メタデータ
| 項目 |
値 |
| Designation |
C/2015 D4 (Borisov) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2014-10-28T05:41:47.852160Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:07Z |
| Obs used |
51 |
| NEO |
- |
| M1 |
9.200 |
| K1 |
16.500 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2015-03-30.0000000 |
| e |
0.98906756 |
| q (au) |
0.861677 |
| a (au) |
78.818308 |
| i (deg) |
77.301723 |
| Ω (om, deg) |
305.810298 |
| ω (w, deg) |
314.694165 |
| M (ma, deg) |
0.215169 |
等級
散乱 + 全体線形
$$
M_a = (9.234 + 5.834\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
9.234 |
| n |
5.834 |
| gf |
1.000 |
| gb |
-1.000 |
| 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) |
| 2026-03-26 00:00 |
08:14:50.69 |
+84:10:51.6 |
HIP 40559 |
8.04 |
| 2026-03-26 12:00 |
08:14:31.66 |
+84:09:57.2 |
HIP 40559 |
7.45 |
| 2026-03-27 00:00 |
08:14:13.06 |
+84:09:02.5 |
HIP 40559 |
6.94 |
| 2026-03-27 12:00 |
08:13:54.90 |
+84:08:07.6 |
HIP 40559 |
6.55 |
| 2026-03-28 00:00 |
08:13:37.17 |
+84:07:12.4 |
HIP 40559 |
6.30 |
| 2026-03-28 12:00 |
08:13:19.88 |
+84:06:16.9 |
HIP 40559 |
6.20 |
| 2026-03-29 00:00 |
08:13:03.02 |
+84:05:21.1 |
HIP 40559 |
6.25 |
| 2026-03-29 12:00 |
08:12:46.58 |
+84:04:25.1 |
HIP 40559 |
6.47 |
| 2026-03-30 00:00 |
08:12:30.58 |
+84:03:28.9 |
HIP 40559 |
6.82 |
| 2026-03-30 12:00 |
08:12:15.00 |
+84:02:32.4 |
HIP 40559 |
7.29 |
| 2026-03-31 00:00 |
08:11:59.84 |
+84:01:35.6 |
HIP 40559 |
7.86 |
| 2026-03-31 12:00 |
08:11:45.10 |
+84:00:38.7 |
HIP 40559 |
8.51 |
| 2026-04-01 00:00 |
08:11:30.77 |
+83:59:41.5 |
HIP 40559 |
9.21 |
| 2026-04-01 12:00 |
08:11:16.87 |
+83:58:44.1 |
HIP 40559 |
9.97 |
| 2026-04-02 00:00 |
08:11:03.37 |
+83:57:46.4 |
HIP 40559 |
10.77 |
| 2026-04-02 12:00 |
08:10:50.29 |
+83:56:48.6 |
HIP 40559 |
11.60 |
| 2026-04-03 00:00 |
08:10:37.62 |
+83:55:50.6 |
HIP 40559 |
12.45 |
| 2026-04-03 12:00 |
08:10:25.35 |
+83:54:52.3 |
HIP 40559 |
13.32 |
| 2026-04-04 00:00 |
08:10:13.49 |
+83:53:53.9 |
HIP 40559 |
14.20 |
| 2026-04-04 12:00 |
08:10:02.02 |
+83:52:55.3 |
HIP 40559 |
15.10 |
| 2026-04-05 00:00 |
08:09:50.96 |
+83:51:56.5 |
HIP 40559 |
16.01 |
| 2026-04-05 12:00 |
08:09:40.30 |
+83:50:57.5 |
HIP 40559 |
16.93 |
| 2026-04-06 00:00 |
08:09:30.02 |
+83:49:58.4 |
HIP 40559 |
17.86 |
| 2026-04-06 12:00 |
08:09:20.14 |
+83:48:59.1 |
HIP 40559 |
18.79 |
| 2026-04-07 00:00 |
08:09:10.65 |
+83:47:59.6 |
HIP 40559 |
19.73 |
| 2026-04-07 12:00 |
08:09:01.55 |
+83:47:00.0 |
HIP 40559 |
20.67 |
| 2026-04-08 00:00 |
08:08:52.83 |
+83:46:00.3 |
HIP 40559 |
21.62 |
| 2026-04-08 12:00 |
08:08:44.50 |
+83:45:00.4 |
HIP 40559 |
22.57 |
| 2026-04-09 00:00 |
08:08:36.54 |
+83:44:00.3 |
HIP 40559 |
23.52 |
| 2026-04-09 12:00 |
08:08:28.97 |
+83:43:00.2 |
HIP 40559 |
24.48 |
| 2026-04-10 00:00 |
08:08:21.76 |
+83:41:59.9 |
HIP 40559 |
25.44 |
| 2026-04-10 12:00 |
08:08:14.93 |
+83:40:59.4 |
HIP 38485 |
25.84 |
| 2026-04-11 00:00 |
08:08:08.47 |
+83:39:58.9 |
HIP 38485 |
25.95 |
| 2026-04-11 12:00 |
08:08:02.38 |
+83:38:58.2 |
HIP 38485 |
26.11 |
| 2026-04-12 00:00 |
08:07:56.65 |
+83:37:57.5 |
HIP 38485 |
26.31 |
| 2026-04-12 12:00 |
08:07:51.28 |
+83:36:56.6 |
HIP 38485 |
26.57 |
| 2026-04-13 00:00 |
08:07:46.27 |
+83:35:55.6 |
HIP 38485 |
26.87 |
| 2026-04-13 12:00 |
08:07:41.62 |
+83:34:54.6 |
HIP 38485 |
27.21 |
| 2026-04-14 00:00 |
08:07:37.33 |
+83:33:53.4 |
HIP 38485 |
27.60 |
| 2026-04-14 12:00 |
08:07:33.39 |
+83:32:52.2 |
HIP 38485 |
28.02 |
| 2026-04-15 00:00 |
08:07:29.79 |
+83:31:50.9 |
HIP 38485 |
28.49 |
| 2026-04-15 12:00 |
08:07:26.54 |
+83:30:49.5 |
HIP 38485 |
28.99 |
| 2026-04-16 00:00 |
08:07:23.64 |
+83:29:48.1 |
HIP 38485 |
29.53 |