メタデータ
| 項目 |
値 |
| Designation |
C/2017 E1 (Borisov) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2017-04-10T03:19:38.262720Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:31Z |
| Obs used |
183 |
| NEO |
- |
| M1 |
14.000 |
| K1 |
32.000 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2017-03-16.0000000 |
| e |
1.00257425 |
| q (au) |
0.900663 |
| a (au) |
-349.874391 |
| i (deg) |
14.554152 |
| Ω (om, deg) |
142.732826 |
| ω (w, deg) |
152.473457 |
| M (ma, deg) |
-0.003786 |
等級
散乱 + 全体線形
$$
M_a = (15.076 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
15.076 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
0.800 |
| 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
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) |
終了日 (UTC) |
a |
b |
| 2017-03-01 |
2017-04-09 |
+33.3745 |
-1.729 |
log10 r = log10(太陽距離/AU)、Δ = 地球距離(AU)
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
06:19:13.99 |
+12:37:41.1 |
HIP 30014 |
5.62 |
| 2026-07-29 12:00 |
06:19:18.27 |
+12:37:32.7 |
HIP 30014 |
6.43 |
| 2026-07-30 00:00 |
06:19:22.54 |
+12:37:24.3 |
HIP 30014 |
7.29 |
| 2026-07-30 12:00 |
06:19:26.78 |
+12:37:15.7 |
HIP 30014 |
8.19 |
| 2026-07-31 00:00 |
06:19:31.01 |
+12:37:07.1 |
HIP 30014 |
9.12 |
| 2026-07-31 12:00 |
06:19:35.21 |
+12:36:58.4 |
HIP 30014 |
10.07 |
| 2026-08-01 00:00 |
06:19:39.39 |
+12:36:49.6 |
HIP 30014 |
11.03 |
| 2026-08-01 12:00 |
06:19:43.55 |
+12:36:40.7 |
HIP 30014 |
12.00 |
| 2026-08-02 00:00 |
06:19:47.69 |
+12:36:31.7 |
HIP 30014 |
12.97 |
| 2026-08-02 12:00 |
06:19:51.81 |
+12:36:22.6 |
HIP 30025 |
13.94 |
| 2026-08-03 00:00 |
06:19:55.90 |
+12:36:13.5 |
HIP 30025 |
14.84 |
| 2026-08-03 12:00 |
06:19:59.97 |
+12:36:04.2 |
HIP 30025 |
15.74 |
| 2026-08-04 00:00 |
06:20:04.02 |
+12:35:54.9 |
HIP 30025 |
16.66 |
| 2026-08-04 12:00 |
06:20:08.04 |
+12:35:45.5 |
HIP 30025 |
17.57 |
| 2026-08-05 00:00 |
06:20:12.05 |
+12:35:36.0 |
HIP 30025 |
18.50 |
| 2026-08-05 12:00 |
06:20:16.02 |
+12:35:26.5 |
HIP 30025 |
19.42 |
| 2026-08-06 00:00 |
06:20:19.98 |
+12:35:16.8 |
HIP 30070 |
20.10 |
| 2026-08-06 12:00 |
06:20:23.91 |
+12:35:07.1 |
HIP 30070 |
20.43 |
| 2026-08-07 00:00 |
06:20:27.81 |
+12:34:57.3 |
HIP 30070 |
20.79 |
| 2026-08-07 12:00 |
06:20:31.69 |
+12:34:47.4 |
HIP 30070 |
21.19 |
| 2026-08-08 00:00 |
06:20:35.54 |
+12:34:37.5 |
HIP 30070 |
21.62 |
| 2026-08-08 12:00 |
06:20:39.37 |
+12:34:27.4 |
HIP 30070 |
22.08 |
| 2026-08-09 00:00 |
06:20:43.18 |
+12:34:17.3 |
HIP 30070 |
22.57 |
| 2026-08-09 12:00 |
06:20:46.96 |
+12:34:07.1 |
HIP 30245 |
22.58 |
| 2026-08-10 00:00 |
06:20:50.71 |
+12:33:56.9 |
HIP 30245 |
22.16 |
| 2026-08-10 12:00 |
06:20:54.43 |
+12:33:46.5 |
HIP 30245 |
21.77 |
| 2026-08-11 00:00 |
06:20:58.13 |
+12:33:36.1 |
HIP 30245 |
21.42 |
| 2026-08-11 12:00 |
06:21:01.80 |
+12:33:25.6 |
HIP 30245 |
21.10 |
| 2026-08-12 00:00 |
06:21:05.45 |
+12:33:15.1 |
HIP 30245 |
20.83 |
| 2026-08-12 12:00 |
06:21:09.06 |
+12:33:04.4 |
HIP 30245 |
20.60 |
| 2026-08-13 00:00 |
06:21:12.65 |
+12:32:53.7 |
HIP 30245 |
20.41 |
| 2026-08-13 12:00 |
06:21:16.21 |
+12:32:42.9 |
HIP 30318 |
19.63 |
| 2026-08-14 00:00 |
06:21:19.75 |
+12:32:32.1 |
HIP 30318 |
18.79 |
| 2026-08-14 12:00 |
06:21:23.25 |
+12:32:21.2 |
HIP 30318 |
17.95 |
| 2026-08-15 00:00 |
06:21:26.73 |
+12:32:10.2 |
HIP 30318 |
17.13 |
| 2026-08-15 12:00 |
06:21:30.17 |
+12:31:59.2 |
HIP 30318 |
16.32 |
| 2026-08-16 00:00 |
06:21:33.59 |
+12:31:48.1 |
HIP 30318 |
15.52 |
| 2026-08-16 12:00 |
06:21:36.98 |
+12:31:36.9 |
HIP 30318 |
14.74 |
| 2026-08-17 00:00 |
06:21:40.34 |
+12:31:25.6 |
HIP 30318 |
13.97 |
| 2026-08-17 12:00 |
06:21:43.67 |
+12:31:14.3 |
HIP 30318 |
13.22 |
| 2026-08-18 00:00 |
06:21:46.96 |
+12:31:03.0 |
HIP 30318 |
12.48 |
| 2026-08-18 12:00 |
06:21:50.23 |
+12:30:51.6 |
HIP 30318 |
11.76 |
| 2026-08-19 00:00 |
06:21:53.47 |
+12:30:40.1 |
HIP 30318 |
11.07 |