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) |
| 2026-05-12 00:00 |
18:25:43.94 |
-52:39:43.3 |
HIP 90506 |
22.09 |
| 2026-05-12 12:00 |
18:25:39.23 |
-52:40:12.2 |
HIP 90506 |
22.68 |
| 2026-05-13 00:00 |
18:25:34.47 |
-52:40:41.0 |
HIP 90506 |
23.29 |
| 2026-05-13 12:00 |
18:25:29.66 |
-52:41:09.5 |
HIP 90341 |
23.12 |
| 2026-05-14 00:00 |
18:25:24.80 |
-52:41:37.8 |
HIP 90341 |
22.80 |
| 2026-05-14 12:00 |
18:25:19.90 |
-52:42:05.9 |
HIP 90341 |
22.52 |
| 2026-05-15 00:00 |
18:25:14.95 |
-52:42:33.9 |
HIP 90341 |
22.27 |
| 2026-05-15 12:00 |
18:25:09.95 |
-52:43:01.6 |
HIP 90341 |
22.06 |
| 2026-05-16 00:00 |
18:25:04.90 |
-52:43:29.1 |
HIP 90341 |
21.89 |
| 2026-05-16 12:00 |
18:24:59.81 |
-52:43:56.3 |
HIP 90341 |
21.77 |
| 2026-05-17 00:00 |
18:24:54.67 |
-52:44:23.4 |
HIP 90341 |
21.68 |
| 2026-05-17 12:00 |
18:24:49.49 |
-52:44:50.2 |
HIP 90341 |
21.64 |
| 2026-05-18 00:00 |
18:24:44.26 |
-52:45:16.9 |
HIP 90341 |
21.64 |
| 2026-05-18 12:00 |
18:24:38.99 |
-52:45:43.2 |
HIP 90341 |
21.68 |
| 2026-05-19 00:00 |
18:24:33.67 |
-52:46:09.4 |
HIP 90341 |
21.77 |
| 2026-05-19 12:00 |
18:24:28.31 |
-52:46:35.4 |
HIP 90341 |
21.91 |
| 2026-05-20 00:00 |
18:24:22.91 |
-52:47:01.1 |
HIP 90341 |
22.08 |
| 2026-05-20 12:00 |
18:24:17.47 |
-52:47:26.5 |
HIP 90341 |
22.31 |
| 2026-05-21 00:00 |
18:24:11.98 |
-52:47:51.8 |
HIP 90341 |
22.57 |
| 2026-05-21 12:00 |
18:24:06.46 |
-52:48:16.8 |
HIP 90341 |
22.88 |
| 2026-05-22 00:00 |
18:24:00.89 |
-52:48:41.5 |
HIP 90341 |
23.22 |
| 2026-05-22 12:00 |
18:23:55.29 |
-52:49:06.0 |
HIP 90341 |
23.61 |
| 2026-05-23 00:00 |
18:23:49.64 |
-52:49:30.3 |
HIP 90341 |
24.03 |
| 2026-05-23 12:00 |
18:23:43.96 |
-52:49:54.3 |
HIP 90341 |
24.49 |
| 2026-05-24 00:00 |
18:23:38.23 |
-52:50:18.1 |
HIP 90341 |
24.98 |
| 2026-05-24 12:00 |
18:23:32.47 |
-52:50:41.6 |
HIP 90341 |
25.51 |
| 2026-05-25 00:00 |
18:23:26.67 |
-52:51:04.9 |
HIP 90341 |
26.07 |
| 2026-05-25 12:00 |
18:23:20.84 |
-52:51:28.0 |
HIP 90341 |
26.65 |
| 2026-05-26 00:00 |
18:23:14.97 |
-52:51:50.7 |
HIP 90341 |
27.27 |
| 2026-05-26 12:00 |
18:23:09.06 |
-52:52:13.2 |
HIP 90341 |
27.91 |
| 2026-05-27 00:00 |
18:23:03.12 |
-52:52:35.5 |
HIP 89864 |
26.96 |
| 2026-05-27 12:00 |
18:22:57.14 |
-52:52:57.5 |
HIP 89864 |
25.98 |
| 2026-05-28 00:00 |
18:22:51.13 |
-52:53:19.2 |
HIP 89864 |
25.01 |
| 2026-05-28 12:00 |
18:22:45.09 |
-52:53:40.7 |
HIP 89864 |
24.03 |
| 2026-05-29 00:00 |
18:22:39.01 |
-52:54:01.9 |
HIP 89864 |
23.05 |
| 2026-05-29 12:00 |
18:22:32.90 |
-52:54:22.8 |
HIP 89864 |
22.06 |
| 2026-05-30 00:00 |
18:22:26.76 |
-52:54:43.5 |
HIP 89864 |
21.08 |
| 2026-05-30 12:00 |
18:22:20.58 |
-52:55:03.9 |
HIP 89864 |
20.09 |
| 2026-05-31 00:00 |
18:22:14.38 |
-52:55:24.0 |
HIP 89864 |
19.10 |
| 2026-05-31 12:00 |
18:22:08.14 |
-52:55:43.9 |
HIP 89864 |
18.11 |
| 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 |