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) |
| 2026-05-12 00:00 |
19:55:57.98 |
-34:10:15.8 |
HIP 98189 |
18.41 |
| 2026-05-12 12:00 |
19:55:53.14 |
-34:10:47.3 |
HIP 98189 |
18.97 |
| 2026-05-13 00:00 |
19:55:48.23 |
-34:11:18.8 |
HIP 98189 |
19.60 |
| 2026-05-13 12:00 |
19:55:43.25 |
-34:11:50.4 |
HIP 98189 |
20.28 |
| 2026-05-14 00:00 |
19:55:38.19 |
-34:12:22.1 |
HIP 98189 |
21.02 |
| 2026-05-14 12:00 |
19:55:33.06 |
-34:12:53.8 |
HIP 98189 |
21.81 |
| 2026-05-15 00:00 |
19:55:27.86 |
-34:13:25.6 |
HIP 97946 |
21.20 |
| 2026-05-15 12:00 |
19:55:22.59 |
-34:13:57.5 |
HIP 97946 |
20.08 |
| 2026-05-16 00:00 |
19:55:17.25 |
-34:14:29.4 |
HIP 97946 |
18.97 |
| 2026-05-16 12:00 |
19:55:11.83 |
-34:15:01.4 |
HIP 97946 |
17.85 |
| 2026-05-17 00:00 |
19:55:06.34 |
-34:15:33.5 |
HIP 97946 |
16.74 |
| 2026-05-17 12:00 |
19:55:00.79 |
-34:16:05.6 |
HIP 97946 |
15.65 |
| 2026-05-18 00:00 |
19:54:55.16 |
-34:16:37.7 |
HIP 97946 |
14.58 |
| 2026-05-18 12:00 |
19:54:49.46 |
-34:17:09.9 |
HIP 97946 |
13.53 |
| 2026-05-19 00:00 |
19:54:43.69 |
-34:17:42.2 |
HIP 97946 |
12.53 |
| 2026-05-19 12:00 |
19:54:37.86 |
-34:18:14.5 |
HIP 97946 |
11.58 |
| 2026-05-20 00:00 |
19:54:31.95 |
-34:18:46.8 |
HIP 97946 |
10.70 |
| 2026-05-20 12:00 |
19:54:25.97 |
-34:19:19.1 |
HIP 97946 |
9.93 |
| 2026-05-21 00:00 |
19:54:19.93 |
-34:19:51.5 |
HIP 97946 |
9.28 |
| 2026-05-21 12:00 |
19:54:13.82 |
-34:20:23.9 |
HIP 97946 |
8.80 |
| 2026-05-22 00:00 |
19:54:07.64 |
-34:20:56.4 |
HIP 97946 |
8.52 |
| 2026-05-22 12:00 |
19:54:01.39 |
-34:21:28.8 |
HIP 97946 |
8.47 |
| 2026-05-23 00:00 |
19:53:55.08 |
-34:22:01.3 |
HIP 97946 |
8.65 |
| 2026-05-23 12:00 |
19:53:48.70 |
-34:22:33.8 |
HIP 97946 |
9.05 |
| 2026-05-24 00:00 |
19:53:42.25 |
-34:23:06.3 |
HIP 97946 |
9.67 |
| 2026-05-24 12:00 |
19:53:35.74 |
-34:23:38.7 |
HIP 97946 |
10.45 |
| 2026-05-25 00:00 |
19:53:29.16 |
-34:24:11.2 |
HIP 97946 |
11.38 |
| 2026-05-25 12:00 |
19:53:22.52 |
-34:24:43.7 |
HIP 97946 |
12.43 |
| 2026-05-26 00:00 |
19:53:15.82 |
-34:25:16.2 |
HIP 97946 |
13.56 |
| 2026-05-26 12:00 |
19:53:09.04 |
-34:25:48.7 |
HIP 97946 |
14.77 |
| 2026-05-27 00:00 |
19:53:02.21 |
-34:26:21.2 |
HIP 97946 |
16.05 |
| 2026-05-27 12:00 |
19:52:55.31 |
-34:26:53.6 |
HIP 97946 |
17.37 |
| 2026-05-28 00:00 |
19:52:48.35 |
-34:27:26.1 |
HIP 97946 |
18.73 |
| 2026-05-28 12:00 |
19:52:41.33 |
-34:27:58.5 |
HIP 97946 |
20.14 |
| 2026-05-29 00:00 |
19:52:34.25 |
-34:28:30.9 |
HIP 97946 |
21.57 |
| 2026-05-29 12:00 |
19:52:27.10 |
-34:29:03.3 |
HIP 97946 |
23.03 |
| 2026-05-30 00:00 |
19:52:19.89 |
-34:29:35.6 |
HIP 97946 |
24.52 |
| 2026-05-30 12:00 |
19:52:12.62 |
-34:30:07.9 |
HIP 97604 |
25.72 |
| 2026-05-31 00:00 |
19:52:05.29 |
-34:30:40.2 |
HIP 97604 |
24.12 |
| 2026-05-31 12:00 |
19:51:57.91 |
-34:31:12.4 |
HIP 97604 |
22.51 |
| 2026-06-01 00:00 |
19:51:50.46 |
-34:31:44.6 |
HIP 97604 |
20.88 |
| 2026-06-01 12:00 |
19:51:42.95 |
-34:32:16.7 |
HIP 97604 |
19.25 |
| 2026-06-02 00:00 |
19:51:35.38 |
-34:32:48.8 |
HIP 97604 |
17.61 |