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 · 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) |
2023-03-06.0000000 |
| 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 |
-0.998 |
| 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 |
+26.2283 |
-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) |
| 2026-07-29 00:00 |
02:57:21.07 |
-66:59:28.6 |
HIP 13811 |
8.38 |
| 2026-07-29 12:00 |
02:57:20.15 |
-67:02:08.5 |
HIP 13811 |
10.96 |
| 2026-07-30 00:00 |
02:57:19.00 |
-67:04:48.6 |
HIP 13720 |
10.63 |
| 2026-07-30 12:00 |
02:57:17.63 |
-67:07:29.0 |
HIP 13720 |
8.12 |
| 2026-07-31 00:00 |
02:57:16.03 |
-67:10:09.6 |
HIP 13720 |
5.74 |
| 2026-07-31 12:00 |
02:57:14.20 |
-67:12:50.4 |
HIP 13720 |
3.76 |
| 2026-08-01 00:00 |
02:57:12.14 |
-67:15:31.3 |
HIP 13720 |
3.11 |
| 2026-08-01 12:00 |
02:57:09.84 |
-67:18:12.5 |
HIP 13720 |
4.42 |
| 2026-08-02 00:00 |
02:57:07.32 |
-67:20:53.8 |
HIP 13842 |
6.26 |
| 2026-08-02 12:00 |
02:57:04.55 |
-67:23:35.3 |
HIP 13842 |
6.40 |
| 2026-08-03 00:00 |
02:57:01.56 |
-67:26:17.0 |
HIP 13842 |
7.59 |
| 2026-08-03 12:00 |
02:56:58.32 |
-67:28:58.7 |
HIP 13842 |
9.45 |
| 2026-08-04 00:00 |
02:56:54.84 |
-67:31:40.6 |
HIP 13842 |
11.67 |
| 2026-08-04 12:00 |
02:56:51.12 |
-67:34:22.6 |
HIP 13842 |
14.07 |
| 2026-08-05 00:00 |
02:56:47.16 |
-67:37:04.7 |
HIP 13842 |
16.59 |
| 2026-08-05 12:00 |
02:56:42.95 |
-67:39:46.8 |
HIP 13842 |
19.18 |
| 2026-08-06 00:00 |
02:56:38.50 |
-67:42:29.0 |
HIP 13463 |
20.56 |
| 2026-08-06 12:00 |
02:56:33.80 |
-67:45:11.3 |
HIP 13463 |
19.07 |
| 2026-08-07 00:00 |
02:56:28.85 |
-67:47:53.6 |
HIP 13463 |
17.86 |
| 2026-08-07 12:00 |
02:56:23.65 |
-67:50:36.0 |
HIP 13463 |
16.99 |
| 2026-08-08 00:00 |
02:56:18.20 |
-67:53:18.3 |
HIP 13463 |
16.52 |
| 2026-08-08 12:00 |
02:56:12.49 |
-67:56:00.7 |
HIP 13463 |
16.48 |
| 2026-08-09 00:00 |
02:56:06.52 |
-67:58:43.0 |
HIP 13709 |
16.85 |
| 2026-08-09 12:00 |
02:56:00.30 |
-68:01:25.3 |
HIP 13709 |
14.28 |
| 2026-08-10 00:00 |
02:55:53.82 |
-68:04:07.6 |
HIP 13709 |
11.80 |
| 2026-08-10 12:00 |
02:55:47.09 |
-68:06:49.8 |
HIP 13709 |
9.50 |
| 2026-08-11 00:00 |
02:55:40.08 |
-68:09:31.9 |
HIP 13709 |
7.54 |
| 2026-08-11 12:00 |
02:55:32.82 |
-68:12:13.9 |
HIP 13709 |
6.25 |
| 2026-08-12 00:00 |
02:55:25.29 |
-68:14:55.8 |
HIP 13709 |
6.09 |
| 2026-08-12 12:00 |
02:55:17.50 |
-68:17:37.6 |
HIP 13709 |
7.14 |
| 2026-08-13 00:00 |
02:55:09.44 |
-68:20:19.2 |
HIP 13709 |
8.98 |
| 2026-08-13 12:00 |
02:55:01.11 |
-68:23:00.7 |
HIP 13709 |
11.24 |
| 2026-08-14 00:00 |
02:54:52.51 |
-68:25:42.0 |
HIP 13709 |
13.71 |
| 2026-08-14 12:00 |
02:54:43.64 |
-68:28:23.2 |
HIP 13777 |
14.60 |
| 2026-08-15 00:00 |
02:54:34.50 |
-68:31:04.1 |
HIP 13777 |
15.08 |
| 2026-08-15 12:00 |
02:54:25.08 |
-68:33:44.8 |
HIP 13777 |
16.07 |
| 2026-08-16 00:00 |
02:54:15.40 |
-68:36:25.2 |
HIP 13777 |
17.48 |
| 2026-08-16 12:00 |
02:54:05.44 |
-68:39:05.4 |
HIP 13777 |
19.22 |
| 2026-08-17 00:00 |
02:53:55.20 |
-68:41:45.4 |
HIP 13742 |
19.84 |
| 2026-08-17 12:00 |
02:53:44.68 |
-68:44:25.0 |
HIP 13742 |
19.29 |
| 2026-08-18 00:00 |
02:53:33.89 |
-68:47:04.4 |
HIP 13742 |
19.15 |
| 2026-08-18 12:00 |
02:53:22.82 |
-68:49:43.4 |
HIP 13742 |
19.46 |
| 2026-08-19 00:00 |
02:53:11.47 |
-68:52:22.1 |
HIP 13742 |
20.18 |