C/2007 S2 (Lemmon)
メタデータ
| 項目 |
値 |
| Designation |
C/2007 S2 (Lemmon) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2008-09-14T20:38:31.534080Z |
| Orbit solution date (soln_date, UTC) |
2024-04-13T16:42:27Z |
| Obs used |
423 |
| NEO |
- |
| M1 |
10.500 |
| K1 |
6.000 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2008-07-02.0000000 |
| e |
0.55701356 |
| q (au) |
5.557956 |
| a (au) |
12.546561 |
| i (deg) |
16.862815 |
| Ω (om, deg) |
296.252831 |
| ω (w, deg) |
210.466010 |
| M (ma, deg) |
358.339773 |
等級
散乱 + 全体線形
$$
M_a = (9.208 + 2.571\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
9.208 |
| n |
2.571 |
| gf |
1.000 |
| gb |
-0.969 |
| 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
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
20:53:55.32 |
-12:41:28.8 |
HIP 103151 |
23.98 |
| 2026-02-03 12:00 |
20:54:02.09 |
-12:40:56.3 |
HIP 103151 |
23.46 |
| 2026-02-04 00:00 |
20:54:08.86 |
-12:40:23.7 |
HIP 103151 |
23.06 |
| 2026-02-04 12:00 |
20:54:15.63 |
-12:39:51.0 |
HIP 103151 |
22.78 |
| 2026-02-05 00:00 |
20:54:22.39 |
-12:39:18.3 |
HIP 103151 |
22.63 |
| 2026-02-05 12:00 |
20:54:29.15 |
-12:38:45.5 |
HIP 103300 |
21.71 |
| 2026-02-06 00:00 |
20:54:35.90 |
-12:38:12.6 |
HIP 103300 |
20.79 |
| 2026-02-06 12:00 |
20:54:42.65 |
-12:37:39.7 |
HIP 103300 |
19.98 |
| 2026-02-07 00:00 |
20:54:49.39 |
-12:37:06.8 |
HIP 103300 |
19.30 |
| 2026-02-07 12:00 |
20:54:56.13 |
-12:36:33.7 |
HIP 103300 |
18.75 |
| 2026-02-08 00:00 |
20:55:02.86 |
-12:36:00.7 |
HIP 103300 |
18.35 |
| 2026-02-08 12:00 |
20:55:09.58 |
-12:35:27.6 |
HIP 103300 |
18.11 |
| 2026-02-09 00:00 |
20:55:16.30 |
-12:34:54.4 |
HIP 103300 |
18.04 |
| 2026-02-09 12:00 |
20:55:23.01 |
-12:34:21.2 |
HIP 103300 |
18.13 |
| 2026-02-10 00:00 |
20:55:29.71 |
-12:33:47.9 |
HIP 103300 |
18.39 |
| 2026-02-10 12:00 |
20:55:36.40 |
-12:33:14.6 |
HIP 103300 |
18.80 |
| 2026-02-11 00:00 |
20:55:43.09 |
-12:32:41.3 |
HIP 103300 |
19.36 |
| 2026-02-11 12:00 |
20:55:49.76 |
-12:32:07.9 |
HIP 103300 |
20.05 |
| 2026-02-12 00:00 |
20:55:56.43 |
-12:31:34.5 |
HIP 103300 |
20.86 |
| 2026-02-12 12:00 |
20:56:03.08 |
-12:31:01.0 |
HIP 103349 |
21.24 |
| 2026-02-13 00:00 |
20:56:09.73 |
-12:30:27.5 |
HIP 103349 |
20.45 |
| 2026-02-13 12:00 |
20:56:16.36 |
-12:29:54.0 |
HIP 103349 |
19.78 |
| 2026-02-14 00:00 |
20:56:22.98 |
-12:29:20.4 |
HIP 103349 |
19.24 |
| 2026-02-14 12:00 |
20:56:29.60 |
-12:28:46.8 |
HIP 103349 |
18.83 |
| 2026-02-15 00:00 |
20:56:36.20 |
-12:28:13.2 |
HIP 103349 |
18.58 |
| 2026-02-15 12:00 |
20:56:42.79 |
-12:27:39.5 |
HIP 103349 |
18.48 |
| 2026-02-16 00:00 |
20:56:49.36 |
-12:27:05.9 |
HIP 103349 |
18.53 |
| 2026-02-16 12:00 |
20:56:55.92 |
-12:26:32.2 |
HIP 103349 |
18.73 |
| 2026-02-17 00:00 |
20:57:02.47 |
-12:25:58.5 |
HIP 103349 |
19.09 |
| 2026-02-17 12:00 |
20:57:09.01 |
-12:25:24.7 |
HIP 103349 |
19.58 |
| 2026-02-18 00:00 |
20:57:15.53 |
-12:24:51.0 |
HIP 103349 |
20.20 |
| 2026-02-18 12:00 |
20:57:22.04 |
-12:24:17.2 |
HIP 103349 |
20.93 |
| 2026-02-19 00:00 |
20:57:28.53 |
-12:23:43.4 |
HIP 103349 |
21.77 |
| 2026-02-19 12:00 |
20:57:35.00 |
-12:23:09.6 |
HIP 103349 |
22.70 |
| 2026-02-20 00:00 |
20:57:41.46 |
-12:22:35.8 |
HIP 103349 |
23.71 |
| 2026-02-20 12:00 |
20:57:47.91 |
-12:22:02.0 |
HIP 103349 |
24.79 |
| 2026-02-21 00:00 |
20:57:54.34 |
-12:21:28.2 |
HIP 103487 |
24.25 |
| 2026-02-21 12:00 |
20:58:00.75 |
-12:20:54.4 |
HIP 103487 |
23.61 |
| 2026-02-22 00:00 |
20:58:07.14 |
-12:20:20.6 |
HIP 103487 |
23.08 |
| 2026-02-22 12:00 |
20:58:13.52 |
-12:19:46.8 |
HIP 103487 |
22.66 |
| 2026-02-23 00:00 |
20:58:19.87 |
-12:19:13.0 |
HIP 103487 |
22.36 |
| 2026-02-23 12:00 |
20:58:26.21 |
-12:18:39.1 |
HIP 103487 |
22.17 |
| 2026-02-24 00:00 |
20:58:32.53 |
-12:18:05.3 |
HIP 103487 |
22.10 |