メタデータ
| 項目 |
値 |
| Designation |
C/2018 DO4 (Lemmon) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2019-08-18T09:51:21.291840Z |
| Orbit solution date (soln_date, UTC) |
2022-06-28T08:33:35Z |
| Obs used |
660 |
| NEO |
- |
| M1 |
13.200 |
| K1 |
6.500 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2019-07-09.0000000 |
| e |
0.90695413 |
| q (au) |
2.405953 |
| a (au) |
25.857709 |
| i (deg) |
160.474821 |
| Ω (om, deg) |
251.132876 |
| ω (w, deg) |
175.974733 |
| M (ma, deg) |
359.697089 |
等級
散乱 + 全体線形
$$
M_a = (7.922 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
7.922 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.901 |
| k |
1.000 |
| 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) |
| 2026-07-29 00:00 |
19:33:26.75 |
-35:15:45.0 |
HIP 96113 |
16.16 |
| 2026-07-29 12:00 |
19:33:16.87 |
-35:15:53.0 |
HIP 96113 |
14.69 |
| 2026-07-30 00:00 |
19:33:07.00 |
-35:16:00.6 |
HIP 96113 |
13.38 |
| 2026-07-30 12:00 |
19:32:57.17 |
-35:16:08.0 |
HIP 96113 |
12.27 |
| 2026-07-31 00:00 |
19:32:47.35 |
-35:16:15.0 |
HIP 96113 |
11.41 |
| 2026-07-31 12:00 |
19:32:37.57 |
-35:16:21.8 |
HIP 96113 |
10.86 |
| 2026-08-01 00:00 |
19:32:27.81 |
-35:16:28.2 |
HIP 96113 |
10.67 |
| 2026-08-01 12:00 |
19:32:18.08 |
-35:16:34.4 |
HIP 96113 |
10.85 |
| 2026-08-02 00:00 |
19:32:08.38 |
-35:16:40.2 |
HIP 96113 |
11.39 |
| 2026-08-02 12:00 |
19:31:58.71 |
-35:16:45.7 |
HIP 96113 |
12.22 |
| 2026-08-03 00:00 |
19:31:49.06 |
-35:16:50.9 |
HIP 96113 |
13.30 |
| 2026-08-03 12:00 |
19:31:39.45 |
-35:16:55.9 |
HIP 96113 |
14.57 |
| 2026-08-04 00:00 |
19:31:29.87 |
-35:17:00.5 |
HIP 96113 |
15.97 |
| 2026-08-04 12:00 |
19:31:20.32 |
-35:17:04.8 |
HIP 96113 |
17.48 |
| 2026-08-05 00:00 |
19:31:10.81 |
-35:17:08.8 |
HIP 96113 |
19.06 |
| 2026-08-05 12:00 |
19:31:01.33 |
-35:17:12.5 |
HIP 96113 |
20.70 |
| 2026-08-06 00:00 |
19:30:51.88 |
-35:17:15.9 |
HIP 95921 |
21.53 |
| 2026-08-06 12:00 |
19:30:42.46 |
-35:17:19.0 |
HIP 95921 |
21.25 |
| 2026-08-07 00:00 |
19:30:33.09 |
-35:17:21.7 |
HIP 95921 |
21.13 |
| 2026-08-07 12:00 |
19:30:23.75 |
-35:17:24.2 |
HIP 95921 |
21.19 |
| 2026-08-08 00:00 |
19:30:14.44 |
-35:17:26.4 |
HIP 95921 |
21.41 |
| 2026-08-08 12:00 |
19:30:05.18 |
-35:17:28.3 |
HIP 95753 |
21.26 |
| 2026-08-09 00:00 |
19:29:55.95 |
-35:17:29.8 |
HIP 95753 |
19.61 |
| 2026-08-09 12:00 |
19:29:46.76 |
-35:17:31.1 |
HIP 95753 |
18.00 |
| 2026-08-10 00:00 |
19:29:37.61 |
-35:17:32.0 |
HIP 95753 |
16.46 |
| 2026-08-10 12:00 |
19:29:28.51 |
-35:17:32.7 |
HIP 95753 |
14.99 |
| 2026-08-11 00:00 |
19:29:19.44 |
-35:17:33.1 |
HIP 95753 |
13.62 |
| 2026-08-11 12:00 |
19:29:10.42 |
-35:17:33.1 |
HIP 95753 |
12.38 |
| 2026-08-12 00:00 |
19:29:01.44 |
-35:17:32.9 |
HIP 95753 |
11.30 |
| 2026-08-12 12:00 |
19:28:52.50 |
-35:17:32.3 |
HIP 95753 |
10.43 |
| 2026-08-13 00:00 |
19:28:43.61 |
-35:17:31.5 |
HIP 95753 |
9.83 |
| 2026-08-13 12:00 |
19:28:34.76 |
-35:17:30.3 |
HIP 95753 |
9.54 |
| 2026-08-14 00:00 |
19:28:25.96 |
-35:17:28.9 |
HIP 95731 |
9.55 |
| 2026-08-14 12:00 |
19:28:17.21 |
-35:17:27.1 |
HIP 95731 |
9.47 |
| 2026-08-15 00:00 |
19:28:08.50 |
-35:17:25.1 |
HIP 95731 |
9.73 |
| 2026-08-15 12:00 |
19:27:59.84 |
-35:17:22.8 |
HIP 95731 |
10.28 |
| 2026-08-16 00:00 |
19:27:51.23 |
-35:17:20.1 |
HIP 95731 |
11.07 |
| 2026-08-16 12:00 |
19:27:42.66 |
-35:17:17.2 |
HIP 95731 |
12.07 |
| 2026-08-17 00:00 |
19:27:34.15 |
-35:17:14.0 |
HIP 95731 |
13.21 |
| 2026-08-17 12:00 |
19:27:25.69 |
-35:17:10.5 |
HIP 95731 |
14.46 |
| 2026-08-18 00:00 |
19:27:17.27 |
-35:17:06.7 |
HIP 95731 |
15.79 |
| 2026-08-18 12:00 |
19:27:08.91 |
-35:17:02.6 |
HIP 95731 |
17.18 |
| 2026-08-19 00:00 |
19:27:00.60 |
-35:16:58.3 |
HIP 95731 |
18.60 |