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) |
| 2026-09-20 00:00 |
21:09:26.98 |
-21:51:07.4 |
HIP 104367 |
15.43 |
| 2026-09-20 12:00 |
21:09:23.96 |
-21:51:16.5 |
HIP 104367 |
15.01 |
| 2026-09-21 00:00 |
21:09:20.97 |
-21:51:25.3 |
HIP 104367 |
14.62 |
| 2026-09-21 12:00 |
21:09:18.00 |
-21:51:34.1 |
HIP 104367 |
14.25 |
| 2026-09-22 00:00 |
21:09:15.07 |
-21:51:42.7 |
HIP 104367 |
13.92 |
| 2026-09-22 12:00 |
21:09:12.16 |
-21:51:51.1 |
HIP 104367 |
13.61 |
| 2026-09-23 00:00 |
21:09:09.28 |
-21:51:59.3 |
HIP 104367 |
13.33 |
| 2026-09-23 12:00 |
21:09:06.43 |
-21:52:07.4 |
HIP 104367 |
13.08 |
| 2026-09-24 00:00 |
21:09:03.61 |
-21:52:15.3 |
HIP 104367 |
12.87 |
| 2026-09-24 12:00 |
21:09:00.83 |
-21:52:23.1 |
HIP 104367 |
12.69 |
| 2026-09-25 00:00 |
21:08:58.07 |
-21:52:30.7 |
HIP 104367 |
12.53 |
| 2026-09-25 12:00 |
21:08:55.34 |
-21:52:38.1 |
HIP 104367 |
12.42 |
| 2026-09-26 00:00 |
21:08:52.64 |
-21:52:45.4 |
HIP 104367 |
12.33 |
| 2026-09-26 12:00 |
21:08:49.97 |
-21:52:52.5 |
HIP 104367 |
12.27 |
| 2026-09-27 00:00 |
21:08:47.33 |
-21:52:59.4 |
HIP 104367 |
12.25 |
| 2026-09-27 12:00 |
21:08:44.72 |
-21:53:06.2 |
HIP 104367 |
12.26 |
| 2026-09-28 00:00 |
21:08:42.14 |
-21:53:12.8 |
HIP 104367 |
12.29 |
| 2026-09-28 12:00 |
21:08:39.60 |
-21:53:19.2 |
HIP 104367 |
12.36 |
| 2026-09-29 00:00 |
21:08:37.08 |
-21:53:25.5 |
HIP 104367 |
12.44 |
| 2026-09-29 12:00 |
21:08:34.60 |
-21:53:31.6 |
HIP 104367 |
12.56 |
| 2026-09-30 00:00 |
21:08:32.15 |
-21:53:37.5 |
HIP 104367 |
12.69 |
| 2026-09-30 12:00 |
21:08:29.73 |
-21:53:43.3 |
HIP 104367 |
12.85 |
| 2026-10-01 00:00 |
21:08:27.34 |
-21:53:48.9 |
HIP 104367 |
13.02 |
| 2026-10-01 12:00 |
21:08:24.99 |
-21:53:54.3 |
HIP 104367 |
13.22 |
| 2026-10-02 00:00 |
21:08:22.67 |
-21:53:59.6 |
HIP 104367 |
13.43 |
| 2026-10-02 12:00 |
21:08:20.38 |
-21:54:04.7 |
HIP 104367 |
13.65 |
| 2026-10-03 00:00 |
21:08:18.12 |
-21:54:09.6 |
HIP 104367 |
13.88 |
| 2026-10-03 12:00 |
21:08:15.90 |
-21:54:14.4 |
HIP 104367 |
14.13 |
| 2026-10-04 00:00 |
21:08:13.71 |
-21:54:19.0 |
HIP 104367 |
14.38 |
| 2026-10-04 12:00 |
21:08:11.56 |
-21:54:23.4 |
HIP 104367 |
14.64 |
| 2026-10-05 00:00 |
21:08:09.43 |
-21:54:27.6 |
HIP 104367 |
14.91 |
| 2026-10-05 12:00 |
21:08:07.35 |
-21:54:31.7 |
HIP 104367 |
15.18 |
| 2026-10-06 00:00 |
21:08:05.29 |
-21:54:35.6 |
HIP 104367 |
15.46 |
| 2026-10-06 12:00 |
21:08:03.27 |
-21:54:39.3 |
HIP 104367 |
15.75 |
| 2026-10-07 00:00 |
21:08:01.29 |
-21:54:42.9 |
HIP 104367 |
16.03 |
| 2026-10-07 12:00 |
21:07:59.34 |
-21:54:46.3 |
HIP 104367 |
16.31 |
| 2026-10-08 00:00 |
21:07:57.42 |
-21:54:49.5 |
HIP 104367 |
16.60 |
| 2026-10-08 12:00 |
21:07:55.54 |
-21:54:52.5 |
HIP 104367 |
16.89 |
| 2026-10-09 00:00 |
21:07:53.70 |
-21:54:55.4 |
HIP 104367 |
17.17 |
| 2026-10-09 12:00 |
21:07:51.89 |
-21:54:58.1 |
HIP 104367 |
17.46 |
| 2026-10-10 00:00 |
21:07:50.12 |
-21:55:00.6 |
HIP 104367 |
17.74 |
| 2026-10-10 12:00 |
21:07:48.38 |
-21:55:02.9 |
HIP 104367 |
18.02 |
| 2026-10-11 00:00 |
21:07:46.68 |
-21:55:05.1 |
HIP 104367 |
18.30 |