メタデータ
| 項目 |
値 |
| Designation |
C/2016 X1 (Lemmon) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2019-04-29T21:10:40.776960Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:28Z |
| Obs used |
289 |
| NEO |
- |
| M1 |
6.600 |
| K1 |
9.250 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2018-09-28.0000000 |
| e |
0.99625285 |
| q (au) |
7.564181 |
| a (au) |
2018.648757 |
| i (deg) |
26.455050 |
| Ω (om, deg) |
256.425245 |
| ω (w, deg) |
224.569464 |
| M (ma, deg) |
359.997676 |
等級
散乱 + 全体線形
$$
M_a = (0.331 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
0.331 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.740 |
| 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) |
| 2026-06-01 00:00 |
13:51:02.86 |
-30:27:04.7 |
HIP 67604 |
7.01 |
| 2026-06-01 12:00 |
13:50:58.82 |
-30:26:13.5 |
HIP 67604 |
8.04 |
| 2026-06-02 00:00 |
13:50:54.83 |
-30:25:22.3 |
HIP 67550 |
8.00 |
| 2026-06-02 12:00 |
13:50:50.89 |
-30:24:31.1 |
HIP 67550 |
6.80 |
| 2026-06-03 00:00 |
13:50:47.00 |
-30:23:39.9 |
HIP 67550 |
5.60 |
| 2026-06-03 12:00 |
13:50:43.16 |
-30:22:48.8 |
HIP 67550 |
4.41 |
| 2026-06-04 00:00 |
13:50:39.37 |
-30:21:57.7 |
HIP 67550 |
3.23 |
| 2026-06-04 12:00 |
13:50:35.63 |
-30:21:06.6 |
HIP 67550 |
2.06 |
| 2026-06-05 00:00 |
13:50:31.94 |
-30:20:15.5 |
HIP 67550 |
0.89 |
| 2026-06-05 12:00 |
13:50:28.31 |
-30:19:24.5 |
HIP 67550 |
0.28 |
| 2026-06-06 00:00 |
13:50:24.72 |
-30:18:33.5 |
HIP 67550 |
1.42 |
| 2026-06-06 12:00 |
13:50:21.19 |
-30:17:42.6 |
HIP 67550 |
2.56 |
| 2026-06-07 00:00 |
13:50:17.71 |
-30:16:51.7 |
HIP 67550 |
3.69 |
| 2026-06-07 12:00 |
13:50:14.29 |
-30:16:00.8 |
HIP 67550 |
4.81 |
| 2026-06-08 00:00 |
13:50:10.92 |
-30:15:10.1 |
HIP 67550 |
5.93 |
| 2026-06-08 12:00 |
13:50:07.60 |
-30:14:19.3 |
HIP 67561 |
6.97 |
| 2026-06-09 00:00 |
13:50:04.33 |
-30:13:28.7 |
HIP 67561 |
7.85 |
| 2026-06-09 12:00 |
13:50:01.12 |
-30:12:38.1 |
HIP 67561 |
8.78 |
| 2026-06-10 00:00 |
13:49:57.97 |
-30:11:47.6 |
HIP 67561 |
9.73 |
| 2026-06-10 12:00 |
13:49:54.87 |
-30:10:57.2 |
HIP 67561 |
10.69 |
| 2026-06-11 00:00 |
13:49:51.82 |
-30:10:06.9 |
HIP 67561 |
11.66 |
| 2026-06-11 12:00 |
13:49:48.83 |
-30:09:16.6 |
HIP 67561 |
12.64 |
| 2026-06-12 00:00 |
13:49:45.90 |
-30:08:26.5 |
HIP 67561 |
13.61 |
| 2026-06-12 12:00 |
13:49:43.02 |
-30:07:36.4 |
HIP 67561 |
14.59 |
| 2026-06-13 00:00 |
13:49:40.20 |
-30:06:46.4 |
HIP 67561 |
15.56 |
| 2026-06-13 12:00 |
13:49:37.44 |
-30:05:56.6 |
HIP 67561 |
16.53 |
| 2026-06-14 00:00 |
13:49:34.73 |
-30:05:06.9 |
HIP 67561 |
17.50 |
| 2026-06-14 12:00 |
13:49:32.08 |
-30:04:17.2 |
HIP 67561 |
18.46 |
| 2026-06-15 00:00 |
13:49:29.49 |
-30:03:27.7 |
HIP 67561 |
19.41 |
| 2026-06-15 12:00 |
13:49:26.96 |
-30:02:38.4 |
HIP 67561 |
20.36 |
| 2026-06-16 00:00 |
13:49:24.48 |
-30:01:49.1 |
HIP 67561 |
21.30 |
| 2026-06-16 12:00 |
13:49:22.06 |
-30:01:00.0 |
HIP 67561 |
22.23 |
| 2026-06-17 00:00 |
13:49:19.71 |
-30:00:11.0 |
HIP 67406 |
21.31 |
| 2026-06-17 12:00 |
13:49:17.41 |
-29:59:22.2 |
HIP 67406 |
20.39 |
| 2026-06-18 00:00 |
13:49:15.17 |
-29:58:33.5 |
HIP 67406 |
19.49 |
| 2026-06-18 12:00 |
13:49:12.99 |
-29:57:45.0 |
HIP 67406 |
18.59 |
| 2026-06-19 00:00 |
13:49:10.87 |
-29:56:56.6 |
HIP 67406 |
17.70 |
| 2026-06-19 12:00 |
13:49:08.81 |
-29:56:08.4 |
HIP 67406 |
16.82 |
| 2026-06-20 00:00 |
13:49:06.81 |
-29:55:20.3 |
HIP 67406 |
15.95 |
| 2026-06-20 12:00 |
13:49:04.87 |
-29:54:32.4 |
HIP 67406 |
15.09 |
| 2026-06-21 00:00 |
13:49:02.99 |
-29:53:44.7 |
HIP 67406 |
14.24 |
| 2026-06-21 12:00 |
13:49:01.17 |
-29:52:57.1 |
HIP 67406 |
13.40 |
| 2026-06-22 00:00 |
13:48:59.41 |
-29:52:09.7 |
HIP 67406 |
12.57 |