C/2019 M3 (ATLAS)
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 |
2019-10-10 |
+3.4350 |
-1.764 |
| 2019-10-10 |
2020-11-22 |
-55.9094 |
+32.992 |
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) |
| 2026-02-03 00:00 |
23:14:27.99 |
-52:27:42.5 |
HIP 114710 |
14.06 |
| 2026-02-03 12:00 |
23:14:36.20 |
-52:26:54.8 |
HIP 114710 |
15.13 |
| 2026-02-04 00:00 |
23:14:44.45 |
-52:26:07.3 |
HIP 114710 |
16.26 |
| 2026-02-04 12:00 |
23:14:52.74 |
-52:25:20.3 |
HIP 114710 |
17.44 |
| 2026-02-05 00:00 |
23:15:01.06 |
-52:24:33.6 |
HIP 114710 |
18.66 |
| 2026-02-05 12:00 |
23:15:09.42 |
-52:23:47.3 |
HIP 114710 |
19.91 |
| 2026-02-06 00:00 |
23:15:17.81 |
-52:23:01.4 |
HIP 114710 |
21.20 |
| 2026-02-06 12:00 |
23:15:26.24 |
-52:22:15.8 |
HIP 114710 |
22.50 |
| 2026-02-07 00:00 |
23:15:34.70 |
-52:21:30.7 |
HIP 114710 |
23.83 |
| 2026-02-07 12:00 |
23:15:43.20 |
-52:20:45.9 |
HIP 114709 |
24.19 |
| 2026-02-08 00:00 |
23:15:51.72 |
-52:20:01.5 |
HIP 114709 |
24.42 |
| 2026-02-08 12:00 |
23:16:00.28 |
-52:19:17.5 |
HIP 114709 |
24.76 |
| 2026-02-09 00:00 |
23:16:08.88 |
-52:18:33.9 |
HIP 114709 |
25.19 |
| 2026-02-09 12:00 |
23:16:17.50 |
-52:17:50.7 |
HIP 114874 |
25.60 |
| 2026-02-10 00:00 |
23:16:26.15 |
-52:17:07.9 |
HIP 114874 |
25.03 |
| 2026-02-10 12:00 |
23:16:34.83 |
-52:16:25.5 |
HIP 114874 |
24.55 |
| 2026-02-11 00:00 |
23:16:43.55 |
-52:15:43.5 |
HIP 114946 |
24.08 |
| 2026-02-11 12:00 |
23:16:52.29 |
-52:15:01.9 |
HIP 114946 |
23.31 |
| 2026-02-12 00:00 |
23:17:01.06 |
-52:14:20.7 |
HIP 114946 |
22.62 |
| 2026-02-12 12:00 |
23:17:09.86 |
-52:13:40.0 |
HIP 114946 |
22.03 |
| 2026-02-13 00:00 |
23:17:18.68 |
-52:12:59.7 |
HIP 114946 |
21.53 |
| 2026-02-13 12:00 |
23:17:27.53 |
-52:12:19.8 |
HIP 114946 |
21.14 |
| 2026-02-14 00:00 |
23:17:36.41 |
-52:11:40.3 |
HIP 114946 |
20.86 |
| 2026-02-14 12:00 |
23:17:45.32 |
-52:11:01.2 |
HIP 114946 |
20.69 |
| 2026-02-15 00:00 |
23:17:54.25 |
-52:10:22.6 |
HIP 114946 |
20.64 |
| 2026-02-15 12:00 |
23:18:03.20 |
-52:09:44.5 |
HIP 114946 |
20.72 |
| 2026-02-16 00:00 |
23:18:12.18 |
-52:09:06.7 |
HIP 114946 |
20.91 |
| 2026-02-16 12:00 |
23:18:21.18 |
-52:08:29.4 |
HIP 114946 |
21.22 |
| 2026-02-17 00:00 |
23:18:30.21 |
-52:07:52.6 |
HIP 115205 |
20.06 |
| 2026-02-17 12:00 |
23:18:39.25 |
-52:07:16.2 |
HIP 115205 |
18.66 |
| 2026-02-18 00:00 |
23:18:48.32 |
-52:06:40.3 |
HIP 115205 |
17.27 |
| 2026-02-18 12:00 |
23:18:57.41 |
-52:06:04.8 |
HIP 115205 |
15.91 |
| 2026-02-19 00:00 |
23:19:06.52 |
-52:05:29.8 |
HIP 115205 |
14.59 |
| 2026-02-19 12:00 |
23:19:15.65 |
-52:04:55.2 |
HIP 115205 |
13.31 |
| 2026-02-20 00:00 |
23:19:24.81 |
-52:04:21.1 |
HIP 115205 |
12.09 |
| 2026-02-20 12:00 |
23:19:33.97 |
-52:03:47.5 |
HIP 115205 |
10.96 |
| 2026-02-21 00:00 |
23:19:43.16 |
-52:03:14.3 |
HIP 115205 |
9.93 |
| 2026-02-21 12:00 |
23:19:52.37 |
-52:02:41.6 |
HIP 115205 |
9.05 |
| 2026-02-22 00:00 |
23:20:01.59 |
-52:02:09.4 |
HIP 115205 |
8.37 |
| 2026-02-22 12:00 |
23:20:10.83 |
-52:01:37.6 |
HIP 115205 |
7.93 |
| 2026-02-23 00:00 |
23:20:20.08 |
-52:01:06.4 |
HIP 115205 |
7.77 |
| 2026-02-23 12:00 |
23:20:29.35 |
-52:00:35.6 |
HIP 115205 |
7.92 |
| 2026-02-24 00:00 |
23:20:38.64 |
-52:00:05.3 |
HIP 115205 |
8.35 |