C/2020 Q1 (Borisov)
メタデータ
| 項目 |
値 |
| Designation |
C/2020 Q1 (Borisov) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2020-08-14T15:47:50.138880Z |
| Orbit solution date (soln_date, UTC) |
2022-06-07T21:44:52Z |
| Obs used |
280 |
| NEO |
- |
| M1 |
11.700 |
| K1 |
41.250 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2020-08-17T23:14:45.312000Z |
| Discovery magnitude (MPC) |
17.80 R |
| Discovery observatory (MPC) |
L51 · MARGO, Nauchnyi |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2020-09-06.0000000 |
| e |
0.97788684 |
| q (au) |
1.314974 |
| a (au) |
59.465667 |
| i (deg) |
142.923814 |
| Ω (om, deg) |
52.379273 |
| ω (w, deg) |
9.884895 |
| M (ma, deg) |
0.048020 |
等級
散乱 + 全体線形
$$
M_a = (15.650 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
15.650 |
| n |
6.000 |
| gf |
0.997 |
| gb |
-1.000 |
| k |
0.800 |
| 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) |
| 2026-02-03 00:00 |
16:52:46.33 |
-10:03:11.2 |
HIP 82642 |
43.62 |
| 2026-02-03 12:00 |
16:52:49.38 |
-10:03:01.7 |
HIP 82642 |
43.58 |
| 2026-02-04 00:00 |
16:52:52.37 |
-10:02:52.1 |
HIP 82642 |
43.55 |
| 2026-02-04 12:00 |
16:52:55.31 |
-10:02:42.3 |
HIP 82642 |
43.55 |
| 2026-02-05 00:00 |
16:52:58.20 |
-10:02:32.3 |
HIP 82642 |
43.56 |
| 2026-02-05 12:00 |
16:53:01.03 |
-10:02:22.0 |
HIP 82642 |
43.60 |
| 2026-02-06 00:00 |
16:53:03.80 |
-10:02:11.6 |
HIP 82642 |
43.65 |
| 2026-02-06 12:00 |
16:53:06.52 |
-10:02:01.0 |
HIP 82642 |
43.71 |
| 2026-02-07 00:00 |
16:53:09.19 |
-10:01:50.1 |
HIP 82642 |
43.79 |
| 2026-02-07 12:00 |
16:53:11.79 |
-10:01:39.1 |
HIP 82642 |
43.89 |
| 2026-02-08 00:00 |
16:53:14.34 |
-10:01:27.8 |
HIP 82642 |
44.01 |
| 2026-02-08 12:00 |
16:53:16.83 |
-10:01:16.4 |
HIP 82642 |
44.13 |
| 2026-02-09 00:00 |
16:53:19.27 |
-10:01:04.8 |
HIP 82642 |
44.27 |
| 2026-02-09 12:00 |
16:53:21.64 |
-10:00:52.9 |
HIP 82642 |
44.42 |
| 2026-02-10 00:00 |
16:53:23.96 |
-10:00:40.9 |
HIP 82788 |
44.51 |
| 2026-02-10 12:00 |
16:53:26.22 |
-10:00:28.7 |
HIP 82788 |
44.02 |
| 2026-02-11 00:00 |
16:53:28.42 |
-10:00:16.3 |
HIP 82788 |
43.55 |
| 2026-02-11 12:00 |
16:53:30.57 |
-10:00:03.7 |
HIP 82788 |
43.08 |
| 2026-02-12 00:00 |
16:53:32.65 |
-09:59:50.9 |
HIP 82788 |
42.62 |
| 2026-02-12 12:00 |
16:53:34.67 |
-09:59:37.9 |
HIP 82788 |
42.17 |
| 2026-02-13 00:00 |
16:53:36.64 |
-09:59:24.7 |
HIP 82788 |
41.72 |
| 2026-02-13 12:00 |
16:53:38.54 |
-09:59:11.3 |
HIP 82788 |
41.28 |
| 2026-02-14 00:00 |
16:53:40.39 |
-09:58:57.8 |
HIP 82788 |
40.85 |
| 2026-02-14 12:00 |
16:53:42.17 |
-09:58:44.1 |
HIP 82788 |
40.43 |
| 2026-02-15 00:00 |
16:53:43.89 |
-09:58:30.1 |
HIP 82788 |
40.01 |
| 2026-02-15 12:00 |
16:53:45.55 |
-09:58:16.0 |
HIP 82788 |
39.60 |
| 2026-02-16 00:00 |
16:53:47.15 |
-09:58:01.8 |
HIP 82788 |
39.19 |
| 2026-02-16 12:00 |
16:53:48.69 |
-09:57:47.3 |
HIP 82788 |
38.80 |
| 2026-02-17 00:00 |
16:53:50.16 |
-09:57:32.7 |
HIP 82788 |
38.40 |
| 2026-02-17 12:00 |
16:53:51.57 |
-09:57:17.8 |
HIP 82788 |
38.02 |
| 2026-02-18 00:00 |
16:53:52.93 |
-09:57:02.8 |
HIP 82788 |
37.64 |
| 2026-02-18 12:00 |
16:53:54.21 |
-09:56:47.7 |
HIP 82788 |
37.26 |
| 2026-02-19 00:00 |
16:53:55.44 |
-09:56:32.3 |
HIP 82788 |
36.89 |
| 2026-02-19 12:00 |
16:53:56.60 |
-09:56:16.8 |
HIP 82788 |
36.53 |
| 2026-02-20 00:00 |
16:53:57.70 |
-09:56:01.2 |
HIP 82788 |
36.17 |
| 2026-02-20 12:00 |
16:53:58.74 |
-09:55:45.3 |
HIP 82788 |
35.82 |
| 2026-02-21 00:00 |
16:53:59.71 |
-09:55:29.3 |
HIP 82788 |
35.47 |
| 2026-02-21 12:00 |
16:54:00.62 |
-09:55:13.2 |
HIP 82788 |
35.13 |
| 2026-02-22 00:00 |
16:54:01.46 |
-09:54:56.8 |
HIP 82788 |
34.79 |
| 2026-02-22 12:00 |
16:54:02.24 |
-09:54:40.3 |
HIP 82788 |
34.46 |
| 2026-02-23 00:00 |
16:54:02.96 |
-09:54:23.7 |
HIP 82788 |
34.13 |
| 2026-02-23 12:00 |
16:54:03.61 |
-09:54:06.9 |
HIP 82788 |
33.81 |
| 2026-02-24 00:00 |
16:54:04.20 |
-09:53:49.9 |
HIP 82788 |
33.49 |