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) |
| 2026-06-01 00:00 |
18:22:01.88 |
-52:56:03.5 |
HIP 89864 |
17.11 |
| 2026-06-01 12:00 |
18:21:55.58 |
-52:56:22.8 |
HIP 89864 |
16.12 |
| 2026-06-02 00:00 |
18:21:49.26 |
-52:56:41.8 |
HIP 89864 |
15.12 |
| 2026-06-02 12:00 |
18:21:42.91 |
-52:57:00.6 |
HIP 89864 |
14.12 |
| 2026-06-03 00:00 |
18:21:36.53 |
-52:57:19.0 |
HIP 89864 |
13.13 |
| 2026-06-03 12:00 |
18:21:30.12 |
-52:57:37.2 |
HIP 89864 |
12.13 |
| 2026-06-04 00:00 |
18:21:23.68 |
-52:57:55.1 |
HIP 89864 |
11.14 |
| 2026-06-04 12:00 |
18:21:17.22 |
-52:58:12.8 |
HIP 89864 |
10.14 |
| 2026-06-05 00:00 |
18:21:10.74 |
-52:58:30.1 |
HIP 89864 |
9.16 |
| 2026-06-05 12:00 |
18:21:04.23 |
-52:58:47.1 |
HIP 89864 |
8.18 |
| 2026-06-06 00:00 |
18:20:57.69 |
-52:59:03.9 |
HIP 89864 |
7.21 |
| 2026-06-06 12:00 |
18:20:51.13 |
-52:59:20.4 |
HIP 89864 |
6.25 |
| 2026-06-07 00:00 |
18:20:44.55 |
-52:59:36.5 |
HIP 89864 |
5.33 |
| 2026-06-07 12:00 |
18:20:37.94 |
-52:59:52.4 |
HIP 89864 |
4.45 |
| 2026-06-08 00:00 |
18:20:31.31 |
-53:00:08.0 |
HIP 89864 |
3.65 |
| 2026-06-08 12:00 |
18:20:24.66 |
-53:00:23.3 |
HIP 89864 |
3.00 |
| 2026-06-09 00:00 |
18:20:17.99 |
-53:00:38.3 |
HIP 89864 |
2.61 |
| 2026-06-09 12:00 |
18:20:11.30 |
-53:00:53.0 |
HIP 89864 |
2.61 |
| 2026-06-10 00:00 |
18:20:04.59 |
-53:01:07.4 |
HIP 89864 |
3.00 |
| 2026-06-10 12:00 |
18:19:57.86 |
-53:01:21.5 |
HIP 89864 |
3.65 |
| 2026-06-11 00:00 |
18:19:51.11 |
-53:01:35.2 |
HIP 89864 |
4.46 |
| 2026-06-11 12:00 |
18:19:44.34 |
-53:01:48.7 |
HIP 89864 |
5.36 |
| 2026-06-12 00:00 |
18:19:37.55 |
-53:02:01.9 |
HIP 89864 |
6.30 |
| 2026-06-12 12:00 |
18:19:30.75 |
-53:02:14.8 |
HIP 89864 |
7.27 |
| 2026-06-13 00:00 |
18:19:23.93 |
-53:02:27.4 |
HIP 89864 |
8.26 |
| 2026-06-13 12:00 |
18:19:17.10 |
-53:02:39.6 |
HIP 89864 |
9.27 |
| 2026-06-14 00:00 |
18:19:10.25 |
-53:02:51.6 |
HIP 89864 |
10.29 |
| 2026-06-14 12:00 |
18:19:03.39 |
-53:03:03.2 |
HIP 89864 |
11.31 |
| 2026-06-15 00:00 |
18:18:56.51 |
-53:03:14.5 |
HIP 89864 |
12.35 |
| 2026-06-15 12:00 |
18:18:49.62 |
-53:03:25.6 |
HIP 89864 |
13.38 |
| 2026-06-16 00:00 |
18:18:42.72 |
-53:03:36.3 |
HIP 89864 |
14.42 |
| 2026-06-16 12:00 |
18:18:35.81 |
-53:03:46.7 |
HIP 89864 |
15.46 |
| 2026-06-17 00:00 |
18:18:28.88 |
-53:03:56.7 |
HIP 89864 |
16.51 |
| 2026-06-17 12:00 |
18:18:21.95 |
-53:04:06.5 |
HIP 89864 |
17.56 |
| 2026-06-18 00:00 |
18:18:15.01 |
-53:04:16.0 |
HIP 89864 |
18.61 |
| 2026-06-18 12:00 |
18:18:08.05 |
-53:04:25.1 |
HIP 89713 |
19.66 |
| 2026-06-19 00:00 |
18:18:01.09 |
-53:04:33.9 |
HIP 89713 |
20.03 |
| 2026-06-19 12:00 |
18:17:54.13 |
-53:04:42.4 |
HIP 89713 |
20.45 |
| 2026-06-20 00:00 |
18:17:47.15 |
-53:04:50.6 |
HIP 89713 |
20.90 |
| 2026-06-20 12:00 |
18:17:40.17 |
-53:04:58.5 |
HIP 89713 |
21.40 |
| 2026-06-21 00:00 |
18:17:33.19 |
-53:05:06.0 |
HIP 89713 |
21.93 |
| 2026-06-21 12:00 |
18:17:26.20 |
-53:05:13.2 |
HIP 89713 |
22.50 |
| 2026-06-22 00:00 |
18:17:19.20 |
-53:05:20.2 |
HIP 89713 |
23.09 |