メタデータ
| 項目 |
値 |
| Designation |
C/2022 W3 (Leonard) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2023-06-22T18:37:13.267200Z |
| Orbit solution date (soln_date, UTC) |
2024-02-01T00:43:16Z |
| Obs used |
876 |
| NEO |
- |
| M1 |
15.600 |
| K1 |
4.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2022-11-26T11:27:43.689600Z |
| Discovery magnitude (MPC) |
19.72 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) |
2023-05-23.0000000 |
| e |
0.99503341 |
| q (au) |
1.397698 |
| a (au) |
281.420082 |
| i (deg) |
103.558036 |
| Ω (om, deg) |
132.268653 |
| ω (w, deg) |
116.521323 |
| M (ma, deg) |
359.993575 |
等級
散乱 + 全体線形
$$
M_a = (15.045 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
15.045 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
0.992 |
| 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 |
| 2022-11-13 |
2022-12-26 |
+10.0116 |
-4.536 |
| 2022-12-26 |
2023-02-14 |
+14.3184 |
-6.086 |
| 2023-02-14 |
2023-06-22 |
+4.7617 |
-2.428 |
| 2023-06-24 |
2023-09-10 |
+9.8993 |
-1.871 |
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) |
| 2026-06-01 00:00 |
04:22:23.20 |
-81:51:20.6 |
HIP 20382 |
4.71 |
| 2026-06-01 12:00 |
04:23:56.90 |
-81:51:30.3 |
HIP 20382 |
6.48 |
| 2026-06-02 00:00 |
04:25:30.59 |
-81:51:40.1 |
HIP 20382 |
9.17 |
| 2026-06-02 12:00 |
04:27:04.27 |
-81:51:50.1 |
HIP 20382 |
12.18 |
| 2026-06-03 00:00 |
04:28:37.92 |
-81:52:00.1 |
HIP 20382 |
15.32 |
| 2026-06-03 12:00 |
04:30:11.56 |
-81:52:10.1 |
HIP 20382 |
18.53 |
| 2026-06-04 00:00 |
04:31:45.18 |
-81:52:20.3 |
HIP 20382 |
21.78 |
| 2026-06-04 12:00 |
04:33:18.79 |
-81:52:30.6 |
HIP 20382 |
25.04 |
| 2026-06-05 00:00 |
04:34:52.37 |
-81:52:40.9 |
HIP 20382 |
28.32 |
| 2026-06-05 12:00 |
04:36:25.93 |
-81:52:51.3 |
HIP 21945 |
26.72 |
| 2026-06-06 00:00 |
04:37:59.47 |
-81:53:01.8 |
HIP 21945 |
25.23 |
| 2026-06-06 12:00 |
04:39:32.98 |
-81:53:12.4 |
HIP 21945 |
24.14 |
| 2026-06-07 00:00 |
04:41:06.47 |
-81:53:23.1 |
HIP 22518 |
21.93 |
| 2026-06-07 12:00 |
04:42:39.94 |
-81:53:33.9 |
HIP 22518 |
18.88 |
| 2026-06-08 00:00 |
04:44:13.38 |
-81:53:44.8 |
HIP 22518 |
15.93 |
| 2026-06-08 12:00 |
04:45:46.79 |
-81:53:55.7 |
HIP 22518 |
13.12 |
| 2026-06-09 00:00 |
04:47:20.17 |
-81:54:06.8 |
HIP 22518 |
10.59 |
| 2026-06-09 12:00 |
04:48:53.51 |
-81:54:17.9 |
HIP 22518 |
8.57 |
| 2026-06-10 00:00 |
04:50:26.83 |
-81:54:29.2 |
HIP 22518 |
7.49 |
| 2026-06-10 12:00 |
04:52:00.12 |
-81:54:40.5 |
HIP 22518 |
7.75 |
| 2026-06-11 00:00 |
04:53:33.37 |
-81:54:51.9 |
HIP 22518 |
9.23 |
| 2026-06-11 12:00 |
04:55:06.58 |
-81:55:03.4 |
HIP 22518 |
11.47 |
| 2026-06-12 00:00 |
04:56:39.75 |
-81:55:15.1 |
HIP 22518 |
14.11 |
| 2026-06-12 12:00 |
04:58:12.89 |
-81:55:26.8 |
HIP 22518 |
16.96 |
| 2026-06-13 00:00 |
04:59:45.98 |
-81:55:38.6 |
HIP 22518 |
19.93 |
| 2026-06-13 12:00 |
05:01:19.03 |
-81:55:50.5 |
HIP 22518 |
22.97 |
| 2026-06-14 00:00 |
05:02:52.04 |
-81:56:02.5 |
HIP 22518 |
26.06 |
| 2026-06-14 12:00 |
05:04:25.00 |
-81:56:14.6 |
HIP 22518 |
29.18 |
| 2026-06-15 00:00 |
05:05:57.91 |
-81:56:26.9 |
HIP 24256 |
27.69 |
| 2026-06-15 12:00 |
05:07:30.77 |
-81:56:39.2 |
HIP 24256 |
26.36 |
| 2026-06-16 00:00 |
05:09:03.58 |
-81:56:51.6 |
HIP 24256 |
25.41 |
| 2026-06-16 12:00 |
05:10:36.33 |
-81:57:04.2 |
HIP 24256 |
24.87 |
| 2026-06-17 00:00 |
05:12:09.03 |
-81:57:16.8 |
HIP 24256 |
24.78 |
| 2026-06-17 12:00 |
05:13:41.68 |
-81:57:29.6 |
HIP 24276 |
24.70 |
| 2026-06-18 00:00 |
05:15:14.26 |
-81:57:42.5 |
HIP 24276 |
24.98 |
| 2026-06-18 12:00 |
05:16:46.78 |
-81:57:55.4 |
HIP 24276 |
25.64 |
| 2026-06-19 00:00 |
05:18:19.24 |
-81:58:08.5 |
HIP 25612 |
24.19 |
| 2026-06-19 12:00 |
05:19:51.63 |
-81:58:21.7 |
HIP 25612 |
21.50 |
| 2026-06-20 00:00 |
05:21:23.96 |
-81:58:35.0 |
HIP 25612 |
19.01 |
| 2026-06-20 12:00 |
05:22:56.23 |
-81:58:48.4 |
HIP 25612 |
16.79 |
| 2026-06-21 00:00 |
05:24:28.42 |
-81:59:01.9 |
HIP 25612 |
14.97 |
| 2026-06-21 12:00 |
05:26:00.55 |
-81:59:15.5 |
HIP 25612 |
13.69 |
| 2026-06-22 00:00 |
05:27:32.60 |
-81:59:29.2 |
HIP 25612 |
13.13 |