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 · University of Arizona 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 |
-0.794 |
| 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) |
| 2026-09-20 00:00 |
05:57:22.12 |
-22:14:24.6 |
HIP 28132 |
8.84 |
| 2026-09-20 12:00 |
05:57:22.72 |
-22:15:49.9 |
HIP 28132 |
8.52 |
| 2026-09-21 00:00 |
05:57:23.27 |
-22:17:15.3 |
HIP 28132 |
8.41 |
| 2026-09-21 12:00 |
05:57:23.75 |
-22:18:40.8 |
HIP 28132 |
8.53 |
| 2026-09-22 00:00 |
05:57:24.16 |
-22:20:06.3 |
HIP 28132 |
8.86 |
| 2026-09-22 12:00 |
05:57:24.51 |
-22:21:31.8 |
HIP 28132 |
9.39 |
| 2026-09-23 00:00 |
05:57:24.79 |
-22:22:57.4 |
HIP 28132 |
10.08 |
| 2026-09-23 12:00 |
05:57:25.01 |
-22:24:23.0 |
HIP 28132 |
10.90 |
| 2026-09-24 00:00 |
05:57:25.16 |
-22:25:48.6 |
HIP 28132 |
11.83 |
| 2026-09-24 12:00 |
05:57:25.25 |
-22:27:14.2 |
HIP 28132 |
12.84 |
| 2026-09-25 00:00 |
05:57:25.28 |
-22:28:39.9 |
HIP 28219 |
13.83 |
| 2026-09-25 12:00 |
05:57:25.23 |
-22:30:05.6 |
HIP 28219 |
12.49 |
| 2026-09-26 00:00 |
05:57:25.13 |
-22:31:31.2 |
HIP 28219 |
11.17 |
| 2026-09-26 12:00 |
05:57:24.95 |
-22:32:56.9 |
HIP 28219 |
9.90 |
| 2026-09-27 00:00 |
05:57:24.72 |
-22:34:22.6 |
HIP 28219 |
8.69 |
| 2026-09-27 12:00 |
05:57:24.41 |
-22:35:48.2 |
HIP 28219 |
7.56 |
| 2026-09-28 00:00 |
05:57:24.04 |
-22:37:13.8 |
HIP 28219 |
6.56 |
| 2026-09-28 12:00 |
05:57:23.61 |
-22:38:39.5 |
HIP 28219 |
5.75 |
| 2026-09-29 00:00 |
05:57:23.11 |
-22:40:05.0 |
HIP 28219 |
5.24 |
| 2026-09-29 12:00 |
05:57:22.55 |
-22:41:30.6 |
HIP 28219 |
5.10 |
| 2026-09-30 00:00 |
05:57:21.91 |
-22:42:56.1 |
HIP 28219 |
5.38 |
| 2026-09-30 12:00 |
05:57:21.22 |
-22:44:21.6 |
HIP 28219 |
6.00 |
| 2026-10-01 00:00 |
05:57:20.46 |
-22:45:47.0 |
HIP 28219 |
6.89 |
| 2026-10-01 12:00 |
05:57:19.63 |
-22:47:12.4 |
HIP 28219 |
7.94 |
| 2026-10-02 00:00 |
05:57:18.73 |
-22:48:37.7 |
HIP 28219 |
9.11 |
| 2026-10-02 12:00 |
05:57:17.77 |
-22:50:02.9 |
HIP 28219 |
10.36 |
| 2026-10-03 00:00 |
05:57:16.75 |
-22:51:28.1 |
HIP 28219 |
11.66 |
| 2026-10-03 12:00 |
05:57:15.65 |
-22:52:53.2 |
HIP 28219 |
12.99 |
| 2026-10-04 00:00 |
05:57:14.50 |
-22:54:18.2 |
HIP 28219 |
14.35 |
| 2026-10-04 12:00 |
05:57:13.27 |
-22:55:43.1 |
HIP 28085 |
14.61 |
| 2026-10-05 00:00 |
05:57:11.98 |
-22:57:07.9 |
HIP 28085 |
14.91 |
| 2026-10-05 12:00 |
05:57:10.63 |
-22:58:32.6 |
HIP 28085 |
15.33 |
| 2026-10-06 00:00 |
05:57:09.20 |
-22:59:57.3 |
HIP 28118 |
15.24 |
| 2026-10-06 12:00 |
05:57:07.71 |
-23:01:21.7 |
HIP 28118 |
13.86 |
| 2026-10-07 00:00 |
05:57:06.16 |
-23:02:46.1 |
HIP 28118 |
12.50 |
| 2026-10-07 12:00 |
05:57:04.54 |
-23:04:10.4 |
HIP 28118 |
11.16 |
| 2026-10-08 00:00 |
05:57:02.85 |
-23:05:34.5 |
HIP 28118 |
9.83 |
| 2026-10-08 12:00 |
05:57:01.10 |
-23:06:58.4 |
HIP 28118 |
8.54 |
| 2026-10-09 00:00 |
05:56:59.28 |
-23:08:22.3 |
HIP 28118 |
7.30 |
| 2026-10-09 12:00 |
05:56:57.40 |
-23:09:45.9 |
HIP 28118 |
6.15 |
| 2026-10-10 00:00 |
05:56:55.45 |
-23:11:09.4 |
HIP 28118 |
5.14 |
| 2026-10-10 12:00 |
05:56:53.43 |
-23:12:32.8 |
HIP 28118 |
4.38 |
| 2026-10-11 00:00 |
05:56:51.35 |
-23:13:55.9 |
HIP 28118 |
4.02 |