メタデータ
| 項目 |
値 |
| Designation |
P/2018 C1 (Lemmon-Read) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2018-02-25T13:35:25.753920Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:40Z |
| Obs used |
121 |
| NEO |
- |
| M1 |
14.000 |
| K1 |
10.000 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2018-03-01.0000000 |
| e |
0.53445831 |
| q (au) |
2.595759 |
| a (au) |
5.575781 |
| i (deg) |
5.133510 |
| Ω (om, deg) |
270.449437 |
| ω (w, deg) |
234.329129 |
| M (ma, deg) |
0.257046 |
等級
散乱 + 全体線形
$$
M_a = (11.162 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
11.162 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.882 |
| k |
1.000 |
| δ90 |
9.994 |
| 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 |
23:06:32.17 |
+00:06:52.0 |
HIP 114098 |
18.63 |
| 2026-07-29 12:00 |
23:06:24.65 |
+00:06:21.6 |
HIP 114098 |
18.23 |
| 2026-07-30 00:00 |
23:06:17.04 |
+00:05:50.5 |
HIP 114098 |
18.03 |
| 2026-07-30 12:00 |
23:06:09.34 |
+00:05:18.7 |
HIP 114098 |
18.04 |
| 2026-07-31 00:00 |
23:06:01.56 |
+00:04:46.2 |
HIP 114098 |
18.26 |
| 2026-07-31 12:00 |
23:05:53.69 |
+00:04:13.0 |
HIP 114098 |
18.71 |
| 2026-08-01 00:00 |
23:05:45.73 |
+00:03:39.2 |
HIP 114098 |
19.36 |
| 2026-08-01 12:00 |
23:05:37.68 |
+00:03:04.7 |
HIP 114098 |
20.22 |
| 2026-08-02 00:00 |
23:05:29.56 |
+00:02:29.5 |
HIP 114098 |
21.25 |
| 2026-08-02 12:00 |
23:05:21.34 |
+00:01:53.6 |
HIP 114098 |
22.45 |
| 2026-08-03 00:00 |
23:05:13.04 |
+00:01:17.1 |
HIP 114098 |
23.79 |
| 2026-08-03 12:00 |
23:05:04.66 |
+00:00:39.9 |
HIP 114098 |
25.25 |
| 2026-08-04 00:00 |
23:04:56.20 |
+00:00:02.1 |
HIP 114098 |
26.83 |
| 2026-08-04 12:00 |
23:04:47.66 |
-00:00:36.4 |
HIP 114098 |
28.51 |
| 2026-08-05 00:00 |
23:04:39.04 |
-00:01:15.5 |
HIP 114098 |
30.27 |
| 2026-08-05 12:00 |
23:04:30.33 |
-00:01:55.3 |
HIP 113834 |
31.45 |
| 2026-08-06 00:00 |
23:04:21.55 |
-00:02:35.8 |
HIP 113834 |
29.53 |
| 2026-08-06 12:00 |
23:04:12.69 |
-00:03:16.8 |
HIP 113834 |
27.65 |
| 2026-08-07 00:00 |
23:04:03.76 |
-00:03:58.5 |
HIP 113834 |
25.82 |
| 2026-08-07 12:00 |
23:03:54.75 |
-00:04:40.9 |
HIP 113834 |
24.06 |
| 2026-08-08 00:00 |
23:03:45.66 |
-00:05:23.9 |
HIP 113834 |
22.40 |
| 2026-08-08 12:00 |
23:03:36.50 |
-00:06:07.5 |
HIP 113834 |
20.86 |
| 2026-08-09 00:00 |
23:03:27.26 |
-00:06:51.7 |
HIP 113834 |
19.48 |
| 2026-08-09 12:00 |
23:03:17.96 |
-00:07:36.6 |
HIP 113834 |
18.30 |
| 2026-08-10 00:00 |
23:03:08.58 |
-00:08:22.0 |
HIP 113834 |
17.39 |
| 2026-08-10 12:00 |
23:02:59.13 |
-00:09:08.1 |
HIP 113834 |
16.77 |
| 2026-08-11 00:00 |
23:02:49.61 |
-00:09:54.8 |
HIP 113834 |
16.51 |
| 2026-08-11 12:00 |
23:02:40.03 |
-00:10:42.0 |
HIP 113834 |
16.62 |
| 2026-08-12 00:00 |
23:02:30.38 |
-00:11:29.9 |
HIP 113834 |
17.11 |
| 2026-08-12 12:00 |
23:02:20.66 |
-00:12:18.3 |
HIP 113834 |
17.96 |
| 2026-08-13 00:00 |
23:02:10.88 |
-00:13:07.3 |
HIP 113834 |
19.11 |
| 2026-08-13 12:00 |
23:02:01.03 |
-00:13:56.9 |
HIP 113834 |
20.54 |
| 2026-08-14 00:00 |
23:01:51.12 |
-00:14:47.1 |
HIP 113834 |
22.18 |
| 2026-08-14 12:00 |
23:01:41.16 |
-00:15:37.8 |
HIP 113773 |
23.22 |
| 2026-08-15 00:00 |
23:01:31.13 |
-00:16:29.1 |
HIP 113773 |
23.84 |
| 2026-08-15 12:00 |
23:01:21.04 |
-00:17:20.9 |
HIP 113672 |
24.64 |
| 2026-08-16 00:00 |
23:01:10.90 |
-00:18:13.3 |
HIP 113672 |
25.68 |
| 2026-08-16 12:00 |
23:01:00.70 |
-00:19:06.2 |
HIP 113672 |
26.97 |
| 2026-08-17 00:00 |
23:00:50.44 |
-00:19:59.6 |
HIP 113672 |
28.47 |
| 2026-08-17 12:00 |
23:00:40.13 |
-00:20:53.5 |
HIP 113478 |
26.88 |
| 2026-08-18 00:00 |
23:00:29.77 |
-00:21:48.0 |
HIP 113478 |
24.39 |
| 2026-08-18 12:00 |
23:00:19.36 |
-00:22:43.0 |
HIP 113478 |
21.94 |
| 2026-08-19 00:00 |
23:00:08.90 |
-00:23:38.4 |
HIP 113478 |
19.57 |