メタデータ
| 項目 |
値 |
| Designation |
C/2020 N2 (ATLAS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2020-08-23T17:05:24.480960Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:34:09Z |
| Obs used |
88 |
| NEO |
- |
| M1 |
16.600 |
| K1 |
6.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2020-07-13T12:55:53.097600Z |
| Discovery magnitude (MPC) |
18.29 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) |
2020-07-30.0000000 |
| e |
0.98239504 |
| q (au) |
1.793804 |
| a (au) |
101.891955 |
| i (deg) |
161.034349 |
| Ω (om, deg) |
257.076442 |
| ω (w, deg) |
331.226561 |
| M (ma, deg) |
359.976319 |
等級
散乱 + 全体線形
$$
M_a = (17.042 + 3.130\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
17.042 |
| n |
3.130 |
| gf |
0.986 |
| gb |
-0.629 |
| k |
0.891 |
| δ90 |
9.740 |
| 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) |
| 2026-09-20 00:00 |
10:07:02.46 |
+29:07:36.0 |
HIP 49580 |
7.18 |
| 2026-09-20 12:00 |
10:07:07.90 |
+29:07:24.2 |
HIP 49580 |
7.02 |
| 2026-09-21 00:00 |
10:07:13.32 |
+29:07:12.7 |
HIP 49580 |
7.06 |
| 2026-09-21 12:00 |
10:07:18.70 |
+29:07:01.6 |
HIP 49580 |
7.28 |
| 2026-09-22 00:00 |
10:07:24.06 |
+29:06:50.9 |
HIP 49580 |
7.68 |
| 2026-09-22 12:00 |
10:07:29.38 |
+29:06:40.5 |
HIP 49580 |
8.23 |
| 2026-09-23 00:00 |
10:07:34.68 |
+29:06:30.4 |
HIP 49580 |
8.89 |
| 2026-09-23 12:00 |
10:07:39.95 |
+29:06:20.8 |
HIP 49580 |
9.63 |
| 2026-09-24 00:00 |
10:07:45.19 |
+29:06:11.4 |
HIP 49580 |
10.45 |
| 2026-09-24 12:00 |
10:07:50.39 |
+29:06:02.4 |
HIP 49580 |
11.31 |
| 2026-09-25 00:00 |
10:07:55.57 |
+29:05:53.8 |
HIP 49580 |
12.21 |
| 2026-09-25 12:00 |
10:08:00.71 |
+29:05:45.6 |
HIP 49580 |
13.14 |
| 2026-09-26 00:00 |
10:08:05.83 |
+29:05:37.7 |
HIP 49580 |
14.09 |
| 2026-09-26 12:00 |
10:08:10.91 |
+29:05:30.1 |
HIP 49580 |
15.06 |
| 2026-09-27 00:00 |
10:08:15.96 |
+29:05:22.9 |
HIP 49580 |
16.04 |
| 2026-09-27 12:00 |
10:08:20.98 |
+29:05:16.1 |
HIP 49580 |
17.02 |
| 2026-09-28 00:00 |
10:08:25.96 |
+29:05:09.7 |
HIP 49580 |
18.01 |
| 2026-09-28 12:00 |
10:08:30.91 |
+29:05:03.6 |
HIP 49580 |
18.99 |
| 2026-09-29 00:00 |
10:08:35.83 |
+29:04:57.9 |
HIP 49580 |
19.98 |
| 2026-09-29 12:00 |
10:08:40.71 |
+29:04:52.5 |
HIP 49580 |
20.97 |
| 2026-09-30 00:00 |
10:08:45.56 |
+29:04:47.5 |
HIP 49580 |
21.96 |
| 2026-09-30 12:00 |
10:08:50.37 |
+29:04:42.9 |
HIP 49580 |
22.95 |
| 2026-10-01 00:00 |
10:08:55.15 |
+29:04:38.6 |
HIP 49580 |
23.93 |
| 2026-10-01 12:00 |
10:08:59.89 |
+29:04:34.8 |
HIP 49580 |
24.90 |
| 2026-10-02 00:00 |
10:09:04.60 |
+29:04:31.3 |
HIP 49580 |
25.88 |
| 2026-10-02 12:00 |
10:09:09.26 |
+29:04:28.2 |
HIP 49580 |
26.84 |
| 2026-10-03 00:00 |
10:09:13.90 |
+29:04:25.4 |
HIP 49580 |
27.80 |
| 2026-10-03 12:00 |
10:09:18.49 |
+29:04:23.0 |
HIP 49580 |
28.76 |
| 2026-10-04 00:00 |
10:09:23.05 |
+29:04:21.0 |
HIP 49580 |
29.70 |
| 2026-10-04 12:00 |
10:09:27.57 |
+29:04:19.4 |
HIP 49580 |
30.64 |
| 2026-10-05 00:00 |
10:09:32.05 |
+29:04:18.2 |
HIP 49580 |
31.58 |
| 2026-10-05 12:00 |
10:09:36.49 |
+29:04:17.4 |
HIP 49580 |
32.50 |
| 2026-10-06 00:00 |
10:09:40.89 |
+29:04:16.9 |
HIP 49580 |
33.42 |
| 2026-10-06 12:00 |
10:09:45.26 |
+29:04:16.8 |
HIP 49580 |
34.33 |
| 2026-10-07 00:00 |
10:09:49.58 |
+29:04:17.2 |
HIP 49580 |
35.24 |
| 2026-10-07 12:00 |
10:09:53.86 |
+29:04:17.9 |
HIP 49947 |
35.23 |
| 2026-10-08 00:00 |
10:09:58.10 |
+29:04:19.0 |
HIP 49947 |
34.55 |
| 2026-10-08 12:00 |
10:10:02.30 |
+29:04:20.4 |
HIP 49947 |
33.89 |
| 2026-10-09 00:00 |
10:10:06.46 |
+29:04:22.3 |
HIP 49947 |
33.24 |
| 2026-10-09 12:00 |
10:10:10.57 |
+29:04:24.6 |
HIP 49947 |
32.60 |
| 2026-10-10 00:00 |
10:10:14.64 |
+29:04:27.3 |
HIP 49947 |
31.97 |
| 2026-10-10 12:00 |
10:10:18.67 |
+29:04:30.3 |
HIP 49947 |
31.36 |
| 2026-10-11 00:00 |
10:10:22.65 |
+29:04:33.8 |
HIP 49947 |
30.76 |