C/2014 R1 (Borisov)
| Parameter |
Value |
| 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 |
Osculating Elements
| Parameter |
Value |
| 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 |
Magnitude
Scatter + Global Linear
$$
M_a = (9.468 + 5.229\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
9.468 |
| n |
5.229 |
| gf |
1.000 |
| gb |
-0.935 |
| k |
1.000 |
| δ90 |
10.000 |
| Parameter |
Symbol |
Range |
Description |
| Absolute magnitude at 1 AU from Sun and Earth |
H0 |
-5 to 20 |
Intrinsic brightness of the comet |
| Photometric slope parameter |
n |
2 to 6 |
Rate of brightness change with heliocentric distance |
| Forward scattering asymmetry factor |
gf |
0.8 to 1 |
Degree of forward scattering |
| Backward scattering asymmetry factor |
gb |
-1 to -0.5 |
Degree of backward scattering |
| Partitioning coefficient |
k |
0.8 to 1 |
Ratio between forward/backward scattering contributions |
| Dust-to-gas brightness ratio |
δ90 |
1 to 10 |
Relative contribution of dust scattering to gas emission |
Reference: EPSC-DPS2025-160
Residuals (Piecewise)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| Start (UTC) |
End (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(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
21:12:45.07 |
-21:11:51.6 |
HIP 104708 |
11.31 |
| 2026-02-03 12:00 |
21:12:49.84 |
-21:11:31.4 |
HIP 104708 |
11.23 |
| 2026-02-04 00:00 |
21:12:54.61 |
-21:11:11.3 |
HIP 104708 |
11.27 |
| 2026-02-04 12:00 |
21:12:59.38 |
-21:10:51.2 |
HIP 104708 |
11.43 |
| 2026-02-05 00:00 |
21:13:04.14 |
-21:10:31.1 |
HIP 104708 |
11.70 |
| 2026-02-05 12:00 |
21:13:08.91 |
-21:10:11.2 |
HIP 104708 |
12.08 |
| 2026-02-06 00:00 |
21:13:13.67 |
-21:09:51.2 |
HIP 104708 |
12.56 |
| 2026-02-06 12:00 |
21:13:18.44 |
-21:09:31.3 |
HIP 104708 |
13.12 |
| 2026-02-07 00:00 |
21:13:23.20 |
-21:09:11.4 |
HIP 104708 |
13.76 |
| 2026-02-07 12:00 |
21:13:27.96 |
-21:08:51.6 |
HIP 104708 |
14.46 |
| 2026-02-08 00:00 |
21:13:32.71 |
-21:08:31.9 |
HIP 104708 |
15.22 |
| 2026-02-08 12:00 |
21:13:37.47 |
-21:08:12.2 |
HIP 104708 |
16.02 |
| 2026-02-09 00:00 |
21:13:42.22 |
-21:07:52.5 |
HIP 104708 |
16.87 |
| 2026-02-09 12:00 |
21:13:46.97 |
-21:07:33.0 |
HIP 104708 |
17.75 |
| 2026-02-10 00:00 |
21:13:51.71 |
-21:07:13.4 |
HIP 104708 |
18.66 |
| 2026-02-10 12:00 |
21:13:56.45 |
-21:06:53.9 |
HIP 104708 |
19.60 |
| 2026-02-11 00:00 |
21:14:01.19 |
-21:06:34.5 |
HIP 104926 |
20.44 |
| 2026-02-11 12:00 |
21:14:05.92 |
-21:06:15.2 |
HIP 104926 |
19.71 |
| 2026-02-12 00:00 |
21:14:10.65 |
-21:05:55.9 |
HIP 104926 |
19.02 |
| 2026-02-12 12:00 |
21:14:15.37 |
-21:05:36.6 |
HIP 104926 |
18.37 |
| 2026-02-13 00:00 |
21:14:20.08 |
-21:05:17.5 |
HIP 104926 |
17.78 |
| 2026-02-13 12:00 |
21:14:24.79 |
-21:04:58.4 |
HIP 104926 |
17.25 |
| 2026-02-14 00:00 |
21:14:29.50 |
-21:04:39.3 |
HIP 104926 |
16.77 |
| 2026-02-14 12:00 |
21:14:34.19 |
-21:04:20.3 |
HIP 104926 |
16.36 |
| 2026-02-15 00:00 |
21:14:38.89 |
-21:04:01.4 |
HIP 104926 |
16.02 |
| 2026-02-15 12:00 |
21:14:43.57 |
-21:03:42.6 |
HIP 104926 |
15.76 |
| 2026-02-16 00:00 |
21:14:48.25 |
-21:03:23.9 |
HIP 104926 |
15.58 |
| 2026-02-16 12:00 |
21:14:52.91 |
-21:03:05.2 |
HIP 104926 |
15.47 |
| 2026-02-17 00:00 |
21:14:57.58 |
-21:02:46.6 |
HIP 104903 |
15.44 |
| 2026-02-17 12:00 |
21:15:02.23 |
-21:02:28.0 |
HIP 104903 |
15.17 |
| 2026-02-18 00:00 |
21:15:06.87 |
-21:02:09.6 |
HIP 104903 |
14.98 |
| 2026-02-18 12:00 |
21:15:11.51 |
-21:01:51.2 |
HIP 104903 |
14.87 |
| 2026-02-19 00:00 |
21:15:16.13 |
-21:01:32.9 |
HIP 104903 |
14.84 |
| 2026-02-19 12:00 |
21:15:20.75 |
-21:01:14.7 |
HIP 104903 |
14.91 |
| 2026-02-20 00:00 |
21:15:25.35 |
-21:00:56.6 |
HIP 104903 |
15.05 |
| 2026-02-20 12:00 |
21:15:29.95 |
-21:00:38.6 |
HIP 104903 |
15.28 |
| 2026-02-21 00:00 |
21:15:34.53 |
-21:00:20.6 |
HIP 104903 |
15.58 |
| 2026-02-21 12:00 |
21:15:39.11 |
-21:00:02.7 |
HIP 104903 |
15.96 |
| 2026-02-22 00:00 |
21:15:43.67 |
-20:59:45.0 |
HIP 104903 |
16.40 |
| 2026-02-22 12:00 |
21:15:48.22 |
-20:59:27.3 |
HIP 104903 |
16.90 |
| 2026-02-23 00:00 |
21:15:52.77 |
-20:59:09.7 |
HIP 104903 |
17.46 |
| 2026-02-23 12:00 |
21:15:57.29 |
-20:58:52.2 |
HIP 104903 |
18.06 |
| 2026-02-24 00:00 |
21:16:01.81 |
-20:58:34.8 |
HIP 104903 |
18.71 |