メタデータ
| 項目 |
値 |
| Designation |
C/2020 T5 (Lemmon) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2020-10-09T14:55:40.877760Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:34:15Z |
| Obs used |
111 |
| NEO |
- |
| M1 |
16.200 |
| K1 |
10.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2020-10-05T02:23:25.872000Z |
| Discovery magnitude (MPC) |
20.59 G |
| Discovery observatory (MPC) |
G96 · Mt. Lemmon Survey |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2020-10-12.0000000 |
| e |
0.99797054 |
| q (au) |
1.889011 |
| a (au) |
930.795662 |
| i (deg) |
66.603879 |
| Ω (om, deg) |
237.861698 |
| ω (w, deg) |
90.292383 |
| M (ma, deg) |
0.000083 |
等級
散乱 + 全体線形
$$
M_a = (15.381 + 4.112\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
15.381 |
| n |
4.112 |
| gf |
1.000 |
| gb |
-0.998 |
| 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 |
05:31:39.71 |
-19:34:42.1 |
HIP 26085 |
31.72 |
| 2026-05-12 12:00 |
05:31:46.61 |
-19:34:11.4 |
HIP 26085 |
30.01 |
| 2026-05-13 00:00 |
05:31:53.52 |
-19:33:41.1 |
HIP 26085 |
28.31 |
| 2026-05-13 12:00 |
05:32:00.47 |
-19:33:11.4 |
HIP 26085 |
26.60 |
| 2026-05-14 00:00 |
05:32:07.45 |
-19:32:42.1 |
HIP 26085 |
24.89 |
| 2026-05-14 12:00 |
05:32:14.45 |
-19:32:13.4 |
HIP 26085 |
23.17 |
| 2026-05-15 00:00 |
05:32:21.48 |
-19:31:45.2 |
HIP 26085 |
21.45 |
| 2026-05-15 12:00 |
05:32:28.53 |
-19:31:17.6 |
HIP 26085 |
19.72 |
| 2026-05-16 00:00 |
05:32:35.61 |
-19:30:50.4 |
HIP 26085 |
17.99 |
| 2026-05-16 12:00 |
05:32:42.72 |
-19:30:23.8 |
HIP 26085 |
16.26 |
| 2026-05-17 00:00 |
05:32:49.85 |
-19:29:57.7 |
HIP 26085 |
14.53 |
| 2026-05-17 12:00 |
05:32:57.00 |
-19:29:32.1 |
HIP 26085 |
12.79 |
| 2026-05-18 00:00 |
05:33:04.18 |
-19:29:07.0 |
HIP 26085 |
11.05 |
| 2026-05-18 12:00 |
05:33:11.39 |
-19:28:42.5 |
HIP 26085 |
9.31 |
| 2026-05-19 00:00 |
05:33:18.61 |
-19:28:18.5 |
HIP 26085 |
7.56 |
| 2026-05-19 12:00 |
05:33:25.86 |
-19:27:55.0 |
HIP 26085 |
5.82 |
| 2026-05-20 00:00 |
05:33:33.13 |
-19:27:32.1 |
HIP 26085 |
4.09 |
| 2026-05-20 12:00 |
05:33:40.43 |
-19:27:09.7 |
HIP 26085 |
2.40 |
| 2026-05-21 00:00 |
05:33:47.74 |
-19:26:47.9 |
HIP 26085 |
0.99 |
| 2026-05-21 12:00 |
05:33:55.08 |
-19:26:26.5 |
HIP 26085 |
1.56 |
| 2026-05-22 00:00 |
05:34:02.43 |
-19:26:05.8 |
HIP 26085 |
3.19 |
| 2026-05-22 12:00 |
05:34:09.81 |
-19:25:45.5 |
HIP 26085 |
4.92 |
| 2026-05-23 00:00 |
05:34:17.20 |
-19:25:25.8 |
HIP 26085 |
6.67 |
| 2026-05-23 12:00 |
05:34:24.61 |
-19:25:06.7 |
HIP 26085 |
8.44 |
| 2026-05-24 00:00 |
05:34:32.04 |
-19:24:48.0 |
HIP 26085 |
10.21 |
| 2026-05-24 12:00 |
05:34:39.49 |
-19:24:30.0 |
HIP 26085 |
11.99 |
| 2026-05-25 00:00 |
05:34:46.96 |
-19:24:12.4 |
HIP 26085 |
13.78 |
| 2026-05-25 12:00 |
05:34:54.44 |
-19:23:55.5 |
HIP 26085 |
15.56 |
| 2026-05-26 00:00 |
05:35:01.94 |
-19:23:39.0 |
HIP 26085 |
17.35 |
| 2026-05-26 12:00 |
05:35:09.46 |
-19:23:23.1 |
HIP 26085 |
19.14 |
| 2026-05-27 00:00 |
05:35:16.99 |
-19:23:07.8 |
HIP 26085 |
20.94 |
| 2026-05-27 12:00 |
05:35:24.54 |
-19:22:53.0 |
HIP 26085 |
22.73 |
| 2026-05-28 00:00 |
05:35:32.11 |
-19:22:38.7 |
HIP 26085 |
24.53 |
| 2026-05-28 12:00 |
05:35:39.68 |
-19:22:25.0 |
HIP 26085 |
26.34 |
| 2026-05-29 00:00 |
05:35:47.28 |
-19:22:11.9 |
HIP 26085 |
28.14 |
| 2026-05-29 12:00 |
05:35:54.88 |
-19:21:59.3 |
HIP 26085 |
29.95 |
| 2026-05-30 00:00 |
05:36:02.50 |
-19:21:47.2 |
HIP 26085 |
31.75 |
| 2026-05-30 12:00 |
05:36:10.13 |
-19:21:35.7 |
HIP 26376 |
32.15 |
| 2026-05-31 00:00 |
05:36:17.78 |
-19:21:24.8 |
HIP 26376 |
31.70 |
| 2026-05-31 12:00 |
05:36:25.44 |
-19:21:14.4 |
HIP 26376 |
31.35 |
| 2026-06-01 00:00 |
05:36:33.11 |
-19:21:04.5 |
HIP 26376 |
31.09 |
| 2026-06-01 12:00 |
05:36:40.79 |
-19:20:55.2 |
HIP 26376 |
30.92 |
| 2026-06-02 00:00 |
05:36:48.48 |
-19:20:46.5 |
HIP 26376 |
30.85 |