| Parameter |
Value |
| Designation |
C/2013 V2 (Borisov) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2014-10-14T08:23:13.560000Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:42Z |
| Obs used |
1794 |
| NEO |
- |
| M1 |
6.600 |
| K1 |
12.000 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2014-08-22.0000000 |
| e |
1.00446231 |
| q (au) |
3.507923 |
| a (au) |
-786.122697 |
| i (deg) |
37.848377 |
| Ω (om, deg) |
48.435656 |
| ω (w, deg) |
94.462543 |
| M (ma, deg) |
-0.002386 |
Magnitude
Scatter + Global Linear
$$
M_a = (9.199 + 2.863\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
9.199 |
| n |
2.863 |
| gf |
1.000 |
| gb |
-0.867 |
| 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
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-20 00:00 |
18:04:11.50 |
-52:15:58.3 |
HIP 88358 |
23.02 |
| 2026-09-20 12:00 |
18:04:11.84 |
-52:15:28.9 |
HIP 88358 |
23.44 |
| 2026-09-21 00:00 |
18:04:12.24 |
-52:14:59.5 |
HIP 88358 |
23.86 |
| 2026-09-21 12:00 |
18:04:12.70 |
-52:14:30.2 |
HIP 88358 |
24.30 |
| 2026-09-22 00:00 |
18:04:13.23 |
-52:14:00.8 |
HIP 88358 |
24.74 |
| 2026-09-22 12:00 |
18:04:13.81 |
-52:13:31.4 |
HIP 88358 |
25.18 |
| 2026-09-23 00:00 |
18:04:14.46 |
-52:13:02.0 |
HIP 88358 |
25.64 |
| 2026-09-23 12:00 |
18:04:15.17 |
-52:12:32.7 |
HIP 88358 |
26.10 |
| 2026-09-24 00:00 |
18:04:15.94 |
-52:12:03.3 |
HIP 88358 |
26.57 |
| 2026-09-24 12:00 |
18:04:16.77 |
-52:11:34.0 |
HIP 88358 |
27.04 |
| 2026-09-25 00:00 |
18:04:17.66 |
-52:11:04.7 |
HIP 88358 |
27.52 |
| 2026-09-25 12:00 |
18:04:18.62 |
-52:10:35.4 |
HIP 88358 |
28.01 |
| 2026-09-26 00:00 |
18:04:19.63 |
-52:10:06.2 |
HIP 88358 |
28.50 |
| 2026-09-26 12:00 |
18:04:20.71 |
-52:09:36.9 |
HIP 88358 |
29.00 |
| 2026-09-27 00:00 |
18:04:21.85 |
-52:09:07.7 |
HIP 88358 |
29.50 |
| 2026-09-27 12:00 |
18:04:23.05 |
-52:08:38.5 |
HIP 88675 |
29.05 |
| 2026-09-28 00:00 |
18:04:24.31 |
-52:08:09.4 |
HIP 88675 |
28.54 |
| 2026-09-28 12:00 |
18:04:25.63 |
-52:07:40.3 |
HIP 88675 |
28.03 |
| 2026-09-29 00:00 |
18:04:27.01 |
-52:07:11.2 |
HIP 88675 |
27.51 |
| 2026-09-29 12:00 |
18:04:28.45 |
-52:06:42.1 |
HIP 88675 |
26.99 |
| 2026-09-30 00:00 |
18:04:29.95 |
-52:06:13.1 |
HIP 88675 |
26.46 |
| 2026-09-30 12:00 |
18:04:31.51 |
-52:05:44.2 |
HIP 88675 |
25.93 |
| 2026-10-01 00:00 |
18:04:33.13 |
-52:05:15.3 |
HIP 88675 |
25.39 |
| 2026-10-01 12:00 |
18:04:34.82 |
-52:04:46.4 |
HIP 88675 |
24.85 |
| 2026-10-02 00:00 |
18:04:36.56 |
-52:04:17.6 |
HIP 88675 |
24.30 |
| 2026-10-02 12:00 |
18:04:38.36 |
-52:03:48.8 |
HIP 88675 |
23.75 |
| 2026-10-03 00:00 |
18:04:40.22 |
-52:03:20.1 |
HIP 88675 |
23.20 |
| 2026-10-03 12:00 |
18:04:42.14 |
-52:02:51.4 |
HIP 88675 |
22.64 |
| 2026-10-04 00:00 |
18:04:44.13 |
-52:02:22.8 |
HIP 88675 |
22.07 |
| 2026-10-04 12:00 |
18:04:46.17 |
-52:01:54.2 |
HIP 88675 |
21.50 |
| 2026-10-05 00:00 |
18:04:48.27 |
-52:01:25.7 |
HIP 88675 |
20.93 |
| 2026-10-05 12:00 |
18:04:50.43 |
-52:00:57.3 |
HIP 88675 |
20.35 |
| 2026-10-06 00:00 |
18:04:52.64 |
-52:00:28.9 |
HIP 88675 |
19.77 |
| 2026-10-06 12:00 |
18:04:54.92 |
-52:00:00.6 |
HIP 88675 |
19.18 |
| 2026-10-07 00:00 |
18:04:57.26 |
-51:59:32.4 |
HIP 88675 |
18.59 |
| 2026-10-07 12:00 |
18:04:59.65 |
-51:59:04.2 |
HIP 88675 |
17.99 |
| 2026-10-08 00:00 |
18:05:02.10 |
-51:58:36.1 |
HIP 88675 |
17.39 |
| 2026-10-08 12:00 |
18:05:04.61 |
-51:58:08.1 |
HIP 88675 |
16.79 |
| 2026-10-09 00:00 |
18:05:07.18 |
-51:57:40.1 |
HIP 88675 |
16.18 |
| 2026-10-09 12:00 |
18:05:09.81 |
-51:57:12.3 |
HIP 88675 |
15.56 |
| 2026-10-10 00:00 |
18:05:12.50 |
-51:56:44.5 |
HIP 88675 |
14.94 |
| 2026-10-10 12:00 |
18:05:15.24 |
-51:56:16.8 |
HIP 88675 |
14.32 |
| 2026-10-11 00:00 |
18:05:18.04 |
-51:55:49.2 |
HIP 88675 |
13.70 |