C/2019 C1 (ATLAS)
メタデータ
| 項目 |
値 |
| Designation |
C/2019 C1 (ATLAS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2020-05-05T17:23:03.788160Z |
| Orbit solution date (soln_date, UTC) |
2021-08-06T00:42:31Z |
| Obs used |
739 |
| NEO |
- |
| M1 |
6.500 |
| K1 |
9.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2019-02-05T11:02:21.926400Z |
| Discovery magnitude (MPC) |
17.75 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) |
2020-04-24.0000000 |
| e |
0.99209888 |
| q (au) |
6.581320 |
| a (au) |
832.959952 |
| i (deg) |
36.016489 |
| Ω (om, deg) |
212.397225 |
| ω (w, deg) |
319.189707 |
| M (ma, deg) |
359.999519 |
等級
散乱 + 全体線形
$$
M_a = (0.402 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
0.402 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.501 |
| 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
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
17:37:57.69 |
+03:57:17.8 |
HIP 86349 |
25.25 |
| 2026-02-03 12:00 |
17:38:04.85 |
+03:58:07.5 |
HIP 86349 |
23.78 |
| 2026-02-04 00:00 |
17:38:11.95 |
+03:58:57.5 |
HIP 86349 |
22.38 |
| 2026-02-04 12:00 |
17:38:19.01 |
+03:59:47.9 |
HIP 86349 |
21.06 |
| 2026-02-05 00:00 |
17:38:26.01 |
+04:00:38.7 |
HIP 86349 |
19.85 |
| 2026-02-05 12:00 |
17:38:32.97 |
+04:01:29.8 |
HIP 86349 |
18.76 |
| 2026-02-06 00:00 |
17:38:39.87 |
+04:02:21.3 |
HIP 86349 |
17.81 |
| 2026-02-06 12:00 |
17:38:46.72 |
+04:03:13.1 |
HIP 86349 |
17.01 |
| 2026-02-07 00:00 |
17:38:53.52 |
+04:04:05.3 |
HIP 86349 |
16.39 |
| 2026-02-07 12:00 |
17:39:00.27 |
+04:04:57.8 |
HIP 86349 |
15.97 |
| 2026-02-08 00:00 |
17:39:06.96 |
+04:05:50.6 |
HIP 86349 |
15.75 |
| 2026-02-08 12:00 |
17:39:13.60 |
+04:06:43.9 |
HIP 86349 |
15.75 |
| 2026-02-09 00:00 |
17:39:20.19 |
+04:07:37.4 |
HIP 86349 |
15.95 |
| 2026-02-09 12:00 |
17:39:26.73 |
+04:08:31.3 |
HIP 86349 |
16.36 |
| 2026-02-10 00:00 |
17:39:33.21 |
+04:09:25.5 |
HIP 86349 |
16.94 |
| 2026-02-10 12:00 |
17:39:39.63 |
+04:10:20.1 |
HIP 86511 |
16.33 |
| 2026-02-11 00:00 |
17:39:46.00 |
+04:11:15.0 |
HIP 86511 |
14.86 |
| 2026-02-11 12:00 |
17:39:52.32 |
+04:12:10.2 |
HIP 86511 |
13.48 |
| 2026-02-12 00:00 |
17:39:58.58 |
+04:13:05.7 |
HIP 86511 |
12.24 |
| 2026-02-12 12:00 |
17:40:04.78 |
+04:14:01.6 |
HIP 86511 |
11.18 |
| 2026-02-13 00:00 |
17:40:10.93 |
+04:14:57.7 |
HIP 86511 |
10.33 |
| 2026-02-13 12:00 |
17:40:17.02 |
+04:15:54.2 |
HIP 86511 |
9.76 |
| 2026-02-14 00:00 |
17:40:23.05 |
+04:16:51.0 |
HIP 86511 |
9.51 |
| 2026-02-14 12:00 |
17:40:29.03 |
+04:17:48.2 |
HIP 86511 |
9.60 |
| 2026-02-15 00:00 |
17:40:34.95 |
+04:18:45.6 |
HIP 86511 |
10.01 |
| 2026-02-15 12:00 |
17:40:40.81 |
+04:19:43.3 |
HIP 86511 |
10.71 |
| 2026-02-16 00:00 |
17:40:46.61 |
+04:20:41.4 |
HIP 86511 |
11.64 |
| 2026-02-16 12:00 |
17:40:52.35 |
+04:21:39.7 |
HIP 86511 |
12.74 |
| 2026-02-17 00:00 |
17:40:58.03 |
+04:22:38.3 |
HIP 86511 |
13.97 |
| 2026-02-17 12:00 |
17:41:03.66 |
+04:23:37.2 |
HIP 86611 |
13.11 |
| 2026-02-18 00:00 |
17:41:09.22 |
+04:24:36.4 |
HIP 86611 |
11.91 |
| 2026-02-18 12:00 |
17:41:14.73 |
+04:25:35.9 |
HIP 86611 |
10.86 |
| 2026-02-19 00:00 |
17:41:20.17 |
+04:26:35.7 |
HIP 86611 |
10.00 |
| 2026-02-19 12:00 |
17:41:25.55 |
+04:27:35.7 |
HIP 86611 |
9.39 |
| 2026-02-20 00:00 |
17:41:30.87 |
+04:28:36.0 |
HIP 86611 |
9.06 |
| 2026-02-20 12:00 |
17:41:36.13 |
+04:29:36.6 |
HIP 86611 |
9.05 |
| 2026-02-21 00:00 |
17:41:41.33 |
+04:30:37.5 |
HIP 86611 |
9.34 |
| 2026-02-21 12:00 |
17:41:46.47 |
+04:31:38.6 |
HIP 86611 |
9.91 |
| 2026-02-22 00:00 |
17:41:51.55 |
+04:32:40.0 |
HIP 86611 |
10.71 |
| 2026-02-22 12:00 |
17:41:56.56 |
+04:33:41.6 |
HIP 86611 |
11.69 |
| 2026-02-23 00:00 |
17:42:01.51 |
+04:34:43.5 |
HIP 86611 |
12.79 |
| 2026-02-23 12:00 |
17:42:06.39 |
+04:35:45.6 |
HIP 86611 |
14.00 |
| 2026-02-24 00:00 |
17:42:11.22 |
+04:36:48.0 |
HIP 86611 |
15.28 |