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) |
| 2026-05-12 00:00 |
09:23:58.21 |
+15:36:30.2 |
HIP 45989 |
20.07 |
| 2026-05-12 12:00 |
09:23:58.90 |
+15:36:52.0 |
HIP 45989 |
20.03 |
| 2026-05-13 00:00 |
09:23:59.66 |
+15:37:13.5 |
HIP 45989 |
20.02 |
| 2026-05-13 12:00 |
09:24:00.48 |
+15:37:34.6 |
HIP 45989 |
20.03 |
| 2026-05-14 00:00 |
09:24:01.37 |
+15:37:55.3 |
HIP 45989 |
20.07 |
| 2026-05-14 12:00 |
09:24:02.32 |
+15:38:15.7 |
HIP 45989 |
20.14 |
| 2026-05-15 00:00 |
09:24:03.34 |
+15:38:35.7 |
HIP 45989 |
20.23 |
| 2026-05-15 12:00 |
09:24:04.43 |
+15:38:55.4 |
HIP 45989 |
20.34 |
| 2026-05-16 00:00 |
09:24:05.58 |
+15:39:14.8 |
HIP 45989 |
20.48 |
| 2026-05-16 12:00 |
09:24:06.80 |
+15:39:33.8 |
HIP 45989 |
20.64 |
| 2026-05-17 00:00 |
09:24:08.08 |
+15:39:52.5 |
HIP 45989 |
20.83 |
| 2026-05-17 12:00 |
09:24:09.43 |
+15:40:10.8 |
HIP 45989 |
21.04 |
| 2026-05-18 00:00 |
09:24:10.84 |
+15:40:28.8 |
HIP 45989 |
21.28 |
| 2026-05-18 12:00 |
09:24:12.32 |
+15:40:46.4 |
HIP 45989 |
21.54 |
| 2026-05-19 00:00 |
09:24:13.86 |
+15:41:03.7 |
HIP 45989 |
21.82 |
| 2026-05-19 12:00 |
09:24:15.46 |
+15:41:20.7 |
HIP 45989 |
22.12 |
| 2026-05-20 00:00 |
09:24:17.13 |
+15:41:37.3 |
HIP 45989 |
22.45 |
| 2026-05-20 12:00 |
09:24:18.86 |
+15:41:53.6 |
HIP 45989 |
22.80 |
| 2026-05-21 00:00 |
09:24:20.66 |
+15:42:09.5 |
HIP 45989 |
23.17 |
| 2026-05-21 12:00 |
09:24:22.52 |
+15:42:25.2 |
HIP 45989 |
23.56 |
| 2026-05-22 00:00 |
09:24:24.44 |
+15:42:40.5 |
HIP 45989 |
23.97 |
| 2026-05-22 12:00 |
09:24:26.42 |
+15:42:55.4 |
HIP 45989 |
24.40 |
| 2026-05-23 00:00 |
09:24:28.47 |
+15:43:10.1 |
HIP 45989 |
24.85 |
| 2026-05-23 12:00 |
09:24:30.57 |
+15:43:24.4 |
HIP 45989 |
25.32 |
| 2026-05-24 00:00 |
09:24:32.74 |
+15:43:38.4 |
HIP 45989 |
25.81 |
| 2026-05-24 12:00 |
09:24:34.97 |
+15:43:52.1 |
HIP 45989 |
26.32 |
| 2026-05-25 00:00 |
09:24:37.26 |
+15:44:05.4 |
HIP 45989 |
26.85 |
| 2026-05-25 12:00 |
09:24:39.61 |
+15:44:18.5 |
HIP 45989 |
27.39 |
| 2026-05-26 00:00 |
09:24:42.02 |
+15:44:31.2 |
HIP 45989 |
27.95 |
| 2026-05-26 12:00 |
09:24:44.49 |
+15:44:43.6 |
HIP 45989 |
28.53 |
| 2026-05-27 00:00 |
09:24:47.02 |
+15:44:55.7 |
HIP 45989 |
29.13 |
| 2026-05-27 12:00 |
09:24:49.61 |
+15:45:07.5 |
HIP 45989 |
29.74 |
| 2026-05-28 00:00 |
09:24:52.26 |
+15:45:19.0 |
HIP 45989 |
30.36 |
| 2026-05-28 12:00 |
09:24:54.96 |
+15:45:30.1 |
HIP 45989 |
31.01 |
| 2026-05-29 00:00 |
09:24:57.73 |
+15:45:41.0 |
HIP 45989 |
31.67 |
| 2026-05-29 12:00 |
09:25:00.55 |
+15:45:51.5 |
HIP 45989 |
32.34 |
| 2026-05-30 00:00 |
09:25:03.43 |
+15:46:01.8 |
HIP 45989 |
33.03 |
| 2026-05-30 12:00 |
09:25:06.37 |
+15:46:11.7 |
HIP 45989 |
33.73 |
| 2026-05-31 00:00 |
09:25:09.36 |
+15:46:21.4 |
HIP 45989 |
34.45 |
| 2026-05-31 12:00 |
09:25:12.41 |
+15:46:30.7 |
HIP 45989 |
35.18 |
| 2026-06-01 00:00 |
09:25:15.52 |
+15:46:39.7 |
HIP 46397 |
34.70 |
| 2026-06-01 12:00 |
09:25:18.69 |
+15:46:48.5 |
HIP 46397 |
33.95 |
| 2026-06-02 00:00 |
09:25:21.91 |
+15:46:56.9 |
HIP 46397 |
33.19 |