 |
09:50:21.84 |
+28:18:37.6 |
HIP 48093 |
29.62 |
| 2026-09-30 12:00 |
09:50:25.51 |
+28:18:41.8 |
HIP 48093 |
30.32 |
| 2026-10-01 00:00 |
09:50:29.14 |
+28:18:46.4 |
HIP 48093 |
31.02 |
| 2026-10-01 12:00 |
09:50:32.71 |
+28:18:51.6 |
HIP 48093 |
31.70 |
| 2026-10-02 00:00 |
09:50:36.23 |
+28:18:57.2 |
HIP 48093 |
32.38 |
| 2026-10-02 12:00 |
09:50:39.69 |
+28:19:03.3 |
HIP 48093 |
33.05 |
| 2026-10-03 00:00 |
09:50:43.10 |
+28:19:09.8 |
HIP 48093 |
33.70 |
| 2026-10-03 12:00 |
09:50:46.45 |
+28:19:16.9 |
HIP 48093 |
34.35 |
| 2026-10-04 00:00 |
09:50:49.75 |
+28:19:24.4 |
HIP 48093 |
34.99 |
| 2026-10-04 12:00 |
09:50:52.99 |
+28:19:32.5 |
HIP 48093 |
35.61 |
| 2026-10-05 00:00 |
09:50:56.17 |
+28:19:41.0 |
HIP 48093 |
36.23 |
| 2026-10-05 12:00 |
09:50:59.30 |
+28:19:50.0 |
HIP 48093 |
36.83 |
| 2026-10-06 00:00 |
09:51:02.37 |
+28:19:59.5 |
HIP 48342 |
37.17 |
| 2026-10-06 12:00 |
09:51:05.38 |
+28:20:09.6 |
HIP 48342 |
36.96 |
| 2026-10-07 00:00 |
09:51:08.33 |
+28:20:20.1 |
HIP 48342 |
36.76 |
| 2026-10-07 12:00 |
09:51:11.22 |
+28:20:31.1 |
HIP 48342 |
36.56 |
| 2026-10-08 00:00 |
09:51:14.05 |
+28:20:42.6 |
HIP 48342 |
36.36 |
| 2026-10-08 12:00 |
09:51:16.81 |
+28:20:54.6 |
HIP 48342 |
36.16 |
| 2026-10-09 00:00 |
09:51:19.52 |
+28:21:07.1 |
HIP 48342 |
35.96 |
| 2026-10-09 12:00 |
09:51:22.16 |
+28:21:20.2 |
HIP 48342 |
35.77 |
| 2026-10-10 00:00 |
09:51:24.74 |
+28:21:33.7 |
HIP 48342 |
35.57 |
| 2026-10-10 12:00 |
09:51:27.26 |
+28:21:47.8 |
HIP 48342 |
35.38 |
| 2026-10-11 00:00 |
09:51:29.71 |
+28:22:02.3 |
HIP 48549 |
34.91 |