C/2023 A1 (Leonard)
メタデータ
| 項目 |
値 |
| Designation |
C/2023 A1 (Leonard) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2023-03-18T17:25:38.349120Z |
| Orbit solution date (soln_date, UTC) |
2024-04-13T16:42:45Z |
| Obs used |
453 |
| NEO |
- |
| M1 |
6.300 |
| K1 |
37.000 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2023-01-09T12:59:03.782400Z |
| Discovery magnitude (MPC) |
18.94 G |
| Discovery observatory (MPC) |
G96 · Mt. Lemmon Survey |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2023-03-06.0000000 |
| e |
0.99200431 |
| q (au) |
1.834725 |
| a (au) |
229.464077 |
| i (deg) |
94.743121 |
| Ω (om, deg) |
318.307926 |
| ω (w, deg) |
159.249397 |
| M (ma, deg) |
359.996391 |
等級
散乱 + 全体線形
$$
M_a = (11.463 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
11.463 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.502 |
| 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
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) |
終了日 (UTC) |
a |
b |
| 2022-12-15 |
2023-03-18 |
+26.2284 |
-7.251 |
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) |
| 2026-02-03 00:00 |
01:41:07.15 |
-67:29:33.5 |
HIP 7869 |
11.01 |
| 2026-02-03 12:00 |
01:41:10.70 |
-67:26:34.7 |
HIP 7806 |
13.42 |
| 2026-02-04 00:00 |
01:41:14.46 |
-67:23:36.5 |
HIP 7806 |
10.83 |
| 2026-02-04 12:00 |
01:41:18.45 |
-67:20:38.7 |
HIP 7806 |
8.53 |
| 2026-02-05 00:00 |
01:41:22.65 |
-67:17:41.4 |
HIP 7806 |
6.80 |
| 2026-02-05 12:00 |
01:41:27.07 |
-67:14:44.7 |
HIP 7806 |
6.16 |
| 2026-02-06 00:00 |
01:41:31.69 |
-67:11:48.4 |
HIP 7806 |
6.89 |
| 2026-02-06 12:00 |
01:41:36.53 |
-67:08:52.7 |
HIP 7806 |
8.66 |
| 2026-02-07 00:00 |
01:41:41.57 |
-67:05:57.5 |
HIP 7806 |
10.97 |
| 2026-02-07 12:00 |
01:41:46.82 |
-67:03:02.8 |
HIP 7973 |
13.06 |
| 2026-02-08 00:00 |
01:41:52.27 |
-67:00:08.8 |
HIP 7973 |
10.13 |
| 2026-02-08 12:00 |
01:41:57.92 |
-66:57:15.2 |
HIP 7973 |
7.23 |
| 2026-02-09 00:00 |
01:42:03.78 |
-66:54:22.3 |
HIP 7973 |
4.38 |
| 2026-02-09 12:00 |
01:42:09.82 |
-66:51:29.9 |
HIP 7973 |
1.83 |
| 2026-02-10 00:00 |
01:42:16.07 |
-66:48:38.1 |
HIP 7973 |
2.15 |
| 2026-02-10 12:00 |
01:42:22.50 |
-66:45:46.9 |
HIP 7973 |
4.79 |
| 2026-02-11 00:00 |
01:42:29.13 |
-66:42:56.3 |
HIP 8027 |
4.34 |
| 2026-02-11 12:00 |
01:42:35.95 |
-66:40:06.4 |
HIP 8027 |
2.96 |
| 2026-02-12 00:00 |
01:42:42.95 |
-66:37:17.0 |
HIP 8027 |
3.94 |
| 2026-02-12 12:00 |
01:42:50.14 |
-66:34:28.3 |
HIP 8027 |
6.24 |
| 2026-02-13 00:00 |
01:42:57.51 |
-66:31:40.3 |
HIP 8027 |
8.89 |
| 2026-02-13 12:00 |
01:43:05.06 |
-66:28:52.9 |
HIP 8027 |
11.64 |
| 2026-02-14 00:00 |
01:43:12.80 |
-66:26:06.1 |
HIP 8027 |
14.44 |
| 2026-02-14 12:00 |
01:43:20.71 |
-66:23:20.1 |
HIP 8027 |
17.25 |
| 2026-02-15 00:00 |
01:43:28.79 |
-66:20:34.7 |
HIP 8027 |
20.08 |
| 2026-02-15 12:00 |
01:43:37.05 |
-66:17:50.0 |
HIP 7954 |
19.03 |
| 2026-02-16 00:00 |
01:43:45.48 |
-66:15:06.0 |
HIP 7954 |
17.14 |
| 2026-02-16 12:00 |
01:43:54.08 |
-66:12:22.7 |
HIP 7954 |
15.59 |
| 2026-02-17 00:00 |
01:44:02.85 |
-66:09:40.1 |
HIP 7954 |
14.46 |
| 2026-02-17 12:00 |
01:44:11.78 |
-66:06:58.3 |
HIP 7954 |
13.86 |
| 2026-02-18 00:00 |
01:44:20.88 |
-66:04:17.1 |
HIP 7954 |
13.85 |
| 2026-02-18 12:00 |
01:44:30.14 |
-66:01:36.8 |
HIP 7954 |
14.43 |
| 2026-02-19 00:00 |
01:44:39.56 |
-65:58:57.1 |
HIP 7954 |
15.53 |
| 2026-02-19 12:00 |
01:44:49.14 |
-65:56:18.2 |
HIP 7954 |
17.06 |
| 2026-02-20 00:00 |
01:44:58.87 |
-65:53:40.1 |
HIP 7954 |
18.89 |
| 2026-02-20 12:00 |
01:45:08.76 |
-65:51:02.8 |
HIP 7954 |
20.95 |
| 2026-02-21 00:00 |
01:45:18.80 |
-65:48:26.2 |
HIP 7954 |
23.19 |
| 2026-02-21 12:00 |
01:45:28.99 |
-65:45:50.5 |
HIP 7954 |
25.54 |
| 2026-02-22 00:00 |
01:45:39.33 |
-65:43:15.5 |
HIP 7954 |
27.97 |
| 2026-02-22 12:00 |
01:45:49.82 |
-65:40:41.3 |
HIP 7954 |
30.48 |
| 2026-02-23 00:00 |
01:46:00.45 |
-65:38:08.0 |
HIP 7954 |
33.03 |
| 2026-02-23 12:00 |
01:46:11.23 |
-65:35:35.4 |
HIP 7954 |
35.62 |
| 2026-02-24 00:00 |
01:46:22.14 |
-65:33:03.7 |
HIP 7954 |
38.24 |