C/2020 Y3 (ATLAS)
メタデータ
| 項目 |
値 |
| Designation |
C/2020 Y3 (ATLAS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2020-12-03T11:39:47.134080Z |
| Orbit solution date (soln_date, UTC) |
2021-09-04T23:43:08Z |
| Obs used |
380 |
| NEO |
- |
| M1 |
13.900 |
| K1 |
8.750 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2020-12-28T15:19:02.899200Z |
| Discovery magnitude (MPC) |
18.49 o |
| Discovery observatory (MPC) |
T08 · ATLAS-MLO, Mauna Loa |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2021-02-25.0000000 |
| e |
0.98676697 |
| q (au) |
1.999243 |
| a (au) |
151.079720 |
| i (deg) |
83.097062 |
| Ω (om, deg) |
191.426774 |
| ω (w, deg) |
342.043610 |
| M (ma, deg) |
0.044326 |
等級
散乱 + 全体線形
$$
M_a = (13.627 + 3.107\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
13.627 |
| n |
3.107 |
| gf |
0.999 |
| gb |
-0.500 |
| k |
0.974 |
| δ90 |
9.994 |
| 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 |
21:40:10.29 |
+48:33:33.9 |
HIP 107076 |
17.40 |
| 2026-02-03 12:00 |
21:40:22.70 |
+48:33:28.0 |
HIP 107076 |
16.10 |
| 2026-02-04 00:00 |
21:40:35.12 |
+48:33:22.9 |
HIP 107076 |
14.99 |
| 2026-02-04 12:00 |
21:40:47.55 |
+48:33:18.7 |
HIP 107076 |
14.10 |
| 2026-02-05 00:00 |
21:40:59.97 |
+48:33:15.3 |
HIP 107076 |
13.49 |
| 2026-02-05 12:00 |
21:41:12.40 |
+48:33:12.8 |
HIP 107076 |
13.19 |
| 2026-02-06 00:00 |
21:41:24.83 |
+48:33:11.1 |
HIP 107076 |
13.22 |
| 2026-02-06 12:00 |
21:41:37.26 |
+48:33:10.2 |
HIP 107076 |
13.58 |
| 2026-02-07 00:00 |
21:41:49.69 |
+48:33:10.2 |
HIP 107076 |
14.24 |
| 2026-02-07 12:00 |
21:42:02.13 |
+48:33:11.0 |
HIP 107076 |
15.17 |
| 2026-02-08 00:00 |
21:42:14.56 |
+48:33:12.7 |
HIP 107076 |
16.32 |
| 2026-02-08 12:00 |
21:42:26.99 |
+48:33:15.1 |
HIP 107076 |
17.65 |
| 2026-02-09 00:00 |
21:42:39.41 |
+48:33:18.4 |
HIP 107076 |
19.12 |
| 2026-02-09 12:00 |
21:42:51.84 |
+48:33:22.6 |
HIP 107076 |
20.70 |
| 2026-02-10 00:00 |
21:43:04.26 |
+48:33:27.5 |
HIP 107076 |
22.36 |
| 2026-02-10 12:00 |
21:43:16.68 |
+48:33:33.3 |
HIP 107076 |
24.10 |
| 2026-02-11 00:00 |
21:43:29.10 |
+48:33:39.9 |
HIP 107076 |
25.88 |
| 2026-02-11 12:00 |
21:43:41.51 |
+48:33:47.4 |
HIP 107076 |
27.72 |
| 2026-02-12 00:00 |
21:43:53.91 |
+48:33:55.6 |
HIP 107519 |
26.43 |
| 2026-02-12 12:00 |
21:44:06.31 |
+48:34:04.7 |
HIP 107519 |
24.38 |
| 2026-02-13 00:00 |
21:44:18.70 |
+48:34:14.6 |
HIP 107519 |
22.33 |
| 2026-02-13 12:00 |
21:44:31.09 |
+48:34:25.3 |
HIP 107519 |
20.28 |
| 2026-02-14 00:00 |
21:44:43.46 |
+48:34:36.8 |
HIP 107519 |
18.22 |
| 2026-02-14 12:00 |
21:44:55.83 |
+48:34:49.1 |
HIP 107519 |
16.17 |
| 2026-02-15 00:00 |
21:45:08.19 |
+48:35:02.3 |
HIP 107519 |
14.12 |
| 2026-02-15 12:00 |
21:45:20.54 |
+48:35:16.2 |
HIP 107519 |
12.07 |
| 2026-02-16 00:00 |
21:45:32.88 |
+48:35:30.9 |
HIP 107519 |
10.02 |
| 2026-02-16 12:00 |
21:45:45.21 |
+48:35:46.5 |
HIP 107519 |
7.97 |
| 2026-02-17 00:00 |
21:45:57.52 |
+48:36:02.8 |
HIP 107519 |
5.93 |
| 2026-02-17 12:00 |
21:46:09.82 |
+48:36:20.0 |
HIP 107519 |
3.89 |
| 2026-02-18 00:00 |
21:46:22.11 |
+48:36:37.9 |
HIP 107519 |
1.90 |
| 2026-02-18 12:00 |
21:46:34.39 |
+48:36:56.6 |
HIP 107519 |
0.66 |
| 2026-02-19 00:00 |
21:46:46.65 |
+48:37:16.1 |
HIP 107519 |
2.38 |
| 2026-02-19 12:00 |
21:46:58.90 |
+48:37:36.4 |
HIP 107519 |
4.40 |
| 2026-02-20 00:00 |
21:47:11.13 |
+48:37:57.5 |
HIP 107519 |
6.43 |
| 2026-02-20 12:00 |
21:47:23.35 |
+48:38:19.4 |
HIP 107519 |
8.47 |
| 2026-02-21 00:00 |
21:47:35.55 |
+48:38:42.0 |
HIP 107519 |
10.52 |
| 2026-02-21 12:00 |
21:47:47.73 |
+48:39:05.4 |
HIP 107519 |
12.56 |
| 2026-02-22 00:00 |
21:47:59.89 |
+48:39:29.6 |
HIP 107519 |
14.61 |
| 2026-02-22 12:00 |
21:48:12.03 |
+48:39:54.5 |
HIP 107519 |
16.65 |
| 2026-02-23 00:00 |
21:48:24.16 |
+48:40:20.2 |
HIP 107713 |
16.16 |
| 2026-02-23 12:00 |
21:48:36.26 |
+48:40:46.7 |
HIP 107713 |
15.69 |
| 2026-02-24 00:00 |
21:48:48.35 |
+48:41:13.9 |
HIP 107713 |
15.49 |