メタデータ
| 項目 |
値 |
| Designation |
C/2019 L3 (ATLAS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2022-01-09T15:10:58.644480Z |
| Orbit solution date (soln_date, UTC) |
2025-06-26T10:12:44Z |
| Obs used |
6499 |
| NEO |
- |
| M1 |
5.500 |
| K1 |
8.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2019-06-10T13:29:16.886400Z |
| Discovery magnitude (MPC) |
18.18 o |
| Discovery observatory (MPC) |
T05 · ATLAS-HKO, Haleakala |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2021-10-10.0000000 |
| e |
1.00140528 |
| q (au) |
3.554493 |
| a (au) |
-2529.392057 |
| i (deg) |
48.363747 |
| Ω (om, deg) |
290.788887 |
| ω (w, deg) |
171.613705 |
| M (ma, deg) |
-0.000710 |
等級
散乱 + 全体線形
$$
M_a = (1.726 + 4.845\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
1.726 |
| n |
4.845 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
1.000 |
| 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
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) |
終了日 (UTC) |
a |
b |
| 2019-06-10 |
2021-01-28 |
+0.5076 |
-0.218 |
| 2021-01-28 |
2022-01-09 |
+4.9638 |
-3.456 |
| 2022-01-09 |
2022-10-05 |
-9.9787 |
+4.854 |
| 2022-10-05 |
2025-05-29 |
+1.8997 |
-2.463 |
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 |
13:18:40.65 |
-55:41:03.8 |
HIP 65129 |
19.28 |
| 2026-09-20 12:00 |
13:18:56.89 |
-55:41:04.9 |
HIP 65129 |
17.16 |
| 2026-09-21 00:00 |
13:19:13.16 |
-55:41:06.8 |
HIP 65129 |
15.08 |
| 2026-09-21 12:00 |
13:19:29.46 |
-55:41:09.4 |
HIP 65129 |
13.06 |
| 2026-09-22 00:00 |
13:19:45.79 |
-55:41:12.7 |
HIP 65129 |
11.14 |
| 2026-09-22 12:00 |
13:20:02.16 |
-55:41:16.7 |
HIP 65129 |
9.38 |
| 2026-09-23 00:00 |
13:20:18.55 |
-55:41:21.4 |
HIP 65129 |
7.89 |
| 2026-09-23 12:00 |
13:20:34.98 |
-55:41:26.9 |
HIP 65129 |
6.86 |
| 2026-09-24 00:00 |
13:20:51.43 |
-55:41:33.0 |
HIP 65129 |
6.51 |
| 2026-09-24 12:00 |
13:21:07.91 |
-55:41:39.9 |
HIP 65129 |
6.95 |
| 2026-09-25 00:00 |
13:21:24.42 |
-55:41:47.5 |
HIP 65129 |
8.05 |
| 2026-09-25 12:00 |
13:21:40.95 |
-55:41:55.8 |
HIP 65129 |
9.60 |
| 2026-09-26 00:00 |
13:21:57.51 |
-55:42:04.8 |
HIP 65129 |
11.41 |
| 2026-09-26 12:00 |
13:22:14.10 |
-55:42:14.5 |
HIP 65129 |
13.39 |
| 2026-09-27 00:00 |
13:22:30.71 |
-55:42:24.9 |
HIP 65129 |
15.46 |
| 2026-09-27 12:00 |
13:22:47.35 |
-55:42:36.0 |
HIP 65129 |
17.60 |
| 2026-09-28 00:00 |
13:23:04.01 |
-55:42:47.8 |
HIP 65402 |
16.34 |
| 2026-09-28 12:00 |
13:23:20.70 |
-55:43:00.3 |
HIP 65402 |
14.82 |
| 2026-09-29 00:00 |
13:23:37.41 |
-55:43:13.5 |
HIP 65402 |
13.52 |
| 2026-09-29 12:00 |
13:23:54.14 |
-55:43:27.4 |
HIP 65402 |
12.52 |
| 2026-09-30 00:00 |
13:24:10.89 |
-55:43:42.0 |
HIP 65402 |
11.90 |
| 2026-09-30 12:00 |
13:24:27.67 |
-55:43:57.3 |
HIP 65402 |
11.72 |
| 2026-10-01 00:00 |
13:24:44.47 |
-55:44:13.3 |
HIP 65402 |
12.01 |
| 2026-10-01 12:00 |
13:25:01.28 |
-55:44:30.0 |
HIP 65402 |
12.73 |
| 2026-10-02 00:00 |
13:25:18.12 |
-55:44:47.3 |
HIP 65402 |
13.82 |
| 2026-10-02 12:00 |
13:25:34.98 |
-55:45:05.4 |
HIP 65423 |
14.90 |
| 2026-10-03 00:00 |
13:25:51.86 |
-55:45:24.1 |
HIP 65423 |
16.12 |
| 2026-10-03 12:00 |
13:26:08.75 |
-55:45:43.5 |
HIP 65423 |
17.57 |
| 2026-10-04 00:00 |
13:26:25.67 |
-55:46:03.6 |
HIP 65718 |
16.61 |
| 2026-10-04 12:00 |
13:26:42.60 |
-55:46:24.4 |
HIP 65718 |
14.22 |
| 2026-10-05 00:00 |
13:26:59.55 |
-55:46:45.9 |
HIP 65718 |
11.83 |
| 2026-10-05 12:00 |
13:27:16.51 |
-55:47:08.0 |
HIP 65718 |
9.45 |
| 2026-10-06 00:00 |
13:27:33.49 |
-55:47:30.9 |
HIP 65718 |
7.09 |
| 2026-10-06 12:00 |
13:27:50.48 |
-55:47:54.4 |
HIP 65718 |
4.80 |
| 2026-10-07 00:00 |
13:28:07.49 |
-55:48:18.5 |
HIP 65718 |
2.73 |
| 2026-10-07 12:00 |
13:28:24.51 |
-55:48:43.4 |
HIP 65718 |
1.93 |
| 2026-10-08 00:00 |
13:28:41.55 |
-55:49:08.9 |
HIP 65718 |
3.44 |
| 2026-10-08 12:00 |
13:28:58.60 |
-55:49:35.1 |
HIP 65718 |
5.65 |
| 2026-10-09 00:00 |
13:29:15.66 |
-55:50:02.0 |
HIP 65718 |
7.99 |
| 2026-10-09 12:00 |
13:29:32.73 |
-55:50:29.5 |
HIP 65718 |
10.38 |
| 2026-10-10 00:00 |
13:29:49.81 |
-55:50:57.7 |
HIP 65718 |
12.80 |
| 2026-10-10 12:00 |
13:30:06.90 |
-55:51:26.6 |
HIP 65718 |
15.22 |
| 2026-10-11 00:00 |
13:30:24.00 |
-55:51:56.1 |
HIP 65718 |
17.66 |