メタデータ
| 項目 |
値 |
| Designation |
C/2022 A3 (Lemmon-ATLAS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2023-09-28T20:10:26.535360Z |
| Orbit solution date (soln_date, UTC) |
2024-10-31T13:12:14Z |
| Obs used |
1015 |
| NEO |
- |
| M1 |
8.600 |
| K1 |
9.250 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2022-01-10T10:14:36.297600Z |
| Discovery magnitude (MPC) |
20.34 G |
| Discovery observatory (MPC) |
G96 · University of Arizona Mt. Lemmon Survey |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2023-02-25.0000000 |
| e |
0.99596960 |
| q (au) |
3.703462 |
| a (au) |
918.881737 |
| i (deg) |
88.348087 |
| Ω (om, deg) |
325.483203 |
| ω (w, deg) |
234.846313 |
| M (ma, deg) |
359.992363 |
等級
散乱 + 全体線形
$$
M_a = (9.660 + 4.723\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
9.660 |
| n |
4.723 |
| gf |
1.000 |
| gb |
-0.731 |
| k |
0.800 |
| 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 |
| 2021-04-30 |
2023-06-11 |
+0.7727 |
-0.638 |
| 2023-10-09 |
2024-10-29 |
-5.2480 |
+3.736 |
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 |
22:44:57.93 |
-38:06:00.4 |
HIP 112384 |
8.77 |
| 2026-07-29 12:00 |
22:44:41.15 |
-38:06:56.1 |
HIP 112384 |
12.16 |
| 2026-07-30 00:00 |
22:44:24.28 |
-38:07:51.2 |
HIP 112384 |
15.58 |
| 2026-07-30 12:00 |
22:44:07.34 |
-38:08:45.8 |
HIP 112384 |
19.02 |
| 2026-07-31 00:00 |
22:43:50.31 |
-38:09:39.7 |
HIP 112384 |
22.48 |
| 2026-07-31 12:00 |
22:43:33.20 |
-38:10:33.0 |
HIP 112059 |
21.34 |
| 2026-08-01 00:00 |
22:43:16.01 |
-38:11:25.7 |
HIP 112059 |
18.50 |
| 2026-08-01 12:00 |
22:42:58.74 |
-38:12:17.7 |
HIP 112059 |
15.90 |
| 2026-08-02 00:00 |
22:42:41.40 |
-38:13:09.1 |
HIP 112059 |
13.69 |
| 2026-08-02 12:00 |
22:42:23.98 |
-38:13:59.8 |
HIP 112059 |
12.10 |
| 2026-08-03 00:00 |
22:42:06.49 |
-38:14:49.8 |
HIP 112059 |
11.41 |
| 2026-08-03 12:00 |
22:41:48.93 |
-38:15:39.2 |
HIP 112059 |
11.77 |
| 2026-08-04 00:00 |
22:41:31.30 |
-38:16:27.9 |
HIP 112059 |
13.11 |
| 2026-08-04 12:00 |
22:41:13.60 |
-38:17:15.8 |
HIP 112059 |
15.18 |
| 2026-08-05 00:00 |
22:40:55.83 |
-38:18:03.1 |
HIP 112059 |
17.73 |
| 2026-08-05 12:00 |
22:40:38.00 |
-38:18:49.6 |
HIP 112059 |
20.59 |
| 2026-08-06 00:00 |
22:40:20.11 |
-38:19:35.4 |
HIP 111815 |
18.87 |
| 2026-08-06 12:00 |
22:40:02.15 |
-38:20:20.4 |
HIP 111815 |
15.45 |
| 2026-08-07 00:00 |
22:39:44.13 |
-38:21:04.7 |
HIP 111815 |
12.14 |
| 2026-08-07 12:00 |
22:39:26.05 |
-38:21:48.2 |
HIP 111815 |
9.07 |
| 2026-08-08 00:00 |
22:39:07.91 |
-38:22:30.9 |
HIP 111815 |
6.58 |
| 2026-08-08 12:00 |
22:38:49.72 |
-38:23:12.8 |
HIP 111815 |
5.55 |
| 2026-08-09 00:00 |
22:38:31.48 |
-38:23:54.0 |
HIP 111815 |
6.69 |
| 2026-08-09 12:00 |
22:38:13.18 |
-38:24:34.3 |
HIP 111815 |
9.25 |
| 2026-08-10 00:00 |
22:37:54.83 |
-38:25:13.8 |
HIP 111815 |
12.38 |
| 2026-08-10 12:00 |
22:37:36.43 |
-38:25:52.4 |
HIP 111815 |
15.75 |
| 2026-08-11 00:00 |
22:37:17.99 |
-38:26:30.2 |
HIP 111815 |
19.23 |
| 2026-08-11 12:00 |
22:36:59.50 |
-38:27:07.2 |
HIP 111507 |
17.89 |
| 2026-08-12 00:00 |
22:36:40.97 |
-38:27:43.3 |
HIP 111507 |
14.33 |
| 2026-08-12 12:00 |
22:36:22.39 |
-38:28:18.5 |
HIP 111507 |
10.84 |
| 2026-08-13 00:00 |
22:36:03.78 |
-38:28:52.9 |
HIP 111507 |
7.52 |
| 2026-08-13 12:00 |
22:35:45.13 |
-38:29:26.3 |
HIP 111507 |
4.77 |
| 2026-08-14 00:00 |
22:35:26.44 |
-38:29:58.9 |
HIP 111507 |
4.02 |
| 2026-08-14 12:00 |
22:35:07.72 |
-38:30:30.5 |
HIP 111507 |
6.06 |
| 2026-08-15 00:00 |
22:34:48.97 |
-38:31:01.3 |
HIP 111507 |
9.21 |
| 2026-08-15 12:00 |
22:34:30.19 |
-38:31:31.1 |
HIP 111419 |
10.85 |
| 2026-08-16 00:00 |
22:34:11.38 |
-38:32:00.0 |
HIP 111419 |
11.57 |
| 2026-08-16 12:00 |
22:33:52.55 |
-38:32:27.9 |
HIP 111419 |
13.32 |
| 2026-08-17 00:00 |
22:33:33.69 |
-38:32:54.8 |
HIP 111419 |
15.75 |
| 2026-08-17 12:00 |
22:33:14.81 |
-38:33:20.9 |
HIP 111419 |
18.61 |
| 2026-08-18 00:00 |
22:32:55.91 |
-38:33:45.9 |
HIP 111419 |
21.72 |
| 2026-08-18 12:00 |
22:32:36.99 |
-38:34:10.0 |
HIP 111144 |
20.58 |
| 2026-08-19 00:00 |
22:32:18.05 |
-38:34:33.1 |
HIP 111144 |
17.58 |