メタデータ
| 項目 |
値 |
| Designation |
C/2023 E1 (ATLAS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2023-07-01T02:34:44.604480Z |
| Orbit solution date (soln_date, UTC) |
2024-02-17T03:13:27Z |
| Obs used |
3004 |
| NEO |
Yes |
| M1 |
16.200 |
| K1 |
7.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2023-03-01T00:05:50.179200Z |
| Discovery magnitude (MPC) |
18.82 o |
| Discovery observatory (MPC) |
M22 · ATLAS South Africa, Sutherland |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2023-07-02.0000000 |
| e |
0.94690275 |
| q (au) |
1.026605 |
| a (au) |
19.334429 |
| i (deg) |
38.312983 |
| Ω (om, deg) |
164.574212 |
| ω (w, deg) |
105.894615 |
| M (ma, deg) |
0.010347 |
等級
散乱 + 全体線形
$$
M_a = (15.216 + 5.450\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
15.216 |
| n |
5.450 |
| gf |
0.997 |
| gb |
-0.697 |
| k |
0.942 |
| 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 |
| 2022-12-25 |
2023-06-30 |
+7.6115 |
-1.812 |
| 2023-07-01 |
2023-12-11 |
-0.5124 |
-1.544 |
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) |
| 2026-07-29 00:00 |
04:23:26.99 |
-14:16:32.3 |
HIP 20521 |
16.70 |
| 2026-07-29 12:00 |
04:23:34.16 |
-14:17:45.4 |
HIP 20521 |
17.35 |
| 2026-07-30 00:00 |
04:23:41.25 |
-14:18:59.0 |
HIP 20521 |
18.23 |
| 2026-07-30 12:00 |
04:23:48.26 |
-14:20:13.2 |
HIP 20581 |
19.27 |
| 2026-07-31 00:00 |
04:23:55.20 |
-14:21:28.1 |
HIP 20581 |
17.35 |
| 2026-07-31 12:00 |
04:24:02.06 |
-14:22:43.6 |
HIP 20581 |
15.47 |
| 2026-08-01 00:00 |
04:24:08.84 |
-14:23:59.7 |
HIP 20581 |
13.65 |
| 2026-08-01 12:00 |
04:24:15.55 |
-14:25:16.4 |
HIP 20581 |
11.90 |
| 2026-08-02 00:00 |
04:24:22.17 |
-14:26:33.6 |
HIP 20581 |
10.27 |
| 2026-08-02 12:00 |
04:24:28.72 |
-14:27:51.5 |
HIP 20581 |
8.82 |
| 2026-08-03 00:00 |
04:24:35.19 |
-14:29:10.0 |
HIP 20581 |
7.62 |
| 2026-08-03 12:00 |
04:24:41.58 |
-14:30:29.0 |
HIP 20581 |
6.83 |
| 2026-08-04 00:00 |
04:24:47.89 |
-14:31:48.7 |
HIP 20581 |
6.56 |
| 2026-08-04 12:00 |
04:24:54.12 |
-14:33:08.9 |
HIP 20581 |
6.88 |
| 2026-08-05 00:00 |
04:25:00.27 |
-14:34:29.7 |
HIP 20581 |
7.71 |
| 2026-08-05 12:00 |
04:25:06.34 |
-14:35:51.1 |
HIP 20581 |
8.90 |
| 2026-08-06 00:00 |
04:25:12.33 |
-14:37:13.1 |
HIP 20581 |
10.33 |
| 2026-08-06 12:00 |
04:25:18.23 |
-14:38:35.6 |
HIP 20581 |
11.90 |
| 2026-08-07 00:00 |
04:25:24.06 |
-14:39:58.7 |
HIP 20581 |
13.56 |
| 2026-08-07 12:00 |
04:25:29.79 |
-14:41:22.3 |
HIP 20581 |
15.28 |
| 2026-08-08 00:00 |
04:25:35.45 |
-14:42:46.5 |
HIP 20581 |
17.04 |
| 2026-08-08 12:00 |
04:25:41.02 |
-14:44:11.3 |
HIP 20749 |
17.30 |
| 2026-08-09 00:00 |
04:25:46.51 |
-14:45:36.6 |
HIP 20749 |
16.76 |
| 2026-08-09 12:00 |
04:25:51.91 |
-14:47:02.5 |
HIP 20749 |
16.44 |
| 2026-08-10 00:00 |
04:25:57.23 |
-14:48:28.8 |
HIP 20749 |
16.38 |
| 2026-08-10 12:00 |
04:26:02.46 |
-14:49:55.8 |
HIP 20749 |
16.56 |
| 2026-08-11 00:00 |
04:26:07.60 |
-14:51:23.2 |
HIP 20749 |
16.98 |
| 2026-08-11 12:00 |
04:26:12.66 |
-14:52:51.2 |
HIP 20749 |
17.61 |
| 2026-08-12 00:00 |
04:26:17.63 |
-14:54:19.7 |
HIP 20749 |
18.44 |
| 2026-08-12 12:00 |
04:26:22.51 |
-14:55:48.7 |
HIP 20749 |
19.44 |
| 2026-08-13 00:00 |
04:26:27.30 |
-14:57:18.2 |
HIP 20749 |
20.57 |
| 2026-08-13 12:00 |
04:26:32.01 |
-14:58:48.2 |
HIP 20749 |
21.82 |
| 2026-08-14 00:00 |
04:26:36.62 |
-15:00:18.7 |
HIP 20749 |
23.17 |
| 2026-08-14 12:00 |
04:26:41.15 |
-15:01:49.7 |
HIP 20854 |
22.63 |
| 2026-08-15 00:00 |
04:26:45.59 |
-15:03:21.1 |
HIP 20854 |
21.06 |
| 2026-08-15 12:00 |
04:26:49.93 |
-15:04:53.1 |
HIP 20854 |
19.57 |
| 2026-08-16 00:00 |
04:26:54.19 |
-15:06:25.5 |
HIP 20854 |
18.15 |
| 2026-08-16 12:00 |
04:26:58.36 |
-15:07:58.4 |
HIP 20854 |
16.85 |
| 2026-08-17 00:00 |
04:27:02.43 |
-15:09:31.7 |
HIP 20854 |
15.68 |
| 2026-08-17 12:00 |
04:27:06.42 |
-15:11:05.5 |
HIP 20854 |
14.66 |
| 2026-08-18 00:00 |
04:27:10.31 |
-15:12:39.7 |
HIP 20854 |
13.84 |
| 2026-08-18 12:00 |
04:27:14.11 |
-15:14:14.4 |
HIP 20854 |
13.25 |
| 2026-08-19 00:00 |
04:27:17.82 |
-15:15:49.5 |
HIP 20854 |
12.91 |