メタデータ
| 項目 |
値 |
| Designation |
C/2019 J1 (Lemmon) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2019-04-09T08:09:59.362560Z |
| Orbit solution date (soln_date, UTC) |
2023-01-14T00:12:30Z |
| Obs used |
192 |
| NEO |
- |
| M1 |
12.000 |
| K1 |
11.250 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2019-05-04T10:44:49.920000Z |
| Discovery magnitude (MPC) |
17.40 G |
| Discovery observatory (MPC) |
G96 · Mt. Lemmon Survey |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2019-06-18.0000000 |
| e |
0.96535584 |
| q (au) |
2.478657 |
| a (au) |
71.546171 |
| i (deg) |
24.549745 |
| Ω (om, deg) |
98.087033 |
| ω (w, deg) |
167.794427 |
| M (ma, deg) |
0.113450 |
等級
散乱 + 全体線形
$$
M_a = (11.407 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
11.407 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.650 |
| k |
0.897 |
| 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) |
| 2026-03-26 00:00 |
03:11:57.50 |
-01:36:21.0 |
HIP 14736 |
25.41 |
| 2026-03-26 12:00 |
03:12:02.57 |
-01:35:34.9 |
HIP 14954 |
26.22 |
| 2026-03-27 00:00 |
03:12:07.67 |
-01:34:48.9 |
HIP 14954 |
25.00 |
| 2026-03-27 12:00 |
03:12:12.81 |
-01:34:03.0 |
HIP 14954 |
23.82 |
| 2026-03-28 00:00 |
03:12:17.97 |
-01:33:17.2 |
HIP 14954 |
22.67 |
| 2026-03-28 12:00 |
03:12:23.17 |
-01:32:31.4 |
HIP 14954 |
21.56 |
| 2026-03-29 00:00 |
03:12:28.41 |
-01:31:45.8 |
HIP 14954 |
20.50 |
| 2026-03-29 12:00 |
03:12:33.67 |
-01:31:00.3 |
HIP 14954 |
19.51 |
| 2026-03-30 00:00 |
03:12:38.96 |
-01:30:14.8 |
HIP 14954 |
18.58 |
| 2026-03-30 12:00 |
03:12:44.29 |
-01:29:29.5 |
HIP 14954 |
17.74 |
| 2026-03-31 00:00 |
03:12:49.64 |
-01:28:44.3 |
HIP 14954 |
17.00 |
| 2026-03-31 12:00 |
03:12:55.03 |
-01:27:59.2 |
HIP 14954 |
16.38 |
| 2026-04-01 00:00 |
03:13:00.44 |
-01:27:14.2 |
HIP 14954 |
15.88 |
| 2026-04-01 12:00 |
03:13:05.89 |
-01:26:29.3 |
HIP 14954 |
15.52 |
| 2026-04-02 00:00 |
03:13:11.36 |
-01:25:44.5 |
HIP 14954 |
15.32 |
| 2026-04-02 12:00 |
03:13:16.87 |
-01:24:59.9 |
HIP 14954 |
15.28 |
| 2026-04-03 00:00 |
03:13:22.40 |
-01:24:15.3 |
HIP 14954 |
15.41 |
| 2026-04-03 12:00 |
03:13:27.96 |
-01:23:30.9 |
HIP 14954 |
15.70 |
| 2026-04-04 00:00 |
03:13:33.55 |
-01:22:46.6 |
HIP 14954 |
16.15 |
| 2026-04-04 12:00 |
03:13:39.16 |
-01:22:02.4 |
HIP 14954 |
16.74 |
| 2026-04-05 00:00 |
03:13:44.80 |
-01:21:18.4 |
HIP 14954 |
17.46 |
| 2026-04-05 12:00 |
03:13:50.47 |
-01:20:34.5 |
HIP 14954 |
18.30 |
| 2026-04-06 00:00 |
03:13:56.17 |
-01:19:50.7 |
HIP 14954 |
19.24 |
| 2026-04-06 12:00 |
03:14:01.89 |
-01:19:07.1 |
HIP 14954 |
20.27 |
| 2026-04-07 00:00 |
03:14:07.64 |
-01:18:23.6 |
HIP 15158 |
20.20 |
| 2026-04-07 12:00 |
03:14:13.41 |
-01:17:40.2 |
HIP 15158 |
18.59 |
| 2026-04-08 00:00 |
03:14:19.21 |
-01:16:56.9 |
HIP 15158 |
16.98 |
| 2026-04-08 12:00 |
03:14:25.04 |
-01:16:13.8 |
HIP 15158 |
15.36 |
| 2026-04-09 00:00 |
03:14:30.89 |
-01:15:30.9 |
HIP 15158 |
13.74 |
| 2026-04-09 12:00 |
03:14:36.76 |
-01:14:48.1 |
HIP 15158 |
12.11 |
| 2026-04-10 00:00 |
03:14:42.66 |
-01:14:05.4 |
HIP 15158 |
10.49 |
| 2026-04-10 12:00 |
03:14:48.58 |
-01:13:22.9 |
HIP 15158 |
8.86 |
| 2026-04-11 00:00 |
03:14:54.52 |
-01:12:40.6 |
HIP 15158 |
7.24 |
| 2026-04-11 12:00 |
03:15:00.49 |
-01:11:58.4 |
HIP 15158 |
5.62 |
| 2026-04-12 00:00 |
03:15:06.48 |
-01:11:16.3 |
HIP 15158 |
4.02 |
| 2026-04-12 12:00 |
03:15:12.49 |
-01:10:34.5 |
HIP 15158 |
2.48 |
| 2026-04-13 00:00 |
03:15:18.53 |
-01:09:52.7 |
HIP 15158 |
1.28 |
| 2026-04-13 12:00 |
03:15:24.58 |
-01:09:11.2 |
HIP 15158 |
1.62 |
| 2026-04-14 00:00 |
03:15:30.66 |
-01:08:29.8 |
HIP 15158 |
3.03 |
| 2026-04-14 12:00 |
03:15:36.75 |
-01:07:48.6 |
HIP 15158 |
4.62 |
| 2026-04-15 00:00 |
03:15:42.87 |
-01:07:07.5 |
HIP 15158 |
6.25 |
| 2026-04-15 12:00 |
03:15:49.01 |
-01:06:26.6 |
HIP 15158 |
7.91 |
| 2026-04-16 00:00 |
03:15:55.17 |
-01:05:45.9 |
HIP 15158 |
9.57 |