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) |
| 2026-07-29 00:00 |
10:39:56.73 |
-40:10:41.7 |
HIP 52180 |
13.56 |
| 2026-07-29 12:00 |
10:40:04.31 |
-40:10:06.8 |
HIP 52180 |
13.50 |
| 2026-07-30 00:00 |
10:40:11.92 |
-40:09:32.6 |
HIP 52248 |
12.70 |
| 2026-07-30 12:00 |
10:40:19.56 |
-40:08:59.0 |
HIP 52248 |
11.77 |
| 2026-07-31 00:00 |
10:40:27.23 |
-40:08:26.1 |
HIP 52248 |
10.99 |
| 2026-07-31 12:00 |
10:40:34.93 |
-40:07:53.9 |
HIP 52248 |
10.41 |
| 2026-08-01 00:00 |
10:40:42.65 |
-40:07:22.3 |
HIP 52248 |
10.05 |
| 2026-08-01 12:00 |
10:40:50.40 |
-40:06:51.5 |
HIP 52248 |
9.94 |
| 2026-08-02 00:00 |
10:40:58.18 |
-40:06:21.2 |
HIP 52248 |
10.09 |
| 2026-08-02 12:00 |
10:41:05.99 |
-40:05:51.7 |
HIP 52248 |
10.48 |
| 2026-08-03 00:00 |
10:41:13.82 |
-40:05:22.8 |
HIP 52248 |
11.11 |
| 2026-08-03 12:00 |
10:41:21.68 |
-40:04:54.6 |
HIP 52248 |
11.91 |
| 2026-08-04 00:00 |
10:41:29.57 |
-40:04:27.1 |
HIP 52248 |
12.88 |
| 2026-08-04 12:00 |
10:41:37.48 |
-40:04:00.2 |
HIP 52248 |
13.96 |
| 2026-08-05 00:00 |
10:41:45.41 |
-40:03:34.1 |
HIP 52248 |
15.14 |
| 2026-08-05 12:00 |
10:41:53.37 |
-40:03:08.5 |
HIP 52248 |
16.40 |
| 2026-08-06 00:00 |
10:42:01.35 |
-40:02:43.7 |
HIP 52248 |
17.72 |
| 2026-08-06 12:00 |
10:42:09.35 |
-40:02:19.5 |
HIP 52248 |
19.08 |
| 2026-08-07 00:00 |
10:42:17.38 |
-40:01:56.0 |
HIP 52367 |
20.26 |
| 2026-08-07 12:00 |
10:42:25.43 |
-40:01:33.2 |
HIP 52367 |
20.03 |
| 2026-08-08 00:00 |
10:42:33.51 |
-40:01:11.0 |
HIP 52367 |
19.93 |
| 2026-08-08 12:00 |
10:42:41.60 |
-40:00:49.6 |
HIP 52367 |
19.97 |
| 2026-08-09 00:00 |
10:42:49.71 |
-40:00:28.7 |
HIP 52367 |
20.14 |
| 2026-08-09 12:00 |
10:42:57.85 |
-40:00:08.6 |
HIP 52367 |
20.46 |
| 2026-08-10 00:00 |
10:43:06.01 |
-39:59:49.1 |
HIP 52367 |
20.90 |
| 2026-08-10 12:00 |
10:43:14.18 |
-39:59:30.3 |
HIP 52367 |
21.46 |
| 2026-08-11 00:00 |
10:43:22.38 |
-39:59:12.2 |
HIP 52367 |
22.14 |
| 2026-08-11 12:00 |
10:43:30.59 |
-39:58:54.7 |
HIP 52367 |
22.92 |
| 2026-08-12 00:00 |
10:43:38.82 |
-39:58:38.0 |
HIP 52367 |
23.79 |
| 2026-08-12 12:00 |
10:43:47.07 |
-39:58:21.8 |
HIP 52583 |
23.24 |
| 2026-08-13 00:00 |
10:43:55.34 |
-39:58:06.4 |
HIP 52583 |
22.41 |
| 2026-08-13 12:00 |
10:44:03.62 |
-39:57:51.6 |
HIP 52583 |
21.66 |
| 2026-08-14 00:00 |
10:44:11.92 |
-39:57:37.5 |
HIP 52583 |
20.99 |
| 2026-08-14 12:00 |
10:44:20.24 |
-39:57:24.0 |
HIP 52583 |
20.41 |
| 2026-08-15 00:00 |
10:44:28.57 |
-39:57:11.2 |
HIP 52583 |
19.94 |
| 2026-08-15 12:00 |
10:44:36.91 |
-39:56:59.1 |
HIP 52583 |
19.58 |
| 2026-08-16 00:00 |
10:44:45.27 |
-39:56:47.6 |
HIP 52583 |
19.33 |
| 2026-08-16 12:00 |
10:44:53.64 |
-39:56:36.8 |
HIP 52583 |
19.20 |
| 2026-08-17 00:00 |
10:45:02.03 |
-39:56:26.7 |
HIP 52583 |
19.20 |
| 2026-08-17 12:00 |
10:45:10.43 |
-39:56:17.2 |
HIP 52583 |
19.32 |
| 2026-08-18 00:00 |
10:45:18.84 |
-39:56:08.3 |
HIP 52583 |
19.56 |
| 2026-08-18 12:00 |
10:45:27.26 |
-39:56:00.1 |
HIP 52583 |
19.92 |
| 2026-08-19 00:00 |
10:45:35.70 |
-39:55:52.6 |
HIP 52583 |
20.39 |