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) |
| 2026-09-20 00:00 |
06:24:08.61 |
+12:16:59.2 |
HIP 30318 |
28.34 |
| 2026-09-20 12:00 |
06:24:09.47 |
+12:16:45.7 |
HIP 30318 |
28.65 |
| 2026-09-21 00:00 |
06:24:10.30 |
+12:16:32.2 |
HIP 30318 |
28.95 |
| 2026-09-21 12:00 |
06:24:11.08 |
+12:16:18.7 |
HIP 30318 |
29.24 |
| 2026-09-22 00:00 |
06:24:11.82 |
+12:16:05.3 |
HIP 30318 |
29.52 |
| 2026-09-22 12:00 |
06:24:12.52 |
+12:15:51.8 |
HIP 30318 |
29.79 |
| 2026-09-23 00:00 |
06:24:13.18 |
+12:15:38.3 |
HIP 30318 |
30.06 |
| 2026-09-23 12:00 |
06:24:13.80 |
+12:15:24.8 |
HIP 30318 |
30.31 |
| 2026-09-24 00:00 |
06:24:14.38 |
+12:15:11.4 |
HIP 30318 |
30.56 |
| 2026-09-24 12:00 |
06:24:14.92 |
+12:14:57.9 |
HIP 30318 |
30.81 |
| 2026-09-25 00:00 |
06:24:15.41 |
+12:14:44.5 |
HIP 30318 |
31.04 |
| 2026-09-25 12:00 |
06:24:15.86 |
+12:14:31.1 |
HIP 30318 |
31.27 |
| 2026-09-26 00:00 |
06:24:16.27 |
+12:14:17.6 |
HIP 30318 |
31.49 |
| 2026-09-26 12:00 |
06:24:16.64 |
+12:14:04.2 |
HIP 30318 |
31.70 |
| 2026-09-27 00:00 |
06:24:16.97 |
+12:13:50.9 |
HIP 30318 |
31.90 |
| 2026-09-27 12:00 |
06:24:17.26 |
+12:13:37.5 |
HIP 30318 |
32.10 |
| 2026-09-28 00:00 |
06:24:17.50 |
+12:13:24.1 |
HIP 30318 |
32.29 |
| 2026-09-28 12:00 |
06:24:17.70 |
+12:13:10.8 |
HIP 30318 |
32.47 |
| 2026-09-29 00:00 |
06:24:17.86 |
+12:12:57.4 |
HIP 30282 |
32.56 |
| 2026-09-29 12:00 |
06:24:17.98 |
+12:12:44.1 |
HIP 30282 |
32.51 |
| 2026-09-30 00:00 |
06:24:18.05 |
+12:12:30.8 |
HIP 30282 |
32.46 |
| 2026-09-30 12:00 |
06:24:18.09 |
+12:12:17.6 |
HIP 30282 |
32.40 |
| 2026-10-01 00:00 |
06:24:18.08 |
+12:12:04.3 |
HIP 30282 |
32.33 |
| 2026-10-01 12:00 |
06:24:18.03 |
+12:11:51.1 |
HIP 30282 |
32.25 |
| 2026-10-02 00:00 |
06:24:17.94 |
+12:11:37.9 |
HIP 30282 |
32.17 |
| 2026-10-02 12:00 |
06:24:17.80 |
+12:11:24.7 |
HIP 30282 |
32.07 |
| 2026-10-03 00:00 |
06:24:17.62 |
+12:11:11.6 |
HIP 30282 |
31.97 |
| 2026-10-03 12:00 |
06:24:17.40 |
+12:10:58.4 |
HIP 30282 |
31.86 |
| 2026-10-04 00:00 |
06:24:17.14 |
+12:10:45.3 |
HIP 30282 |
31.74 |
| 2026-10-04 12:00 |
06:24:16.84 |
+12:10:32.3 |
HIP 30282 |
31.61 |
| 2026-10-05 00:00 |
06:24:16.49 |
+12:10:19.2 |
HIP 30282 |
31.47 |
| 2026-10-05 12:00 |
06:24:16.10 |
+12:10:06.2 |
HIP 30282 |
31.33 |
| 2026-10-06 00:00 |
06:24:15.67 |
+12:09:53.2 |
HIP 30282 |
31.17 |
| 2026-10-06 12:00 |
06:24:15.19 |
+12:09:40.3 |
HIP 30282 |
31.01 |
| 2026-10-07 00:00 |
06:24:14.67 |
+12:09:27.4 |
HIP 30282 |
30.83 |
| 2026-10-07 12:00 |
06:24:14.11 |
+12:09:14.5 |
HIP 30282 |
30.65 |
| 2026-10-08 00:00 |
06:24:13.51 |
+12:09:01.7 |
HIP 30282 |
30.46 |
| 2026-10-08 12:00 |
06:24:12.86 |
+12:08:48.9 |
HIP 30282 |
30.26 |
| 2026-10-09 00:00 |
06:24:12.17 |
+12:08:36.1 |
HIP 30282 |
30.05 |
| 2026-10-09 12:00 |
06:24:11.44 |
+12:08:23.4 |
HIP 30282 |
29.83 |
| 2026-10-10 00:00 |
06:24:10.67 |
+12:08:10.7 |
HIP 30282 |
29.60 |
| 2026-10-10 12:00 |
06:24:09.85 |
+12:07:58.0 |
HIP 30282 |
29.37 |
| 2026-10-11 00:00 |
06:24:08.99 |
+12:07:45.4 |
HIP 30282 |
29.12 |