C/2015 D4 (Borisov)
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) |
| 2026-02-03 00:00 |
09:21:31.36 |
+84:57:35.6 |
HIP 45088 |
21.10 |
| 2026-02-03 12:00 |
09:20:40.93 |
+84:57:44.0 |
HIP 45088 |
20.47 |
| 2026-02-04 00:00 |
09:19:50.44 |
+84:57:51.5 |
HIP 45088 |
19.86 |
| 2026-02-04 12:00 |
09:18:59.92 |
+84:57:58.2 |
HIP 45088 |
19.30 |
| 2026-02-05 00:00 |
09:18:09.36 |
+84:58:04.1 |
HIP 45088 |
18.78 |
| 2026-02-05 12:00 |
09:17:18.77 |
+84:58:09.2 |
HIP 45088 |
18.30 |
| 2026-02-06 00:00 |
09:16:28.17 |
+84:58:13.5 |
HIP 45088 |
17.87 |
| 2026-02-06 12:00 |
09:15:37.57 |
+84:58:17.0 |
HIP 45088 |
17.49 |
| 2026-02-07 00:00 |
09:14:46.97 |
+84:58:19.7 |
HIP 45088 |
17.17 |
| 2026-02-07 12:00 |
09:13:56.38 |
+84:58:21.6 |
HIP 45088 |
16.91 |
| 2026-02-08 00:00 |
09:13:05.83 |
+84:58:22.6 |
HIP 45088 |
16.70 |
| 2026-02-08 12:00 |
09:12:15.30 |
+84:58:22.9 |
HIP 45088 |
16.56 |
| 2026-02-09 00:00 |
09:11:24.83 |
+84:58:22.4 |
HIP 45088 |
16.48 |
| 2026-02-09 12:00 |
09:10:34.40 |
+84:58:21.0 |
HIP 45088 |
16.47 |
| 2026-02-10 00:00 |
09:09:44.05 |
+84:58:18.9 |
HIP 45088 |
16.52 |
| 2026-02-10 12:00 |
09:08:53.77 |
+84:58:15.9 |
HIP 45088 |
16.63 |
| 2026-02-11 00:00 |
09:08:03.57 |
+84:58:12.1 |
HIP 45088 |
16.81 |
| 2026-02-11 12:00 |
09:07:13.47 |
+84:58:07.6 |
HIP 45088 |
17.04 |
| 2026-02-12 00:00 |
09:06:23.48 |
+84:58:02.2 |
HIP 45088 |
17.34 |
| 2026-02-12 12:00 |
09:05:33.60 |
+84:57:56.1 |
HIP 45088 |
17.69 |
| 2026-02-13 00:00 |
09:04:43.85 |
+84:57:49.1 |
HIP 45088 |
18.09 |
| 2026-02-13 12:00 |
09:03:54.23 |
+84:57:41.4 |
HIP 43446 |
17.78 |
| 2026-02-14 00:00 |
09:03:04.75 |
+84:57:32.8 |
HIP 43446 |
16.81 |
| 2026-02-14 12:00 |
09:02:15.43 |
+84:57:23.5 |
HIP 43446 |
15.86 |
| 2026-02-15 00:00 |
09:01:26.28 |
+84:57:13.4 |
HIP 43446 |
14.93 |
| 2026-02-15 12:00 |
09:00:37.29 |
+84:57:02.5 |
HIP 43446 |
14.04 |
| 2026-02-16 00:00 |
08:59:48.49 |
+84:56:50.8 |
HIP 43446 |
13.18 |
| 2026-02-16 12:00 |
08:58:59.89 |
+84:56:38.4 |
HIP 43446 |
12.37 |
| 2026-02-17 00:00 |
08:58:11.48 |
+84:56:25.1 |
HIP 43446 |
11.61 |
| 2026-02-17 12:00 |
08:57:23.28 |
+84:56:11.1 |
HIP 43446 |
10.91 |
| 2026-02-18 00:00 |
08:56:35.30 |
+84:55:56.3 |
HIP 43446 |
10.29 |
| 2026-02-18 12:00 |
08:55:47.55 |
+84:55:40.8 |
HIP 43446 |
9.77 |
| 2026-02-19 00:00 |
08:55:00.04 |
+84:55:24.5 |
HIP 43446 |
9.34 |
| 2026-02-19 12:00 |
08:54:12.77 |
+84:55:07.5 |
HIP 43446 |
9.04 |
| 2026-02-20 00:00 |
08:53:25.75 |
+84:54:49.7 |
HIP 43446 |
8.88 |
| 2026-02-20 12:00 |
08:52:39.00 |
+84:54:31.1 |
HIP 43446 |
8.85 |
| 2026-02-21 00:00 |
08:51:52.52 |
+84:54:11.9 |
HIP 43446 |
8.96 |
| 2026-02-21 12:00 |
08:51:06.31 |
+84:53:51.8 |
HIP 43446 |
9.21 |
| 2026-02-22 00:00 |
08:50:20.39 |
+84:53:31.1 |
HIP 43446 |
9.58 |
| 2026-02-22 12:00 |
08:49:34.77 |
+84:53:09.6 |
HIP 43446 |
10.07 |
| 2026-02-23 00:00 |
08:48:49.44 |
+84:52:47.4 |
HIP 43446 |
10.65 |
| 2026-02-23 12:00 |
08:48:04.42 |
+84:52:24.5 |
HIP 42982 |
11.30 |
| 2026-02-24 00:00 |
08:47:19.71 |
+84:52:00.9 |
HIP 42982 |
10.66 |