メタデータ
| 項目 |
値 |
| Designation |
C/2018 R5 (Lemmon) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2019-01-09T23:30:34.822080Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:46Z |
| Obs used |
187 |
| NEO |
- |
| M1 |
14.400 |
| K1 |
4.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2018-09-08T05:36:38.592000Z |
| Discovery magnitude (MPC) |
19.00 G |
| Discovery observatory (MPC) |
G96 · University of Arizona Mt. Lemmon Survey |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2018-09-19.0000000 |
| e |
0.84156810 |
| q (au) |
3.621229 |
| a (au) |
22.856691 |
| i (deg) |
103.758081 |
| Ω (om, deg) |
171.141565 |
| ω (w, deg) |
178.011726 |
| M (ma, deg) |
358.980977 |
等級
散乱 + 全体線形
$$
M_a = (14.981 + 2.627\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
14.981 |
| n |
2.627 |
| gf |
0.812 |
| gb |
-0.918 |
| k |
0.981 |
| δ90 |
1.000 |
| 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) |
| 2026-06-01 00:00 |
10:30:35.02 |
-42:28:52.5 |
HIP 51397 |
11.43 |
| 2026-06-01 12:00 |
10:30:36.27 |
-42:27:11.0 |
HIP 51397 |
10.49 |
| 2026-06-02 00:00 |
10:30:37.59 |
-42:25:29.8 |
HIP 51397 |
9.78 |
| 2026-06-02 12:00 |
10:30:38.99 |
-42:23:49.1 |
HIP 51397 |
9.34 |
| 2026-06-03 00:00 |
10:30:40.46 |
-42:22:08.7 |
HIP 51397 |
9.21 |
| 2026-06-03 12:00 |
10:30:42.00 |
-42:20:28.6 |
HIP 51504 |
8.51 |
| 2026-06-04 00:00 |
10:30:43.63 |
-42:18:49.0 |
HIP 51504 |
6.97 |
| 2026-06-04 12:00 |
10:30:45.32 |
-42:17:09.7 |
HIP 51504 |
5.52 |
| 2026-06-05 00:00 |
10:30:47.09 |
-42:15:30.9 |
HIP 51504 |
4.22 |
| 2026-06-05 12:00 |
10:30:48.93 |
-42:13:52.4 |
HIP 51504 |
3.28 |
| 2026-06-06 00:00 |
10:30:50.85 |
-42:12:14.4 |
HIP 51504 |
3.04 |
| 2026-06-06 12:00 |
10:30:52.84 |
-42:10:36.7 |
HIP 51504 |
3.64 |
| 2026-06-07 00:00 |
10:30:54.90 |
-42:08:59.5 |
HIP 51504 |
4.76 |
| 2026-06-07 12:00 |
10:30:57.04 |
-42:07:22.7 |
HIP 51504 |
6.12 |
| 2026-06-08 00:00 |
10:30:59.25 |
-42:05:46.4 |
HIP 51504 |
7.59 |
| 2026-06-08 12:00 |
10:31:01.53 |
-42:04:10.4 |
HIP 51504 |
9.12 |
| 2026-06-09 00:00 |
10:31:03.88 |
-42:02:34.9 |
HIP 51504 |
10.68 |
| 2026-06-09 12:00 |
10:31:06.30 |
-42:00:59.9 |
HIP 51504 |
12.25 |
| 2026-06-10 00:00 |
10:31:08.80 |
-41:59:25.3 |
HIP 51504 |
13.84 |
| 2026-06-10 12:00 |
10:31:11.36 |
-41:57:51.1 |
HIP 51504 |
15.43 |
| 2026-06-11 00:00 |
10:31:14.00 |
-41:56:17.4 |
HIP 51504 |
17.02 |
| 2026-06-11 12:00 |
10:31:16.71 |
-41:54:44.2 |
HIP 51504 |
18.61 |
| 2026-06-12 00:00 |
10:31:19.49 |
-41:53:11.4 |
HIP 51504 |
20.21 |
| 2026-06-12 12:00 |
10:31:22.33 |
-41:51:39.1 |
HIP 51504 |
21.80 |
| 2026-06-13 00:00 |
10:31:25.25 |
-41:50:07.3 |
HIP 51504 |
23.39 |
| 2026-06-13 12:00 |
10:31:28.24 |
-41:48:36.0 |
HIP 51504 |
24.98 |
| 2026-06-14 00:00 |
10:31:31.29 |
-41:47:05.1 |
HIP 51622 |
24.36 |
| 2026-06-14 12:00 |
10:31:34.41 |
-41:45:34.8 |
HIP 51622 |
22.80 |
| 2026-06-15 00:00 |
10:31:37.61 |
-41:44:04.9 |
HIP 51622 |
21.25 |
| 2026-06-15 12:00 |
10:31:40.87 |
-41:42:35.6 |
HIP 51622 |
19.71 |
| 2026-06-16 00:00 |
10:31:44.19 |
-41:41:06.7 |
HIP 51622 |
18.18 |
| 2026-06-16 12:00 |
10:31:47.59 |
-41:39:38.4 |
HIP 51622 |
16.66 |
| 2026-06-17 00:00 |
10:31:51.05 |
-41:38:10.6 |
HIP 51622 |
15.15 |
| 2026-06-17 12:00 |
10:31:54.57 |
-41:36:43.3 |
HIP 51622 |
13.66 |
| 2026-06-18 00:00 |
10:31:58.16 |
-41:35:16.5 |
HIP 51622 |
12.19 |
| 2026-06-18 12:00 |
10:32:01.82 |
-41:33:50.3 |
HIP 51622 |
10.76 |
| 2026-06-19 00:00 |
10:32:05.54 |
-41:32:24.6 |
HIP 51622 |
9.37 |
| 2026-06-19 12:00 |
10:32:09.33 |
-41:30:59.4 |
HIP 51622 |
8.05 |
| 2026-06-20 00:00 |
10:32:13.18 |
-41:29:34.8 |
HIP 51622 |
6.83 |
| 2026-06-20 12:00 |
10:32:17.10 |
-41:28:10.7 |
HIP 51622 |
5.78 |
| 2026-06-21 00:00 |
10:32:21.08 |
-41:26:47.1 |
HIP 51622 |
5.00 |
| 2026-06-21 12:00 |
10:32:25.12 |
-41:25:24.1 |
HIP 51622 |
4.64 |
| 2026-06-22 00:00 |
10:32:29.22 |
-41:24:01.7 |
HIP 51622 |
4.78 |