メタデータ
| 項目 |
値 |
| Designation |
C/2018 KJ3 (Lemmon) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2019-09-09T23:33:42.448320Z |
| Orbit solution date (soln_date, UTC) |
2021-09-04T23:42:57Z |
| Obs used |
465 |
| NEO |
- |
| M1 |
6.400 |
| K1 |
13.500 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2018-08-10.0000000 |
| e |
0.99581434 |
| q (au) |
3.627197 |
| a (au) |
866.577156 |
| i (deg) |
136.667328 |
| Ω (om, deg) |
91.587697 |
| ω (w, deg) |
217.709783 |
| M (ma, deg) |
359.984701 |
等級
散乱 + 全体線形
$$
M_a = (H_0 + n\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
- |
| n |
- |
| gf |
- |
| gb |
- |
| k |
- |
| δ90 |
- |
| 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) |
| 2026-07-29 00:00 |
07:00:17.50 |
+12:01:30.1 |
HIP 33684 |
14.74 |
| 2026-07-29 12:00 |
07:00:22.76 |
+12:01:25.3 |
HIP 33684 |
15.26 |
| 2026-07-30 00:00 |
07:00:28.00 |
+12:01:20.4 |
HIP 33684 |
15.86 |
| 2026-07-30 12:00 |
07:00:33.22 |
+12:01:15.4 |
HIP 33684 |
16.53 |
| 2026-07-31 00:00 |
07:00:38.41 |
+12:01:10.2 |
HIP 33810 |
16.58 |
| 2026-07-31 12:00 |
07:00:43.59 |
+12:01:05.0 |
HIP 33810 |
15.96 |
| 2026-08-01 00:00 |
07:00:48.74 |
+12:00:59.7 |
HIP 33810 |
15.41 |
| 2026-08-01 12:00 |
07:00:53.87 |
+12:00:54.2 |
HIP 33810 |
14.95 |
| 2026-08-02 00:00 |
07:00:58.98 |
+12:00:48.7 |
HIP 33810 |
14.58 |
| 2026-08-02 12:00 |
07:01:04.07 |
+12:00:43.0 |
HIP 33810 |
14.31 |
| 2026-08-03 00:00 |
07:01:09.13 |
+12:00:37.2 |
HIP 33810 |
14.14 |
| 2026-08-03 12:00 |
07:01:14.17 |
+12:00:31.4 |
HIP 33810 |
14.08 |
| 2026-08-04 00:00 |
07:01:19.19 |
+12:00:25.4 |
HIP 33810 |
14.13 |
| 2026-08-04 12:00 |
07:01:24.18 |
+12:00:19.3 |
HIP 33810 |
14.28 |
| 2026-08-05 00:00 |
07:01:29.14 |
+12:00:13.1 |
HIP 33810 |
14.53 |
| 2026-08-05 12:00 |
07:01:34.09 |
+12:00:06.9 |
HIP 33810 |
14.87 |
| 2026-08-06 00:00 |
07:01:39.00 |
+12:00:00.5 |
HIP 33810 |
15.29 |
| 2026-08-06 12:00 |
07:01:43.89 |
+11:59:54.0 |
HIP 33810 |
15.80 |
| 2026-08-07 00:00 |
07:01:48.76 |
+11:59:47.4 |
HIP 33810 |
16.36 |
| 2026-08-07 12:00 |
07:01:53.60 |
+11:59:40.8 |
HIP 33810 |
16.99 |
| 2026-08-08 00:00 |
07:01:58.41 |
+11:59:34.0 |
HIP 33810 |
17.68 |
| 2026-08-08 12:00 |
07:02:03.19 |
+11:59:27.1 |
HIP 33810 |
18.40 |
| 2026-08-09 00:00 |
07:02:07.95 |
+11:59:20.2 |
HIP 33810 |
19.17 |
| 2026-08-09 12:00 |
07:02:12.68 |
+11:59:13.2 |
HIP 33974 |
19.37 |
| 2026-08-10 00:00 |
07:02:17.38 |
+11:59:06.0 |
HIP 33974 |
18.62 |
| 2026-08-10 12:00 |
07:02:22.05 |
+11:58:58.8 |
HIP 33974 |
17.91 |
| 2026-08-11 00:00 |
07:02:26.70 |
+11:58:51.5 |
HIP 33974 |
17.25 |
| 2026-08-11 12:00 |
07:02:31.31 |
+11:58:44.1 |
HIP 33974 |
16.64 |
| 2026-08-12 00:00 |
07:02:35.89 |
+11:58:36.6 |
HIP 33974 |
16.09 |
| 2026-08-12 12:00 |
07:02:40.44 |
+11:58:29.1 |
HIP 33974 |
15.61 |
| 2026-08-13 00:00 |
07:02:44.97 |
+11:58:21.4 |
HIP 33974 |
15.19 |
| 2026-08-13 12:00 |
07:02:49.46 |
+11:58:13.7 |
HIP 33974 |
14.85 |
| 2026-08-14 00:00 |
07:02:53.92 |
+11:58:05.9 |
HIP 33974 |
14.58 |
| 2026-08-14 12:00 |
07:02:58.34 |
+11:57:58.0 |
HIP 33974 |
14.39 |
| 2026-08-15 00:00 |
07:03:02.74 |
+11:57:50.1 |
HIP 33974 |
14.27 |
| 2026-08-15 12:00 |
07:03:07.10 |
+11:57:42.1 |
HIP 33974 |
14.24 |
| 2026-08-16 00:00 |
07:03:11.43 |
+11:57:34.0 |
HIP 33974 |
14.29 |
| 2026-08-16 12:00 |
07:03:15.73 |
+11:57:25.8 |
HIP 33974 |
14.41 |
| 2026-08-17 00:00 |
07:03:19.99 |
+11:57:17.6 |
HIP 33974 |
14.60 |
| 2026-08-17 12:00 |
07:03:24.22 |
+11:57:09.3 |
HIP 33974 |
14.87 |
| 2026-08-18 00:00 |
07:03:28.41 |
+11:57:00.9 |
HIP 33974 |
15.19 |
| 2026-08-18 12:00 |
07:03:32.57 |
+11:56:52.5 |
HIP 33974 |
15.57 |
| 2026-08-19 00:00 |
07:03:36.69 |
+11:56:44.0 |
HIP 33974 |
16.00 |