メタデータ
| 項目 |
値 |
| Designation |
C/2019 NJ3 (Lemmon) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2020-10-22T02:23:32.611200Z |
| Orbit solution date (soln_date, UTC) |
2026-03-11T21:13:02Z |
| Obs used |
70 |
| NEO |
- |
| M1 |
6.600 |
| K1 |
13.500 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2020-03-25.0000000 |
| e |
1.00093598 |
| q (au) |
4.361928 |
| a (au) |
-4660.256154 |
| i (deg) |
99.435702 |
| Ω (om, deg) |
142.451880 |
| ω (w, deg) |
246.812804 |
| M (ma, deg) |
-0.000654 |
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 |
09:36:06.38 |
+15:38:15.9 |
HIP 47233 |
24.72 |
| 2026-07-29 12:00 |
09:36:13.61 |
+15:38:02.8 |
HIP 47233 |
23.07 |
| 2026-07-30 00:00 |
09:36:20.84 |
+15:37:49.6 |
HIP 47233 |
21.42 |
| 2026-07-30 12:00 |
09:36:28.09 |
+15:37:36.3 |
HIP 47233 |
19.80 |
| 2026-07-31 00:00 |
09:36:35.35 |
+15:37:23.0 |
HIP 47233 |
18.20 |
| 2026-07-31 12:00 |
09:36:42.62 |
+15:37:09.6 |
HIP 47233 |
16.62 |
| 2026-08-01 00:00 |
09:36:49.90 |
+15:36:56.2 |
HIP 47233 |
15.09 |
| 2026-08-01 12:00 |
09:36:57.18 |
+15:36:42.7 |
HIP 47233 |
13.61 |
| 2026-08-02 00:00 |
09:37:04.48 |
+15:36:29.2 |
HIP 47233 |
12.20 |
| 2026-08-02 12:00 |
09:37:11.79 |
+15:36:15.6 |
HIP 47233 |
10.90 |
| 2026-08-03 00:00 |
09:37:19.10 |
+15:36:01.9 |
HIP 47233 |
9.75 |
| 2026-08-03 12:00 |
09:37:26.43 |
+15:35:48.2 |
HIP 47233 |
8.81 |
| 2026-08-04 00:00 |
09:37:33.76 |
+15:35:34.5 |
HIP 47233 |
8.15 |
| 2026-08-04 12:00 |
09:37:41.10 |
+15:35:20.7 |
HIP 47233 |
7.85 |
| 2026-08-05 00:00 |
09:37:48.45 |
+15:35:06.9 |
HIP 47233 |
7.95 |
| 2026-08-05 12:00 |
09:37:55.80 |
+15:34:53.0 |
HIP 47233 |
8.43 |
| 2026-08-06 00:00 |
09:38:03.16 |
+15:34:39.1 |
HIP 47233 |
9.24 |
| 2026-08-06 12:00 |
09:38:10.52 |
+15:34:25.2 |
HIP 47233 |
10.30 |
| 2026-08-07 00:00 |
09:38:17.90 |
+15:34:11.2 |
HIP 47233 |
11.54 |
| 2026-08-07 12:00 |
09:38:25.27 |
+15:33:57.2 |
HIP 47233 |
12.91 |
| 2026-08-08 00:00 |
09:38:32.65 |
+15:33:43.2 |
HIP 47233 |
14.38 |
| 2026-08-08 12:00 |
09:38:40.04 |
+15:33:29.2 |
HIP 47233 |
15.91 |
| 2026-08-09 00:00 |
09:38:47.43 |
+15:33:15.1 |
HIP 47233 |
17.50 |
| 2026-08-09 12:00 |
09:38:54.82 |
+15:33:01.0 |
HIP 47233 |
19.12 |
| 2026-08-10 00:00 |
09:39:02.22 |
+15:32:46.9 |
HIP 47233 |
20.77 |
| 2026-08-10 12:00 |
09:39:09.62 |
+15:32:32.8 |
HIP 47233 |
22.45 |
| 2026-08-11 00:00 |
09:39:17.02 |
+15:32:18.7 |
HIP 47233 |
24.14 |
| 2026-08-11 12:00 |
09:39:24.42 |
+15:32:04.5 |
HIP 47233 |
25.85 |
| 2026-08-12 00:00 |
09:39:31.82 |
+15:31:50.4 |
HIP 47233 |
27.57 |
| 2026-08-12 12:00 |
09:39:39.23 |
+15:31:36.2 |
HIP 47233 |
29.30 |
| 2026-08-13 00:00 |
09:39:46.63 |
+15:31:22.0 |
HIP 47233 |
31.04 |
| 2026-08-13 12:00 |
09:39:54.04 |
+15:31:07.9 |
HIP 47557 |
30.46 |
| 2026-08-14 00:00 |
09:40:01.44 |
+15:30:53.7 |
HIP 47557 |
29.01 |
| 2026-08-14 12:00 |
09:40:08.85 |
+15:30:39.6 |
HIP 47557 |
27.60 |
| 2026-08-15 00:00 |
09:40:16.25 |
+15:30:25.4 |
HIP 47557 |
26.24 |
| 2026-08-15 12:00 |
09:40:23.65 |
+15:30:11.3 |
HIP 47557 |
24.94 |
| 2026-08-16 00:00 |
09:40:31.04 |
+15:29:57.2 |
HIP 47557 |
23.70 |
| 2026-08-16 12:00 |
09:40:38.44 |
+15:29:43.1 |
HIP 47557 |
22.53 |
| 2026-08-17 00:00 |
09:40:45.83 |
+15:29:29.0 |
HIP 47557 |
21.46 |
| 2026-08-17 12:00 |
09:40:53.22 |
+15:29:15.0 |
HIP 47557 |
20.48 |
| 2026-08-18 00:00 |
09:41:00.60 |
+15:29:00.9 |
HIP 47557 |
19.62 |
| 2026-08-18 12:00 |
09:41:07.98 |
+15:28:46.9 |
HIP 47557 |
18.90 |
| 2026-08-19 00:00 |
09:41:15.36 |
+15:28:32.9 |
HIP 47557 |
18.31 |