メタデータ
| 項目 |
値 |
| Designation |
C/2020 M3 (ATLAS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2020-10-25T14:58:23.448000Z |
| Orbit solution date (soln_date, UTC) |
2022-04-23T03:12:26Z |
| Obs used |
2344 |
| NEO |
Yes |
| M1 |
14.600 |
| K1 |
6.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2020-06-27T13:57:10.627200Z |
| Discovery magnitude (MPC) |
18.89 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) |
2020-11-26.0000000 |
| e |
0.95270763 |
| q (au) |
1.268249 |
| a (au) |
26.817195 |
| i (deg) |
23.473528 |
| Ω (om, deg) |
71.250235 |
| ω (w, deg) |
328.446314 |
| M (ma, deg) |
0.222681 |
等級
散乱 + 全体線形
$$
M_a = (14.015 + 2.681\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
14.015 |
| n |
2.681 |
| gf |
0.993 |
| gb |
-1.000 |
| k |
0.999 |
| δ90 |
1.000 |
| 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
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) |
終了日 (UTC) |
a |
b |
| 2012-01-10 |
2020-08-06 |
-14.0320 |
+4.994 |
| 2020-08-06 |
2020-10-25 |
+30.0861 |
-5.641 |
| 2020-10-25 |
2021-06-10 |
+4.2695 |
-2.068 |
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 |
13:18:01.50 |
+12:10:54.6 |
HIP 64881 |
3.84 |
| 2026-09-20 12:00 |
13:18:08.24 |
+12:10:00.3 |
HIP 64881 |
5.22 |
| 2026-09-21 00:00 |
13:18:15.01 |
+12:09:06.3 |
HIP 64881 |
6.85 |
| 2026-09-21 12:00 |
13:18:21.79 |
+12:08:12.4 |
HIP 64881 |
8.58 |
| 2026-09-22 00:00 |
13:18:28.59 |
+12:07:18.7 |
HIP 64881 |
10.36 |
| 2026-09-22 12:00 |
13:18:35.40 |
+12:06:25.2 |
HIP 64881 |
12.18 |
| 2026-09-23 00:00 |
13:18:42.24 |
+12:05:31.9 |
HIP 64881 |
14.02 |
| 2026-09-23 12:00 |
13:18:49.09 |
+12:04:38.8 |
HIP 64948 |
14.68 |
| 2026-09-24 00:00 |
13:18:55.95 |
+12:03:45.9 |
HIP 64948 |
13.95 |
| 2026-09-24 12:00 |
13:19:02.83 |
+12:02:53.2 |
HIP 64948 |
13.45 |
| 2026-09-25 00:00 |
13:19:09.73 |
+12:02:00.6 |
HIP 64948 |
13.21 |
| 2026-09-25 12:00 |
13:19:16.64 |
+12:01:08.3 |
HIP 64948 |
13.25 |
| 2026-09-26 00:00 |
13:19:23.57 |
+12:00:16.2 |
HIP 64948 |
13.57 |
| 2026-09-26 12:00 |
13:19:30.51 |
+11:59:24.3 |
HIP 64948 |
14.14 |
| 2026-09-27 00:00 |
13:19:37.47 |
+11:58:32.6 |
HIP 64948 |
14.94 |
| 2026-09-27 12:00 |
13:19:44.44 |
+11:57:41.1 |
HIP 64948 |
15.94 |
| 2026-09-28 00:00 |
13:19:51.42 |
+11:56:49.8 |
HIP 64948 |
17.09 |
| 2026-09-28 12:00 |
13:19:58.41 |
+11:55:58.7 |
HIP 64948 |
18.38 |
| 2026-09-29 00:00 |
13:20:05.42 |
+11:55:07.9 |
HIP 64948 |
19.77 |
| 2026-09-29 12:00 |
13:20:12.44 |
+11:54:17.3 |
HIP 65104 |
21.15 |
| 2026-09-30 00:00 |
13:20:19.48 |
+11:53:26.9 |
HIP 65104 |
21.67 |
| 2026-09-30 12:00 |
13:20:26.52 |
+11:52:36.7 |
HIP 65104 |
22.34 |
| 2026-10-01 00:00 |
13:20:33.58 |
+11:51:46.7 |
HIP 65104 |
23.15 |
| 2026-10-01 12:00 |
13:20:40.64 |
+11:50:57.0 |
HIP 65104 |
24.08 |
| 2026-10-02 00:00 |
13:20:47.72 |
+11:50:07.5 |
HIP 65104 |
25.12 |
| 2026-10-02 12:00 |
13:20:54.81 |
+11:49:18.3 |
HIP 65104 |
26.25 |
| 2026-10-03 00:00 |
13:21:01.90 |
+11:48:29.3 |
HIP 65104 |
27.47 |
| 2026-10-03 12:00 |
13:21:09.01 |
+11:47:40.5 |
HIP 65104 |
28.76 |
| 2026-10-04 00:00 |
13:21:16.13 |
+11:46:52.0 |
HIP 65104 |
30.11 |
| 2026-10-04 12:00 |
13:21:23.25 |
+11:46:03.7 |
HIP 65104 |
31.52 |
| 2026-10-05 00:00 |
13:21:30.38 |
+11:45:15.7 |
HIP 65104 |
32.98 |
| 2026-10-05 12:00 |
13:21:37.52 |
+11:44:27.9 |
HIP 65292 |
32.82 |
| 2026-10-06 00:00 |
13:21:44.67 |
+11:43:40.4 |
HIP 65292 |
31.19 |
| 2026-10-06 12:00 |
13:21:51.83 |
+11:42:53.1 |
HIP 65292 |
29.59 |
| 2026-10-07 00:00 |
13:21:58.99 |
+11:42:06.1 |
HIP 65292 |
28.04 |
| 2026-10-07 12:00 |
13:22:06.16 |
+11:41:19.4 |
HIP 65292 |
26.55 |
| 2026-10-08 00:00 |
13:22:13.33 |
+11:40:32.9 |
HIP 65292 |
25.11 |
| 2026-10-08 12:00 |
13:22:20.51 |
+11:39:46.7 |
HIP 65292 |
23.74 |
| 2026-10-09 00:00 |
13:22:27.69 |
+11:39:00.8 |
HIP 65292 |
22.46 |
| 2026-10-09 12:00 |
13:22:34.88 |
+11:38:15.1 |
HIP 65292 |
21.28 |
| 2026-10-10 00:00 |
13:22:42.08 |
+11:37:29.8 |
HIP 65292 |
20.22 |
| 2026-10-10 12:00 |
13:22:49.27 |
+11:36:44.7 |
HIP 65292 |
19.30 |
| 2026-10-11 00:00 |
13:22:56.47 |
+11:35:59.8 |
HIP 65292 |
18.53 |