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) |
| 2026-05-12 00:00 |
03:21:33.00 |
-00:35:14.5 |
HIP 15621 |
14.44 |
| 2026-05-12 12:00 |
03:21:39.67 |
-00:34:45.5 |
HIP 15621 |
14.81 |
| 2026-05-13 00:00 |
03:21:46.34 |
-00:34:16.7 |
HIP 15728 |
13.14 |
| 2026-05-13 12:00 |
03:21:53.00 |
-00:33:48.2 |
HIP 15728 |
11.42 |
| 2026-05-14 00:00 |
03:21:59.67 |
-00:33:20.0 |
HIP 15728 |
9.69 |
| 2026-05-14 12:00 |
03:22:06.33 |
-00:32:52.0 |
HIP 15728 |
7.98 |
| 2026-05-15 00:00 |
03:22:12.99 |
-00:32:24.3 |
HIP 15728 |
6.26 |
| 2026-05-15 12:00 |
03:22:19.65 |
-00:31:56.9 |
HIP 15728 |
4.57 |
| 2026-05-16 00:00 |
03:22:26.31 |
-00:31:29.7 |
HIP 15728 |
2.90 |
| 2026-05-16 12:00 |
03:22:32.96 |
-00:31:02.8 |
HIP 15728 |
1.40 |
| 2026-05-17 00:00 |
03:22:39.62 |
-00:30:36.2 |
HIP 15728 |
1.18 |
| 2026-05-17 12:00 |
03:22:46.26 |
-00:30:09.8 |
HIP 15728 |
2.60 |
| 2026-05-18 00:00 |
03:22:52.91 |
-00:29:43.7 |
HIP 15728 |
4.24 |
| 2026-05-18 12:00 |
03:22:59.55 |
-00:29:17.9 |
HIP 15728 |
5.93 |
| 2026-05-19 00:00 |
03:23:06.18 |
-00:28:52.4 |
HIP 15728 |
7.62 |
| 2026-05-19 12:00 |
03:23:12.81 |
-00:28:27.1 |
HIP 15728 |
9.32 |
| 2026-05-20 00:00 |
03:23:19.44 |
-00:28:02.1 |
HIP 15728 |
11.02 |
| 2026-05-20 12:00 |
03:23:26.06 |
-00:27:37.4 |
HIP 15728 |
12.71 |
| 2026-05-21 00:00 |
03:23:32.67 |
-00:27:13.0 |
HIP 15728 |
14.41 |
| 2026-05-21 12:00 |
03:23:39.28 |
-00:26:48.9 |
HIP 15728 |
16.11 |
| 2026-05-22 00:00 |
03:23:45.88 |
-00:26:25.0 |
HIP 15728 |
17.80 |
| 2026-05-22 12:00 |
03:23:52.47 |
-00:26:01.4 |
HIP 15728 |
19.49 |
| 2026-05-23 00:00 |
03:23:59.05 |
-00:25:38.2 |
HIP 15728 |
21.18 |
| 2026-05-23 12:00 |
03:24:05.63 |
-00:25:15.1 |
HIP 15728 |
22.86 |
| 2026-05-24 00:00 |
03:24:12.20 |
-00:24:52.4 |
HIP 15728 |
24.55 |
| 2026-05-24 12:00 |
03:24:18.76 |
-00:24:30.0 |
HIP 15728 |
26.23 |
| 2026-05-25 00:00 |
03:24:25.31 |
-00:24:07.8 |
HIP 15728 |
27.90 |
| 2026-05-25 12:00 |
03:24:31.85 |
-00:23:45.9 |
HIP 16000 |
27.48 |
| 2026-05-26 00:00 |
03:24:38.38 |
-00:23:24.4 |
HIP 16000 |
26.33 |
| 2026-05-26 12:00 |
03:24:44.90 |
-00:23:03.1 |
HIP 16000 |
25.24 |
| 2026-05-27 00:00 |
03:24:51.41 |
-00:22:42.1 |
HIP 16000 |
24.21 |
| 2026-05-27 12:00 |
03:24:57.91 |
-00:22:21.3 |
HIP 16000 |
23.25 |
| 2026-05-28 00:00 |
03:25:04.40 |
-00:22:00.9 |
HIP 16000 |
22.37 |
| 2026-05-28 12:00 |
03:25:10.88 |
-00:21:40.8 |
HIP 16000 |
21.58 |
| 2026-05-29 00:00 |
03:25:17.35 |
-00:21:20.9 |
HIP 16000 |
20.90 |
| 2026-05-29 12:00 |
03:25:23.80 |
-00:21:01.3 |
HIP 16000 |
20.32 |
| 2026-05-30 00:00 |
03:25:30.24 |
-00:20:42.1 |
HIP 16000 |
19.85 |
| 2026-05-30 12:00 |
03:25:36.67 |
-00:20:23.1 |
HIP 16000 |
19.51 |
| 2026-05-31 00:00 |
03:25:43.09 |
-00:20:04.4 |
HIP 16000 |
19.30 |
| 2026-05-31 12:00 |
03:25:49.49 |
-00:19:46.0 |
HIP 16000 |
19.23 |
| 2026-06-01 00:00 |
03:25:55.88 |
-00:19:27.9 |
HIP 16000 |
19.29 |
| 2026-06-01 12:00 |
03:26:02.26 |
-00:19:10.1 |
HIP 16000 |
19.47 |
| 2026-06-02 00:00 |
03:26:08.62 |
-00:18:52.6 |
HIP 16000 |
19.79 |