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) |
| 2026-09-20 00:00 |
22:48:16.14 |
-01:34:27.7 |
HIP 112520 |
17.32 |
| 2026-09-20 12:00 |
22:48:05.33 |
-01:35:38.9 |
HIP 112520 |
14.68 |
| 2026-09-21 00:00 |
22:47:54.57 |
-01:36:50.2 |
HIP 112520 |
12.18 |
| 2026-09-21 12:00 |
22:47:43.84 |
-01:38:01.3 |
HIP 112520 |
9.95 |
| 2026-09-22 00:00 |
22:47:33.17 |
-01:39:12.4 |
HIP 112520 |
8.16 |
| 2026-09-22 12:00 |
22:47:22.54 |
-01:40:23.4 |
HIP 112520 |
7.17 |
| 2026-09-23 00:00 |
22:47:11.95 |
-01:41:34.3 |
HIP 112520 |
7.27 |
| 2026-09-23 12:00 |
22:47:01.42 |
-01:42:45.1 |
HIP 112520 |
8.43 |
| 2026-09-24 00:00 |
22:46:50.93 |
-01:43:55.9 |
HIP 112520 |
10.28 |
| 2026-09-24 12:00 |
22:46:40.50 |
-01:45:06.5 |
HIP 112520 |
12.51 |
| 2026-09-25 00:00 |
22:46:30.11 |
-01:46:17.0 |
HIP 112520 |
14.94 |
| 2026-09-25 12:00 |
22:46:19.78 |
-01:47:27.3 |
HIP 112520 |
17.49 |
| 2026-09-26 00:00 |
22:46:09.51 |
-01:48:37.5 |
HIP 112520 |
20.09 |
| 2026-09-26 12:00 |
22:45:59.29 |
-01:49:47.6 |
HIP 112520 |
22.74 |
| 2026-09-27 00:00 |
22:45:49.12 |
-01:50:57.5 |
HIP 112520 |
25.41 |
| 2026-09-27 12:00 |
22:45:39.02 |
-01:52:07.2 |
HIP 112520 |
28.08 |
| 2026-09-28 00:00 |
22:45:28.97 |
-01:53:16.8 |
HIP 112310 |
29.10 |
| 2026-09-28 12:00 |
22:45:18.99 |
-01:54:26.2 |
HIP 112310 |
27.36 |
| 2026-09-29 00:00 |
22:45:09.07 |
-01:55:35.4 |
HIP 112310 |
25.80 |
| 2026-09-29 12:00 |
22:44:59.21 |
-01:56:44.5 |
HIP 112310 |
24.45 |
| 2026-09-30 00:00 |
22:44:49.41 |
-01:57:53.3 |
HIP 112310 |
23.35 |
| 2026-09-30 12:00 |
22:44:39.68 |
-01:59:01.9 |
HIP 112310 |
22.51 |
| 2026-10-01 00:00 |
22:44:30.02 |
-02:00:10.3 |
HIP 112310 |
21.98 |
| 2026-10-01 12:00 |
22:44:20.42 |
-02:01:18.4 |
HIP 112310 |
21.76 |
| 2026-10-02 00:00 |
22:44:10.89 |
-02:02:26.3 |
HIP 112310 |
21.85 |
| 2026-10-02 12:00 |
22:44:01.43 |
-02:03:34.0 |
HIP 112115 |
21.37 |
| 2026-10-03 00:00 |
22:43:52.05 |
-02:04:41.4 |
HIP 112115 |
19.11 |
| 2026-10-03 12:00 |
22:43:42.73 |
-02:05:48.6 |
HIP 112115 |
16.96 |
| 2026-10-04 00:00 |
22:43:33.49 |
-02:06:55.5 |
HIP 112115 |
14.98 |
| 2026-10-04 12:00 |
22:43:24.32 |
-02:08:02.1 |
HIP 112115 |
13.20 |
| 2026-10-05 00:00 |
22:43:15.23 |
-02:09:08.4 |
HIP 112115 |
11.73 |
| 2026-10-05 12:00 |
22:43:06.22 |
-02:10:14.4 |
HIP 112115 |
10.68 |
| 2026-10-06 00:00 |
22:42:57.28 |
-02:11:20.1 |
HIP 112115 |
10.15 |
| 2026-10-06 12:00 |
22:42:48.43 |
-02:12:25.5 |
HIP 112115 |
10.22 |
| 2026-10-07 00:00 |
22:42:39.65 |
-02:13:30.6 |
HIP 112115 |
10.86 |
| 2026-10-07 12:00 |
22:42:30.96 |
-02:14:35.4 |
HIP 112115 |
11.96 |
| 2026-10-08 00:00 |
22:42:22.35 |
-02:15:39.8 |
HIP 112115 |
13.41 |
| 2026-10-08 12:00 |
22:42:13.82 |
-02:16:43.9 |
HIP 112115 |
15.09 |
| 2026-10-09 00:00 |
22:42:05.38 |
-02:17:47.6 |
HIP 112043 |
16.74 |
| 2026-10-09 12:00 |
22:41:57.02 |
-02:18:51.0 |
HIP 112043 |
15.02 |
| 2026-10-10 00:00 |
22:41:48.75 |
-02:19:54.0 |
HIP 112043 |
13.49 |
| 2026-10-10 12:00 |
22:41:40.57 |
-02:20:56.6 |
HIP 112043 |
12.22 |
| 2026-10-11 00:00 |
22:41:32.48 |
-02:21:58.8 |
HIP 112043 |
11.28 |