メタデータ
| 項目 |
値 |
| Designation |
C/2019 M3 (ATLAS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2019-01-03T01:14:33.895680Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:57Z |
| Obs used |
340 |
| NEO |
- |
| M1 |
13.800 |
| K1 |
6.000 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2019-06-30T12:24:39.600000Z |
| Discovery magnitude (MPC) |
19.39 c |
| 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) |
2019-08-04.0000000 |
| e |
1.00221470 |
| q (au) |
2.417809 |
| a (au) |
-1091.709033 |
| i (deg) |
99.436295 |
| Ω (om, deg) |
154.896272 |
| ω (w, deg) |
87.935053 |
| M (ma, deg) |
0.005819 |
等級
散乱 + 全体線形
$$
M_a = (13.222 + 2.205\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
13.222 |
| n |
2.205 |
| 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 |
| 2019-06-30 |
2019-09-05 |
+4.9840 |
-2.533 |
| 2019-09-05 |
2020-11-22 |
-48.4696 |
+27.440 |
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 |
23:45:05.50 |
-53:14:46.5 |
HIP 117240 |
11.51 |
| 2026-06-01 12:00 |
23:45:08.43 |
-53:15:59.7 |
HIP 117240 |
10.95 |
| 2026-06-02 00:00 |
23:45:11.29 |
-53:17:13.3 |
HIP 117240 |
10.53 |
| 2026-06-02 12:00 |
23:45:14.07 |
-53:18:27.2 |
HIP 117240 |
10.27 |
| 2026-06-03 00:00 |
23:45:16.78 |
-53:19:41.5 |
HIP 117240 |
10.19 |
| 2026-06-03 12:00 |
23:45:19.42 |
-53:20:56.2 |
HIP 117240 |
10.28 |
| 2026-06-04 00:00 |
23:45:21.99 |
-53:22:11.2 |
HIP 117240 |
10.55 |
| 2026-06-04 12:00 |
23:45:24.47 |
-53:23:26.5 |
HIP 117240 |
10.99 |
| 2026-06-05 00:00 |
23:45:26.89 |
-53:24:42.2 |
HIP 117240 |
11.56 |
| 2026-06-05 12:00 |
23:45:29.23 |
-53:25:58.2 |
HIP 117240 |
12.27 |
| 2026-06-06 00:00 |
23:45:31.50 |
-53:27:14.6 |
HIP 117240 |
13.07 |
| 2026-06-06 12:00 |
23:45:33.69 |
-53:28:31.2 |
HIP 117240 |
13.97 |
| 2026-06-07 00:00 |
23:45:35.80 |
-53:29:48.2 |
HIP 117240 |
14.94 |
| 2026-06-07 12:00 |
23:45:37.84 |
-53:31:05.6 |
HIP 117240 |
15.97 |
| 2026-06-08 00:00 |
23:45:39.80 |
-53:32:23.2 |
HIP 117240 |
17.05 |
| 2026-06-08 12:00 |
23:45:41.69 |
-53:33:41.2 |
HIP 117240 |
18.17 |
| 2026-06-09 00:00 |
23:45:43.50 |
-53:34:59.4 |
HIP 117240 |
19.33 |
| 2026-06-09 12:00 |
23:45:45.23 |
-53:36:18.0 |
HIP 117240 |
20.51 |
| 2026-06-10 00:00 |
23:45:46.89 |
-53:37:36.9 |
HIP 117240 |
21.72 |
| 2026-06-10 12:00 |
23:45:48.47 |
-53:38:56.0 |
HIP 117240 |
22.95 |
| 2026-06-11 00:00 |
23:45:49.97 |
-53:40:15.5 |
HIP 117240 |
24.21 |
| 2026-06-11 12:00 |
23:45:51.39 |
-53:41:35.2 |
HIP 117240 |
25.47 |
| 2026-06-12 00:00 |
23:45:52.73 |
-53:42:55.2 |
HIP 117240 |
26.75 |
| 2026-06-12 12:00 |
23:45:54.00 |
-53:44:15.5 |
HIP 117240 |
28.05 |
| 2026-06-13 00:00 |
23:45:55.19 |
-53:45:36.0 |
HIP 117243 |
27.97 |
| 2026-06-13 12:00 |
23:45:56.29 |
-53:46:56.9 |
HIP 117243 |
26.62 |
| 2026-06-14 00:00 |
23:45:57.32 |
-53:48:17.9 |
HIP 117243 |
25.26 |
| 2026-06-14 12:00 |
23:45:58.27 |
-53:49:39.3 |
HIP 117243 |
23.90 |
| 2026-06-15 00:00 |
23:45:59.14 |
-53:51:00.8 |
HIP 117243 |
22.54 |
| 2026-06-15 12:00 |
23:45:59.92 |
-53:52:22.6 |
HIP 117243 |
21.17 |
| 2026-06-16 00:00 |
23:46:00.63 |
-53:53:44.7 |
HIP 117243 |
19.80 |
| 2026-06-16 12:00 |
23:46:01.26 |
-53:55:07.0 |
HIP 117243 |
18.44 |
| 2026-06-17 00:00 |
23:46:01.81 |
-53:56:29.5 |
HIP 117243 |
17.07 |
| 2026-06-17 12:00 |
23:46:02.27 |
-53:57:52.2 |
HIP 117243 |
15.70 |
| 2026-06-18 00:00 |
23:46:02.66 |
-53:59:15.1 |
HIP 117243 |
14.33 |
| 2026-06-18 12:00 |
23:46:02.96 |
-54:00:38.3 |
HIP 117243 |
12.97 |
| 2026-06-19 00:00 |
23:46:03.19 |
-54:02:01.6 |
HIP 117243 |
11.61 |
| 2026-06-19 12:00 |
23:46:03.33 |
-54:03:25.2 |
HIP 117243 |
10.26 |
| 2026-06-20 00:00 |
23:46:03.39 |
-54:04:48.9 |
HIP 117243 |
8.93 |
| 2026-06-20 12:00 |
23:46:03.37 |
-54:06:12.8 |
HIP 117243 |
7.62 |
| 2026-06-21 00:00 |
23:46:03.27 |
-54:07:36.9 |
HIP 117243 |
6.34 |
| 2026-06-21 12:00 |
23:46:03.08 |
-54:09:01.2 |
HIP 117243 |
5.14 |
| 2026-06-22 00:00 |
23:46:02.82 |
-54:10:25.6 |
HIP 117243 |
4.08 |