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) |
| 2026-06-01 00:00 |
12:50:54.32 |
-60:03:59.8 |
HIP 62732 |
16.06 |
| 2026-06-01 12:00 |
12:50:48.63 |
-60:02:11.6 |
HIP 62732 |
17.97 |
| 2026-06-02 00:00 |
12:50:43.08 |
-60:00:23.2 |
HIP 62732 |
19.88 |
| 2026-06-02 12:00 |
12:50:37.68 |
-59:58:34.6 |
HIP 62732 |
21.80 |
| 2026-06-03 00:00 |
12:50:32.42 |
-59:56:45.7 |
HIP 62732 |
23.71 |
| 2026-06-03 12:00 |
12:50:27.30 |
-59:54:56.6 |
HIP 62434 |
24.71 |
| 2026-06-04 00:00 |
12:50:22.33 |
-59:53:07.4 |
HIP 62434 |
23.22 |
| 2026-06-04 12:00 |
12:50:17.50 |
-59:51:17.9 |
HIP 62434 |
21.82 |
| 2026-06-05 00:00 |
12:50:12.82 |
-59:49:28.3 |
HIP 62434 |
20.51 |
| 2026-06-05 12:00 |
12:50:08.28 |
-59:47:38.5 |
HIP 62434 |
19.32 |
| 2026-06-06 00:00 |
12:50:03.88 |
-59:45:48.6 |
HIP 62434 |
18.27 |
| 2026-06-06 12:00 |
12:49:59.63 |
-59:43:58.5 |
HIP 62434 |
17.39 |
| 2026-06-07 00:00 |
12:49:55.52 |
-59:42:08.3 |
HIP 62434 |
16.70 |
| 2026-06-07 12:00 |
12:49:51.56 |
-59:40:17.9 |
HIP 62434 |
16.22 |
| 2026-06-08 00:00 |
12:49:47.74 |
-59:38:27.5 |
HIP 62434 |
15.97 |
| 2026-06-08 12:00 |
12:49:44.07 |
-59:36:36.9 |
HIP 62434 |
15.96 |
| 2026-06-09 00:00 |
12:49:40.54 |
-59:34:46.3 |
HIP 62434 |
16.20 |
| 2026-06-09 12:00 |
12:49:37.16 |
-59:32:55.5 |
HIP 62434 |
16.66 |
| 2026-06-10 00:00 |
12:49:33.92 |
-59:31:04.7 |
HIP 62434 |
17.34 |
| 2026-06-10 12:00 |
12:49:30.82 |
-59:29:13.9 |
HIP 62434 |
18.20 |
| 2026-06-11 00:00 |
12:49:27.87 |
-59:27:23.0 |
HIP 62434 |
19.22 |
| 2026-06-11 12:00 |
12:49:25.07 |
-59:25:32.0 |
HIP 62434 |
20.38 |
| 2026-06-12 00:00 |
12:49:22.41 |
-59:23:41.0 |
HIP 62434 |
21.65 |
| 2026-06-12 12:00 |
12:49:19.90 |
-59:21:50.1 |
HIP 62434 |
23.02 |
| 2026-06-13 00:00 |
12:49:17.53 |
-59:19:59.1 |
HIP 62434 |
24.46 |
| 2026-06-13 12:00 |
12:49:15.30 |
-59:18:08.1 |
HIP 62434 |
25.96 |
| 2026-06-14 00:00 |
12:49:13.22 |
-59:16:17.1 |
HIP 62434 |
27.52 |
| 2026-06-14 12:00 |
12:49:11.29 |
-59:14:26.1 |
HIP 62434 |
29.12 |
| 2026-06-15 00:00 |
12:49:09.50 |
-59:12:35.2 |
HIP 62434 |
30.75 |
| 2026-06-15 12:00 |
12:49:07.85 |
-59:10:44.3 |
HIP 62434 |
32.42 |
| 2026-06-16 00:00 |
12:49:06.35 |
-59:08:53.5 |
HIP 62434 |
34.11 |
| 2026-06-16 12:00 |
12:49:04.99 |
-59:07:02.8 |
HIP 62823 |
34.07 |
| 2026-06-17 00:00 |
12:49:03.78 |
-59:05:12.1 |
HIP 62823 |
33.03 |
| 2026-06-17 12:00 |
12:49:02.71 |
-59:03:21.5 |
HIP 62823 |
32.04 |
| 2026-06-18 00:00 |
12:49:01.78 |
-59:01:31.1 |
HIP 62823 |
31.12 |
| 2026-06-18 12:00 |
12:49:00.99 |
-58:59:40.7 |
HIP 62823 |
30.27 |
| 2026-06-19 00:00 |
12:49:00.35 |
-58:57:50.5 |
HIP 62823 |
29.50 |
| 2026-06-19 12:00 |
12:48:59.85 |
-58:56:00.3 |
HIP 62823 |
28.81 |
| 2026-06-20 00:00 |
12:48:59.50 |
-58:54:10.4 |
HIP 62560 |
27.27 |
| 2026-06-20 12:00 |
12:48:59.28 |
-58:52:20.5 |
HIP 62560 |
25.44 |
| 2026-06-21 00:00 |
12:48:59.21 |
-58:50:30.9 |
HIP 62560 |
23.62 |
| 2026-06-21 12:00 |
12:48:59.27 |
-58:48:41.4 |
HIP 62560 |
21.79 |
| 2026-06-22 00:00 |
12:48:59.48 |
-58:46:52.1 |
HIP 62560 |
19.97 |