メタデータ
| 項目 |
値 |
| Designation |
C/2023 S2 (ATLAS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2023-10-15T09:03:22.020480Z |
| Orbit solution date (soln_date, UTC) |
2024-06-06T23:12:32Z |
| Obs used |
392 |
| NEO |
- |
| M1 |
14.500 |
| K1 |
25.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2023-09-28T23:40:21.590400Z |
| Discovery magnitude (MPC) |
15.15 o |
| Discovery observatory (MPC) |
W68 · ATLAS Chile, Rio Hurtado |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2023-10-11.0000000 |
| e |
0.99288676 |
| q (au) |
1.067716 |
| a (au) |
150.102592 |
| i (deg) |
20.485436 |
| Ω (om, deg) |
230.562176 |
| ω (w, deg) |
78.109160 |
| M (ma, deg) |
359.997654 |
等級
散乱 + 全体線形
$$
M_a = (14.113 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
14.113 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.500 |
| 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) |
| 2026-05-12 00:00 |
05:39:13.05 |
+11:43:23.2 |
HIP 26609 |
7.21 |
| 2026-05-12 12:00 |
05:39:24.56 |
+11:43:40.3 |
HIP 26609 |
6.43 |
| 2026-05-13 00:00 |
05:39:36.10 |
+11:43:57.2 |
HIP 26609 |
6.83 |
| 2026-05-13 12:00 |
05:39:47.68 |
+11:44:13.7 |
HIP 26609 |
8.27 |
| 2026-05-14 00:00 |
05:39:59.29 |
+11:44:30.0 |
HIP 26609 |
10.31 |
| 2026-05-14 12:00 |
05:40:10.94 |
+11:44:46.0 |
HIP 26609 |
12.69 |
| 2026-05-15 00:00 |
05:40:22.63 |
+11:45:01.8 |
HIP 26609 |
15.24 |
| 2026-05-15 12:00 |
05:40:34.35 |
+11:45:17.2 |
HIP 26609 |
17.90 |
| 2026-05-16 00:00 |
05:40:46.10 |
+11:45:32.4 |
HIP 26609 |
20.63 |
| 2026-05-16 12:00 |
05:40:57.89 |
+11:45:47.3 |
HIP 26609 |
23.40 |
| 2026-05-17 00:00 |
05:41:09.71 |
+11:46:01.9 |
HIP 26609 |
26.21 |
| 2026-05-17 12:00 |
05:41:21.56 |
+11:46:16.3 |
HIP 26609 |
29.05 |
| 2026-05-18 00:00 |
05:41:33.44 |
+11:46:30.3 |
HIP 26676 |
31.72 |
| 2026-05-18 12:00 |
05:41:45.35 |
+11:46:44.1 |
HIP 26676 |
33.51 |
| 2026-05-19 00:00 |
05:41:57.29 |
+11:46:57.6 |
HIP 26676 |
35.46 |
| 2026-05-19 12:00 |
05:42:09.26 |
+11:47:10.8 |
HIP 27020 |
33.82 |
| 2026-05-20 00:00 |
05:42:21.26 |
+11:47:23.8 |
HIP 27020 |
31.87 |
| 2026-05-20 12:00 |
05:42:33.28 |
+11:47:36.4 |
HIP 27020 |
30.07 |
| 2026-05-21 00:00 |
05:42:45.33 |
+11:47:48.8 |
HIP 27020 |
28.46 |
| 2026-05-21 12:00 |
05:42:57.41 |
+11:48:00.8 |
HIP 27020 |
27.08 |
| 2026-05-22 00:00 |
05:43:09.52 |
+11:48:12.6 |
HIP 27020 |
25.95 |
| 2026-05-22 12:00 |
05:43:21.65 |
+11:48:24.1 |
HIP 27020 |
25.12 |
| 2026-05-23 00:00 |
05:43:33.80 |
+11:48:35.3 |
HIP 27020 |
24.61 |
| 2026-05-23 12:00 |
05:43:45.97 |
+11:48:46.2 |
HIP 27020 |
24.46 |
| 2026-05-24 00:00 |
05:43:58.17 |
+11:48:56.8 |
HIP 27020 |
24.67 |
| 2026-05-24 12:00 |
05:44:10.40 |
+11:49:07.1 |
HIP 27020 |
25.23 |
| 2026-05-25 00:00 |
05:44:22.64 |
+11:49:17.2 |
HIP 27125 |
23.84 |
| 2026-05-25 12:00 |
05:44:34.90 |
+11:49:26.9 |
HIP 27125 |
22.45 |
| 2026-05-26 00:00 |
05:44:47.19 |
+11:49:36.4 |
HIP 27125 |
21.40 |
| 2026-05-26 12:00 |
05:44:59.50 |
+11:49:45.5 |
HIP 27125 |
20.74 |
| 2026-05-27 00:00 |
05:45:11.82 |
+11:49:54.4 |
HIP 27125 |
20.52 |
| 2026-05-27 12:00 |
05:45:24.17 |
+11:50:03.0 |
HIP 27125 |
20.74 |
| 2026-05-28 00:00 |
05:45:36.53 |
+11:50:11.3 |
HIP 27125 |
21.40 |
| 2026-05-28 12:00 |
05:45:48.91 |
+11:50:19.2 |
HIP 27125 |
22.45 |
| 2026-05-29 00:00 |
05:46:01.31 |
+11:50:26.9 |
HIP 27125 |
23.85 |
| 2026-05-29 12:00 |
05:46:13.72 |
+11:50:34.3 |
HIP 27125 |
25.55 |
| 2026-05-30 00:00 |
05:46:26.15 |
+11:50:41.4 |
HIP 27125 |
27.48 |
| 2026-05-30 12:00 |
05:46:38.60 |
+11:50:48.2 |
HIP 27125 |
29.60 |
| 2026-05-31 00:00 |
05:46:51.06 |
+11:50:54.7 |
HIP 27453 |
29.80 |
| 2026-05-31 12:00 |
05:47:03.53 |
+11:51:01.0 |
HIP 27453 |
26.87 |
| 2026-06-01 00:00 |
05:47:16.02 |
+11:51:06.9 |
HIP 27453 |
23.97 |
| 2026-06-01 12:00 |
05:47:28.53 |
+11:51:12.5 |
HIP 27453 |
21.11 |
| 2026-06-02 00:00 |
05:47:41.04 |
+11:51:17.8 |
HIP 27453 |
18.32 |