C/2019 T5 (ATLAS)
メタデータ
| 項目 |
値 |
| Designation |
C/2019 T5 (ATLAS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2019-08-01T03:25:59.563200Z |
| Orbit solution date (soln_date, UTC) |
2021-05-02T23:42:54Z |
| Obs used |
80 |
| NEO |
- |
| M1 |
14.900 |
| K1 |
9.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2019-10-08T14:44:47.270400Z |
| Discovery magnitude (MPC) |
18.99 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) |
2019-11-03.0000000 |
| e |
0.80920592 |
| q (au) |
1.528889 |
| a (au) |
8.013295 |
| i (deg) |
33.422394 |
| Ω (om, deg) |
247.696368 |
| ω (w, deg) |
189.617261 |
| M (ma, deg) |
4.078062 |
等級
散乱 + 全体線形
$$
M_a = (13.884 + 4.415\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
13.884 |
| n |
4.415 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
0.996 |
| 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
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
16:19:27.45 |
-24:22:17.0 |
HIP 80079 |
20.17 |
| 2026-02-03 12:00 |
16:19:32.48 |
-24:22:25.3 |
HIP 80079 |
19.36 |
| 2026-02-04 00:00 |
16:19:37.44 |
-24:22:33.4 |
HIP 80079 |
18.58 |
| 2026-02-04 12:00 |
16:19:42.32 |
-24:22:41.4 |
HIP 80079 |
17.86 |
| 2026-02-05 00:00 |
16:19:47.13 |
-24:22:49.1 |
HIP 80079 |
17.20 |
| 2026-02-05 12:00 |
16:19:51.86 |
-24:22:56.7 |
HIP 80079 |
16.58 |
| 2026-02-06 00:00 |
16:19:56.52 |
-24:23:04.2 |
HIP 80079 |
16.03 |
| 2026-02-06 12:00 |
16:20:01.10 |
-24:23:11.5 |
HIP 80079 |
15.53 |
| 2026-02-07 00:00 |
16:20:05.60 |
-24:23:18.6 |
HIP 80079 |
15.10 |
| 2026-02-07 12:00 |
16:20:10.02 |
-24:23:25.5 |
HIP 80079 |
14.74 |
| 2026-02-08 00:00 |
16:20:14.37 |
-24:23:32.3 |
HIP 80079 |
14.44 |
| 2026-02-08 12:00 |
16:20:18.64 |
-24:23:38.9 |
HIP 80079 |
14.21 |
| 2026-02-09 00:00 |
16:20:22.83 |
-24:23:45.3 |
HIP 80079 |
14.04 |
| 2026-02-09 12:00 |
16:20:26.94 |
-24:23:51.5 |
HIP 80079 |
13.94 |
| 2026-02-10 00:00 |
16:20:30.97 |
-24:23:57.6 |
HIP 80079 |
13.90 |
| 2026-02-10 12:00 |
16:20:34.93 |
-24:24:03.5 |
HIP 80079 |
13.92 |
| 2026-02-11 00:00 |
16:20:38.80 |
-24:24:09.2 |
HIP 80079 |
14.00 |
| 2026-02-11 12:00 |
16:20:42.59 |
-24:24:14.7 |
HIP 80079 |
14.12 |
| 2026-02-12 00:00 |
16:20:46.30 |
-24:24:20.0 |
HIP 80079 |
14.30 |
| 2026-02-12 12:00 |
16:20:49.94 |
-24:24:25.2 |
HIP 80079 |
14.51 |
| 2026-02-13 00:00 |
16:20:53.49 |
-24:24:30.2 |
HIP 80079 |
14.76 |
| 2026-02-13 12:00 |
16:20:56.95 |
-24:24:35.0 |
HIP 80079 |
15.05 |
| 2026-02-14 00:00 |
16:21:00.34 |
-24:24:39.6 |
HIP 80079 |
15.36 |
| 2026-02-14 12:00 |
16:21:03.65 |
-24:24:44.0 |
HIP 80079 |
15.69 |
| 2026-02-15 00:00 |
16:21:06.87 |
-24:24:48.3 |
HIP 80079 |
16.04 |
| 2026-02-15 12:00 |
16:21:10.01 |
-24:24:52.3 |
HIP 80196 |
16.21 |
| 2026-02-16 00:00 |
16:21:13.06 |
-24:24:56.2 |
HIP 80196 |
15.54 |
| 2026-02-16 12:00 |
16:21:16.03 |
-24:24:59.9 |
HIP 80196 |
14.89 |
| 2026-02-17 00:00 |
16:21:18.92 |
-24:25:03.4 |
HIP 80196 |
14.26 |
| 2026-02-17 12:00 |
16:21:21.73 |
-24:25:06.7 |
HIP 80196 |
13.66 |
| 2026-02-18 00:00 |
16:21:24.45 |
-24:25:09.8 |
HIP 80196 |
13.07 |
| 2026-02-18 12:00 |
16:21:27.08 |
-24:25:12.7 |
HIP 80196 |
12.50 |
| 2026-02-19 00:00 |
16:21:29.63 |
-24:25:15.4 |
HIP 80196 |
11.96 |
| 2026-02-19 12:00 |
16:21:32.10 |
-24:25:18.0 |
HIP 80196 |
11.44 |
| 2026-02-20 00:00 |
16:21:34.48 |
-24:25:20.3 |
HIP 80196 |
10.93 |
| 2026-02-20 12:00 |
16:21:36.77 |
-24:25:22.4 |
HIP 80196 |
10.45 |
| 2026-02-21 00:00 |
16:21:38.98 |
-24:25:24.4 |
HIP 80196 |
9.99 |
| 2026-02-21 12:00 |
16:21:41.11 |
-24:25:26.1 |
HIP 80196 |
9.55 |
| 2026-02-22 00:00 |
16:21:43.14 |
-24:25:27.7 |
HIP 80196 |
9.14 |
| 2026-02-22 12:00 |
16:21:45.10 |
-24:25:29.0 |
HIP 80196 |
8.74 |
| 2026-02-23 00:00 |
16:21:46.96 |
-24:25:30.2 |
HIP 80196 |
8.37 |
| 2026-02-23 12:00 |
16:21:48.74 |
-24:25:31.2 |
HIP 80196 |
8.01 |
| 2026-02-24 00:00 |
16:21:50.43 |
-24:25:31.9 |
HIP 80196 |
7.68 |