C/2013 V2 (Borisov)
メタデータ
| 項目 |
値 |
| Designation |
C/2013 V2 (Borisov) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2014-10-14T08:23:13.560000Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:42Z |
| Obs used |
1794 |
| NEO |
- |
| M1 |
6.600 |
| K1 |
12.000 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2014-08-22.0000000 |
| e |
1.00446231 |
| q (au) |
3.507923 |
| a (au) |
-786.122697 |
| i (deg) |
37.848377 |
| Ω (om, deg) |
48.435656 |
| ω (w, deg) |
94.462543 |
| M (ma, deg) |
-0.002386 |
等級
散乱 + 全体線形
$$
M_a = (9.199 + 2.863\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
9.199 |
| n |
2.863 |
| gf |
1.000 |
| gb |
-0.867 |
| 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) |
| 2026-02-03 00:00 |
18:22:08.70 |
-50:55:09.1 |
HIP 90073 |
7.29 |
| 2026-02-03 12:00 |
18:22:15.08 |
-50:55:30.3 |
HIP 90073 |
6.48 |
| 2026-02-04 00:00 |
18:22:21.43 |
-50:55:51.7 |
HIP 90073 |
5.76 |
| 2026-02-04 12:00 |
18:22:27.74 |
-50:56:13.3 |
HIP 90073 |
5.16 |
| 2026-02-05 00:00 |
18:22:34.01 |
-50:56:35.1 |
HIP 90073 |
4.74 |
| 2026-02-05 12:00 |
18:22:40.24 |
-50:56:57.1 |
HIP 90073 |
4.53 |
| 2026-02-06 00:00 |
18:22:46.44 |
-50:57:19.4 |
HIP 90073 |
4.56 |
| 2026-02-06 12:00 |
18:22:52.59 |
-50:57:41.8 |
HIP 90073 |
4.83 |
| 2026-02-07 00:00 |
18:22:58.71 |
-50:58:04.5 |
HIP 90073 |
5.30 |
| 2026-02-07 12:00 |
18:23:04.78 |
-50:58:27.3 |
HIP 90073 |
5.91 |
| 2026-02-08 00:00 |
18:23:10.82 |
-50:58:50.4 |
HIP 90073 |
6.63 |
| 2026-02-08 12:00 |
18:23:16.82 |
-50:59:13.7 |
HIP 90073 |
7.42 |
| 2026-02-09 00:00 |
18:23:22.77 |
-50:59:37.1 |
HIP 90073 |
8.26 |
| 2026-02-09 12:00 |
18:23:28.68 |
-51:00:00.8 |
HIP 90073 |
9.13 |
| 2026-02-10 00:00 |
18:23:34.55 |
-51:00:24.7 |
HIP 90171 |
8.45 |
| 2026-02-10 12:00 |
18:23:40.38 |
-51:00:48.8 |
HIP 90171 |
7.68 |
| 2026-02-11 00:00 |
18:23:46.17 |
-51:01:13.0 |
HIP 90171 |
6.97 |
| 2026-02-11 12:00 |
18:23:51.91 |
-51:01:37.5 |
HIP 90171 |
6.33 |
| 2026-02-12 00:00 |
18:23:57.61 |
-51:02:02.2 |
HIP 90171 |
5.78 |
| 2026-02-12 12:00 |
18:24:03.26 |
-51:02:27.1 |
HIP 90171 |
5.36 |
| 2026-02-13 00:00 |
18:24:08.87 |
-51:02:52.1 |
HIP 90171 |
5.10 |
| 2026-02-13 12:00 |
18:24:14.44 |
-51:03:17.4 |
HIP 90171 |
5.00 |
| 2026-02-14 00:00 |
18:24:19.96 |
-51:03:42.9 |
HIP 90171 |
5.08 |
| 2026-02-14 12:00 |
18:24:25.44 |
-51:04:08.5 |
HIP 90171 |
5.34 |
| 2026-02-15 00:00 |
18:24:30.87 |
-51:04:34.3 |
HIP 90171 |
5.73 |
| 2026-02-15 12:00 |
18:24:36.25 |
-51:05:00.4 |
HIP 90171 |
6.24 |
| 2026-02-16 00:00 |
18:24:41.59 |
-51:05:26.6 |
HIP 90171 |
6.84 |
| 2026-02-16 12:00 |
18:24:46.88 |
-51:05:53.0 |
HIP 90171 |
7.50 |
| 2026-02-17 00:00 |
18:24:52.12 |
-51:06:19.6 |
HIP 90171 |
8.21 |
| 2026-02-17 12:00 |
18:24:57.32 |
-51:06:46.4 |
HIP 90171 |
8.95 |
| 2026-02-18 00:00 |
18:25:02.46 |
-51:07:13.4 |
HIP 90171 |
9.71 |
| 2026-02-18 12:00 |
18:25:07.56 |
-51:07:40.5 |
HIP 90171 |
10.49 |
| 2026-02-19 00:00 |
18:25:12.61 |
-51:08:07.8 |
HIP 90171 |
11.29 |
| 2026-02-19 12:00 |
18:25:17.61 |
-51:08:35.3 |
HIP 90171 |
12.09 |
| 2026-02-20 00:00 |
18:25:22.57 |
-51:09:03.0 |
HIP 90171 |
12.90 |
| 2026-02-20 12:00 |
18:25:27.47 |
-51:09:30.9 |
HIP 90171 |
13.72 |
| 2026-02-21 00:00 |
18:25:32.32 |
-51:09:58.9 |
HIP 90340 |
13.89 |
| 2026-02-21 12:00 |
18:25:37.12 |
-51:10:27.1 |
HIP 90340 |
13.24 |
| 2026-02-22 00:00 |
18:25:41.87 |
-51:10:55.5 |
HIP 90340 |
12.62 |
| 2026-02-22 12:00 |
18:25:46.57 |
-51:11:24.1 |
HIP 90340 |
12.03 |
| 2026-02-23 00:00 |
18:25:51.22 |
-51:11:52.8 |
HIP 90340 |
11.48 |
| 2026-02-23 12:00 |
18:25:55.81 |
-51:12:21.7 |
HIP 90340 |
10.96 |
| 2026-02-24 00:00 |
18:26:00.36 |
-51:12:50.8 |
HIP 90340 |
10.49 |