メタデータ
| 項目 |
値 |
| Designation |
C/2009 S3 (Lemmon) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2011-12-11T06:01:00.886080Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:34Z |
| Obs used |
278 |
| NEO |
- |
| M1 |
11.700 |
| K1 |
4.500 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2011-11-26.0000000 |
| e |
1.00141917 |
| q (au) |
6.474515 |
| a (au) |
-4562.197370 |
| i (deg) |
60.384601 |
| Ω (om, deg) |
225.132530 |
| ω (w, deg) |
129.760860 |
| M (ma, deg) |
-0.000049 |
等級
散乱 + 全体線形
$$
M_a = (3.800 + 4.919\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
3.800 |
| n |
4.919 |
| gf |
0.939 |
| gb |
-0.998 |
| k |
1.000 |
| δ90 |
9.737 |
| 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
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-05-12 00:00 |
06:26:47.65 |
-31:46:42.6 |
HIP 30680 |
5.62 |
| 2026-05-12 12:00 |
06:26:51.54 |
-31:46:12.5 |
HIP 30680 |
6.12 |
| 2026-05-13 00:00 |
06:26:55.47 |
-31:45:42.7 |
HIP 30680 |
6.72 |
| 2026-05-13 12:00 |
06:26:59.41 |
-31:45:13.2 |
HIP 30680 |
7.39 |
| 2026-05-14 00:00 |
06:27:03.39 |
-31:44:44.0 |
HIP 30680 |
8.12 |
| 2026-05-14 12:00 |
06:27:07.39 |
-31:44:15.2 |
HIP 30680 |
8.90 |
| 2026-05-15 00:00 |
06:27:11.42 |
-31:43:46.7 |
HIP 30680 |
9.71 |
| 2026-05-15 12:00 |
06:27:15.47 |
-31:43:18.5 |
HIP 30680 |
10.55 |
| 2026-05-16 00:00 |
06:27:19.55 |
-31:42:50.7 |
HIP 30680 |
11.40 |
| 2026-05-16 12:00 |
06:27:23.66 |
-31:42:23.1 |
HIP 30680 |
12.28 |
| 2026-05-17 00:00 |
06:27:27.78 |
-31:41:56.0 |
HIP 30680 |
13.17 |
| 2026-05-17 12:00 |
06:27:31.94 |
-31:41:29.1 |
HIP 30680 |
14.07 |
| 2026-05-18 00:00 |
06:27:36.11 |
-31:41:02.6 |
HIP 30680 |
14.98 |
| 2026-05-18 12:00 |
06:27:40.31 |
-31:40:36.5 |
HIP 30680 |
15.90 |
| 2026-05-19 00:00 |
06:27:44.54 |
-31:40:10.6 |
HIP 30680 |
16.83 |
| 2026-05-19 12:00 |
06:27:48.79 |
-31:39:45.2 |
HIP 30680 |
17.77 |
| 2026-05-20 00:00 |
06:27:53.06 |
-31:39:20.0 |
HIP 30680 |
18.71 |
| 2026-05-20 12:00 |
06:27:57.35 |
-31:38:55.3 |
HIP 30680 |
19.66 |
| 2026-05-21 00:00 |
06:28:01.66 |
-31:38:30.8 |
HIP 30680 |
20.61 |
| 2026-05-21 12:00 |
06:28:06.00 |
-31:38:06.8 |
HIP 30680 |
21.56 |
| 2026-05-22 00:00 |
06:28:10.36 |
-31:37:43.0 |
HIP 30680 |
22.52 |
| 2026-05-22 12:00 |
06:28:14.74 |
-31:37:19.7 |
HIP 30680 |
23.49 |
| 2026-05-23 00:00 |
06:28:19.14 |
-31:36:56.7 |
HIP 30680 |
24.46 |
| 2026-05-23 12:00 |
06:28:23.56 |
-31:36:34.0 |
HIP 30680 |
25.43 |
| 2026-05-24 00:00 |
06:28:28.01 |
-31:36:11.7 |
HIP 30680 |
26.40 |
| 2026-05-24 12:00 |
06:28:32.47 |
-31:35:49.7 |
HIP 30680 |
27.38 |
| 2026-05-25 00:00 |
06:28:36.96 |
-31:35:28.2 |
HIP 30680 |
28.36 |
| 2026-05-25 12:00 |
06:28:41.46 |
-31:35:06.9 |
HIP 30680 |
29.34 |
| 2026-05-26 00:00 |
06:28:45.98 |
-31:34:46.1 |
HIP 30967 |
29.06 |
| 2026-05-26 12:00 |
06:28:50.52 |
-31:34:25.6 |
HIP 30967 |
28.25 |
| 2026-05-27 00:00 |
06:28:55.08 |
-31:34:05.4 |
HIP 30967 |
27.45 |
| 2026-05-27 12:00 |
06:28:59.66 |
-31:33:45.7 |
HIP 30967 |
26.68 |
| 2026-05-28 00:00 |
06:29:04.26 |
-31:33:26.3 |
HIP 30967 |
25.93 |
| 2026-05-28 12:00 |
06:29:08.88 |
-31:33:07.2 |
HIP 30967 |
25.20 |
| 2026-05-29 00:00 |
06:29:13.51 |
-31:32:48.6 |
HIP 30967 |
24.50 |
| 2026-05-29 12:00 |
06:29:18.16 |
-31:32:30.3 |
HIP 30967 |
23.83 |
| 2026-05-30 00:00 |
06:29:22.83 |
-31:32:12.3 |
HIP 30967 |
23.19 |
| 2026-05-30 12:00 |
06:29:27.52 |
-31:31:54.8 |
HIP 30967 |
22.58 |
| 2026-05-31 00:00 |
06:29:32.22 |
-31:31:37.6 |
HIP 30967 |
22.01 |
| 2026-05-31 12:00 |
06:29:36.94 |
-31:31:20.8 |
HIP 30967 |
21.48 |
| 2026-06-01 00:00 |
06:29:41.68 |
-31:31:04.3 |
HIP 30967 |
21.00 |
| 2026-06-01 12:00 |
06:29:46.43 |
-31:30:48.3 |
HIP 30967 |
20.56 |
| 2026-06-02 00:00 |
06:29:51.19 |
-31:30:32.6 |
HIP 30967 |
20.17 |