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) |
| 2026-07-29 00:00 |
13:49:41.12 |
-29:05:17.7 |
HIP 67523 |
5.57 |
| 2026-07-29 12:00 |
13:49:43.98 |
-29:04:51.3 |
HIP 67523 |
4.93 |
| 2026-07-30 00:00 |
13:49:46.91 |
-29:04:25.4 |
HIP 67523 |
4.31 |
| 2026-07-30 12:00 |
13:49:49.89 |
-29:03:59.7 |
HIP 67523 |
3.74 |
| 2026-07-31 00:00 |
13:49:52.93 |
-29:03:34.5 |
HIP 67523 |
3.25 |
| 2026-07-31 12:00 |
13:49:56.03 |
-29:03:09.5 |
HIP 67523 |
2.87 |
| 2026-08-01 00:00 |
13:49:59.19 |
-29:02:45.0 |
HIP 67523 |
2.66 |
| 2026-08-01 12:00 |
13:50:02.41 |
-29:02:20.8 |
HIP 67523 |
2.68 |
| 2026-08-02 00:00 |
13:50:05.68 |
-29:01:56.9 |
HIP 67523 |
2.93 |
| 2026-08-02 12:00 |
13:50:09.01 |
-29:01:33.5 |
HIP 67523 |
3.36 |
| 2026-08-03 00:00 |
13:50:12.40 |
-29:01:10.3 |
HIP 67523 |
3.92 |
| 2026-08-03 12:00 |
13:50:15.84 |
-29:00:47.6 |
HIP 67523 |
4.56 |
| 2026-08-04 00:00 |
13:50:19.35 |
-29:00:25.2 |
HIP 67523 |
5.26 |
| 2026-08-04 12:00 |
13:50:22.91 |
-29:00:03.1 |
HIP 67523 |
6.00 |
| 2026-08-05 00:00 |
13:50:26.52 |
-28:59:41.5 |
HIP 67523 |
6.78 |
| 2026-08-05 12:00 |
13:50:30.19 |
-28:59:20.2 |
HIP 67523 |
7.58 |
| 2026-08-06 00:00 |
13:50:33.92 |
-28:58:59.2 |
HIP 67523 |
8.40 |
| 2026-08-06 12:00 |
13:50:37.71 |
-28:58:38.7 |
HIP 67523 |
9.23 |
| 2026-08-07 00:00 |
13:50:41.55 |
-28:58:18.5 |
HIP 67523 |
10.08 |
| 2026-08-07 12:00 |
13:50:45.44 |
-28:57:58.6 |
HIP 67523 |
10.95 |
| 2026-08-08 00:00 |
13:50:49.39 |
-28:57:39.2 |
HIP 67523 |
11.83 |
| 2026-08-08 12:00 |
13:50:53.40 |
-28:57:20.1 |
HIP 67661 |
11.70 |
| 2026-08-09 00:00 |
13:50:57.47 |
-28:57:01.3 |
HIP 67661 |
10.78 |
| 2026-08-09 12:00 |
13:51:01.58 |
-28:56:43.0 |
HIP 67661 |
9.86 |
| 2026-08-10 00:00 |
13:51:05.76 |
-28:56:25.0 |
HIP 67661 |
8.93 |
| 2026-08-10 12:00 |
13:51:09.98 |
-28:56:07.4 |
HIP 67661 |
7.99 |
| 2026-08-11 00:00 |
13:51:14.27 |
-28:55:50.2 |
HIP 67661 |
7.05 |
| 2026-08-11 12:00 |
13:51:18.60 |
-28:55:33.3 |
HIP 67661 |
6.12 |
| 2026-08-12 00:00 |
13:51:22.99 |
-28:55:16.9 |
HIP 67661 |
5.18 |
| 2026-08-12 12:00 |
13:51:27.44 |
-28:55:00.8 |
HIP 67661 |
4.27 |
| 2026-08-13 00:00 |
13:51:31.93 |
-28:54:45.0 |
HIP 67661 |
3.40 |
| 2026-08-13 12:00 |
13:51:36.48 |
-28:54:29.7 |
HIP 67661 |
2.63 |
| 2026-08-14 00:00 |
13:51:41.09 |
-28:54:14.7 |
HIP 67661 |
2.07 |
| 2026-08-14 12:00 |
13:51:45.75 |
-28:54:00.1 |
HIP 67661 |
1.95 |
| 2026-08-15 00:00 |
13:51:50.45 |
-28:53:45.9 |
HIP 67661 |
2.35 |
| 2026-08-15 12:00 |
13:51:55.22 |
-28:53:32.0 |
HIP 67661 |
3.07 |
| 2026-08-16 00:00 |
13:52:00.03 |
-28:53:18.6 |
HIP 67661 |
3.96 |
| 2026-08-16 12:00 |
13:52:04.89 |
-28:53:05.5 |
HIP 67661 |
4.94 |
| 2026-08-17 00:00 |
13:52:09.81 |
-28:52:52.8 |
HIP 67661 |
5.95 |
| 2026-08-17 12:00 |
13:52:14.78 |
-28:52:40.4 |
HIP 67661 |
7.00 |
| 2026-08-18 00:00 |
13:52:19.79 |
-28:52:28.5 |
HIP 67661 |
8.07 |
| 2026-08-18 12:00 |
13:52:24.86 |
-28:52:16.9 |
HIP 67661 |
9.16 |
| 2026-08-19 00:00 |
13:52:29.98 |
-28:52:05.7 |
HIP 67661 |
10.27 |