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) |
| 2026-03-26 00:00 |
21:20:00.58 |
-20:44:40.8 |
HIP 105410 |
15.32 |
| 2026-03-26 12:00 |
21:20:03.87 |
-20:44:31.1 |
HIP 105410 |
14.64 |
| 2026-03-27 00:00 |
21:20:07.12 |
-20:44:21.5 |
HIP 105410 |
13.98 |
| 2026-03-27 12:00 |
21:20:10.35 |
-20:44:12.0 |
HIP 105410 |
13.34 |
| 2026-03-28 00:00 |
21:20:13.55 |
-20:44:02.8 |
HIP 105410 |
12.71 |
| 2026-03-28 12:00 |
21:20:16.73 |
-20:43:53.6 |
HIP 105410 |
12.10 |
| 2026-03-29 00:00 |
21:20:19.87 |
-20:43:44.7 |
HIP 105410 |
11.52 |
| 2026-03-29 12:00 |
21:20:22.99 |
-20:43:35.8 |
HIP 105410 |
10.96 |
| 2026-03-30 00:00 |
21:20:26.08 |
-20:43:27.2 |
HIP 105410 |
10.43 |
| 2026-03-30 12:00 |
21:20:29.13 |
-20:43:18.7 |
HIP 105410 |
9.93 |
| 2026-03-31 00:00 |
21:20:32.16 |
-20:43:10.4 |
HIP 105410 |
9.46 |
| 2026-03-31 12:00 |
21:20:35.17 |
-20:43:02.2 |
HIP 105410 |
9.03 |
| 2026-04-01 00:00 |
21:20:38.14 |
-20:42:54.2 |
HIP 105410 |
8.64 |
| 2026-04-01 12:00 |
21:20:41.08 |
-20:42:46.3 |
HIP 105410 |
8.29 |
| 2026-04-02 00:00 |
21:20:43.99 |
-20:42:38.6 |
HIP 105410 |
7.99 |
| 2026-04-02 12:00 |
21:20:46.87 |
-20:42:31.1 |
HIP 105410 |
7.74 |
| 2026-04-03 00:00 |
21:20:49.73 |
-20:42:23.7 |
HIP 105410 |
7.55 |
| 2026-04-03 12:00 |
21:20:52.55 |
-20:42:16.5 |
HIP 105410 |
7.41 |
| 2026-04-04 00:00 |
21:20:55.34 |
-20:42:09.4 |
HIP 105410 |
7.34 |
| 2026-04-04 12:00 |
21:20:58.10 |
-20:42:02.6 |
HIP 105410 |
7.32 |
| 2026-04-05 00:00 |
21:21:00.84 |
-20:41:55.8 |
HIP 105410 |
7.35 |
| 2026-04-05 12:00 |
21:21:03.54 |
-20:41:49.3 |
HIP 105410 |
7.44 |
| 2026-04-06 00:00 |
21:21:06.20 |
-20:41:42.9 |
HIP 105410 |
7.58 |
| 2026-04-06 12:00 |
21:21:08.84 |
-20:41:36.7 |
HIP 105410 |
7.77 |
| 2026-04-07 00:00 |
21:21:11.45 |
-20:41:30.6 |
HIP 105410 |
7.99 |
| 2026-04-07 12:00 |
21:21:14.02 |
-20:41:24.7 |
HIP 105410 |
8.25 |
| 2026-04-08 00:00 |
21:21:16.57 |
-20:41:19.0 |
HIP 105410 |
8.54 |
| 2026-04-08 12:00 |
21:21:19.08 |
-20:41:13.5 |
HIP 105410 |
8.86 |
| 2026-04-09 00:00 |
21:21:21.56 |
-20:41:08.1 |
HIP 105410 |
9.20 |
| 2026-04-09 12:00 |
21:21:24.01 |
-20:41:02.9 |
HIP 105410 |
9.55 |
| 2026-04-10 00:00 |
21:21:26.42 |
-20:40:57.8 |
HIP 105410 |
9.92 |
| 2026-04-10 12:00 |
21:21:28.80 |
-20:40:53.0 |
HIP 105410 |
10.31 |
| 2026-04-11 00:00 |
21:21:31.15 |
-20:40:48.3 |
HIP 105410 |
10.70 |
| 2026-04-11 12:00 |
21:21:33.47 |
-20:40:43.7 |
HIP 105410 |
11.10 |
| 2026-04-12 00:00 |
21:21:35.75 |
-20:40:39.4 |
HIP 105410 |
11.50 |
| 2026-04-12 12:00 |
21:21:38.00 |
-20:40:35.2 |
HIP 105410 |
11.90 |
| 2026-04-13 00:00 |
21:21:40.22 |
-20:40:31.2 |
HIP 105410 |
12.31 |
| 2026-04-13 12:00 |
21:21:42.41 |
-20:40:27.3 |
HIP 105410 |
12.72 |
| 2026-04-14 00:00 |
21:21:44.56 |
-20:40:23.7 |
HIP 105410 |
13.13 |
| 2026-04-14 12:00 |
21:21:46.67 |
-20:40:20.2 |
HIP 105410 |
13.54 |
| 2026-04-15 00:00 |
21:21:48.75 |
-20:40:16.9 |
HIP 105410 |
13.94 |
| 2026-04-15 12:00 |
21:21:50.80 |
-20:40:13.7 |
HIP 105410 |
14.35 |
| 2026-04-16 00:00 |
21:21:52.82 |
-20:40:10.7 |
HIP 105410 |
14.74 |