メタデータ
| 項目 |
値 |
| Designation |
C/2014 R1 (Borisov) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2014-11-19T05:45:38.039040Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:59Z |
| Obs used |
523 |
| NEO |
- |
| M1 |
9.700 |
| K1 |
13.250 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2015-01-09.0000000 |
| e |
0.99249938 |
| q (au) |
1.345431 |
| a (au) |
179.376061 |
| i (deg) |
9.932908 |
| Ω (om, deg) |
104.051786 |
| ω (w, deg) |
55.649107 |
| M (ma, deg) |
0.020825 |
等級
散乱 + 全体線形
$$
M_a = (9.468 + 5.229\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
9.468 |
| n |
5.229 |
| gf |
1.000 |
| gb |
-0.935 |
| 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
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) |
終了日 (UTC) |
a |
b |
| 2014-09-05 |
2014-11-18 |
+15.2936 |
-3.191 |
| 2014-11-19 |
2015-08-06 |
+3.9121 |
-1.721 |
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) |
| 2026-06-01 00:00 |
21:22:21.40 |
-20:48:04.9 |
HIP 105410 |
18.33 |
| 2026-06-01 12:00 |
21:22:19.98 |
-20:48:17.7 |
HIP 105410 |
17.98 |
| 2026-06-02 00:00 |
21:22:18.53 |
-20:48:30.6 |
HIP 105410 |
17.63 |
| 2026-06-02 12:00 |
21:22:17.04 |
-20:48:43.6 |
HIP 105410 |
17.28 |
| 2026-06-03 00:00 |
21:22:15.52 |
-20:48:56.8 |
HIP 105410 |
16.92 |
| 2026-06-03 12:00 |
21:22:13.96 |
-20:49:10.1 |
HIP 105410 |
16.55 |
| 2026-06-04 00:00 |
21:22:12.37 |
-20:49:23.6 |
HIP 105410 |
16.18 |
| 2026-06-04 12:00 |
21:22:10.74 |
-20:49:37.2 |
HIP 105410 |
15.80 |
| 2026-06-05 00:00 |
21:22:09.08 |
-20:49:50.9 |
HIP 105410 |
15.42 |
| 2026-06-05 12:00 |
21:22:07.38 |
-20:50:04.8 |
HIP 105410 |
15.03 |
| 2026-06-06 00:00 |
21:22:05.65 |
-20:50:18.8 |
HIP 105410 |
14.64 |
| 2026-06-06 12:00 |
21:22:03.88 |
-20:50:32.9 |
HIP 105410 |
14.25 |
| 2026-06-07 00:00 |
21:22:02.07 |
-20:50:47.2 |
HIP 105410 |
13.85 |
| 2026-06-07 12:00 |
21:22:00.24 |
-20:51:01.6 |
HIP 105410 |
13.46 |
| 2026-06-08 00:00 |
21:21:58.37 |
-20:51:16.1 |
HIP 105410 |
13.06 |
| 2026-06-08 12:00 |
21:21:56.46 |
-20:51:30.8 |
HIP 105410 |
12.66 |
| 2026-06-09 00:00 |
21:21:54.52 |
-20:51:45.6 |
HIP 105410 |
12.26 |
| 2026-06-09 12:00 |
21:21:52.55 |
-20:52:00.5 |
HIP 105410 |
11.87 |
| 2026-06-10 00:00 |
21:21:50.54 |
-20:52:15.5 |
HIP 105410 |
11.47 |
| 2026-06-10 12:00 |
21:21:48.50 |
-20:52:30.7 |
HIP 105410 |
11.08 |
| 2026-06-11 00:00 |
21:21:46.42 |
-20:52:46.0 |
HIP 105410 |
10.70 |
| 2026-06-11 12:00 |
21:21:44.31 |
-20:53:01.4 |
HIP 105410 |
10.33 |
| 2026-06-12 00:00 |
21:21:42.17 |
-20:53:16.9 |
HIP 105410 |
9.97 |
| 2026-06-12 12:00 |
21:21:39.99 |
-20:53:32.6 |
HIP 105410 |
9.62 |
| 2026-06-13 00:00 |
21:21:37.78 |
-20:53:48.4 |
HIP 105410 |
9.28 |
| 2026-06-13 12:00 |
21:21:35.54 |
-20:54:04.3 |
HIP 105410 |
8.97 |
| 2026-06-14 00:00 |
21:21:33.27 |
-20:54:20.3 |
HIP 105410 |
8.68 |
| 2026-06-14 12:00 |
21:21:30.96 |
-20:54:36.4 |
HIP 105410 |
8.41 |
| 2026-06-15 00:00 |
21:21:28.62 |
-20:54:52.7 |
HIP 105410 |
8.18 |
| 2026-06-15 12:00 |
21:21:26.25 |
-20:55:09.0 |
HIP 105410 |
7.99 |
| 2026-06-16 00:00 |
21:21:23.85 |
-20:55:25.5 |
HIP 105410 |
7.83 |
| 2026-06-16 12:00 |
21:21:21.41 |
-20:55:42.1 |
HIP 105410 |
7.72 |
| 2026-06-17 00:00 |
21:21:18.95 |
-20:55:58.7 |
HIP 105410 |
7.66 |
| 2026-06-17 12:00 |
21:21:16.45 |
-20:56:15.5 |
HIP 105410 |
7.66 |
| 2026-06-18 00:00 |
21:21:13.92 |
-20:56:32.4 |
HIP 105410 |
7.70 |
| 2026-06-18 12:00 |
21:21:11.36 |
-20:56:49.4 |
HIP 105410 |
7.80 |
| 2026-06-19 00:00 |
21:21:08.77 |
-20:57:06.5 |
HIP 105410 |
7.96 |
| 2026-06-19 12:00 |
21:21:06.15 |
-20:57:23.7 |
HIP 105410 |
8.16 |
| 2026-06-20 00:00 |
21:21:03.50 |
-20:57:41.0 |
HIP 105410 |
8.42 |
| 2026-06-20 12:00 |
21:21:00.82 |
-20:57:58.4 |
HIP 105410 |
8.73 |
| 2026-06-21 00:00 |
21:20:58.11 |
-20:58:15.9 |
HIP 105410 |
9.08 |
| 2026-06-21 12:00 |
21:20:55.37 |
-20:58:33.5 |
HIP 105410 |
9.47 |
| 2026-06-22 00:00 |
21:20:52.60 |
-20:58:51.2 |
HIP 105410 |
9.90 |