| Parameter |
Value |
| Designation |
C/2016 R3 (Borisov) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2016-10-10T23:59:06.622080Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:26Z |
| Obs used |
60 |
| NEO |
- |
| M1 |
16.700 |
| K1 |
4.500 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2016-09-15.0000000 |
| e |
0.99548615 |
| q (au) |
0.446783 |
| a (au) |
98.980564 |
| i (deg) |
53.067840 |
| Ω (om, deg) |
78.669399 |
| ω (w, deg) |
118.135919 |
| M (ma, deg) |
359.973978 |
Magnitude
Scatter + Global Linear
$$
M_a = (17.476 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
17.476 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
0.800 |
| 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 |
02:24:00.52 |
-42:54:10.9 |
HIP 11034 |
21.31 |
| 2026-09-20 12:00 |
02:23:55.86 |
-42:54:57.8 |
HIP 11034 |
20.32 |
| 2026-09-21 00:00 |
02:23:51.17 |
-42:55:44.4 |
HIP 11034 |
19.35 |
| 2026-09-21 12:00 |
02:23:46.44 |
-42:56:30.6 |
HIP 11034 |
18.39 |
| 2026-09-22 00:00 |
02:23:41.67 |
-42:57:16.4 |
HIP 11034 |
17.44 |
| 2026-09-22 12:00 |
02:23:36.87 |
-42:58:02.0 |
HIP 11034 |
16.52 |
| 2026-09-23 00:00 |
02:23:32.03 |
-42:58:47.1 |
HIP 11034 |
15.63 |
| 2026-09-23 12:00 |
02:23:27.16 |
-42:59:31.9 |
HIP 11034 |
14.76 |
| 2026-09-24 00:00 |
02:23:22.25 |
-43:00:16.4 |
HIP 11034 |
13.94 |
| 2026-09-24 12:00 |
02:23:17.31 |
-43:01:00.4 |
HIP 11034 |
13.15 |
| 2026-09-25 00:00 |
02:23:12.34 |
-43:01:44.1 |
HIP 11034 |
12.42 |
| 2026-09-25 12:00 |
02:23:07.33 |
-43:02:27.5 |
HIP 11034 |
11.75 |
| 2026-09-26 00:00 |
02:23:02.29 |
-43:03:10.4 |
HIP 11034 |
11.16 |
| 2026-09-26 12:00 |
02:22:57.21 |
-43:03:53.0 |
HIP 11034 |
10.65 |
| 2026-09-27 00:00 |
02:22:52.11 |
-43:04:35.1 |
HIP 11034 |
10.25 |
| 2026-09-27 12:00 |
02:22:46.97 |
-43:05:16.9 |
HIP 11043 |
9.30 |
| 2026-09-28 00:00 |
02:22:41.80 |
-43:05:58.3 |
HIP 11043 |
8.15 |
| 2026-09-28 12:00 |
02:22:36.60 |
-43:06:39.3 |
HIP 11043 |
7.01 |
| 2026-09-29 00:00 |
02:22:31.37 |
-43:07:19.9 |
HIP 11043 |
5.88 |
| 2026-09-29 12:00 |
02:22:26.11 |
-43:08:00.1 |
HIP 11043 |
4.78 |
| 2026-09-30 00:00 |
02:22:20.82 |
-43:08:39.9 |
HIP 11043 |
3.72 |
| 2026-09-30 12:00 |
02:22:15.51 |
-43:09:19.3 |
HIP 11043 |
2.76 |
| 2026-10-01 00:00 |
02:22:10.16 |
-43:09:58.3 |
HIP 11043 |
2.04 |
| 2026-10-01 12:00 |
02:22:04.78 |
-43:10:36.8 |
HIP 11043 |
1.87 |
| 2026-10-02 00:00 |
02:21:59.37 |
-43:11:14.9 |
HIP 11043 |
2.37 |
| 2026-10-02 12:00 |
02:21:53.94 |
-43:11:52.6 |
HIP 11043 |
3.24 |
| 2026-10-03 00:00 |
02:21:48.48 |
-43:12:29.9 |
HIP 11043 |
4.26 |
| 2026-10-03 12:00 |
02:21:42.99 |
-43:13:06.7 |
HIP 11043 |
5.35 |
| 2026-10-04 00:00 |
02:21:37.48 |
-43:13:43.1 |
HIP 11043 |
6.47 |
| 2026-10-04 12:00 |
02:21:31.94 |
-43:14:19.1 |
HIP 11043 |
7.61 |
| 2026-10-05 00:00 |
02:21:26.38 |
-43:14:54.6 |
HIP 11043 |
8.76 |
| 2026-10-05 12:00 |
02:21:20.79 |
-43:15:29.7 |
HIP 11043 |
9.91 |
| 2026-10-06 00:00 |
02:21:15.17 |
-43:16:04.3 |
HIP 11043 |
11.07 |
| 2026-10-06 12:00 |
02:21:09.53 |
-43:16:38.5 |
HIP 11043 |
12.24 |
| 2026-10-07 00:00 |
02:21:03.87 |
-43:17:12.2 |
HIP 11043 |
13.41 |
| 2026-10-07 12:00 |
02:20:58.18 |
-43:17:45.4 |
HIP 11043 |
14.58 |
| 2026-10-08 00:00 |
02:20:52.47 |
-43:18:18.2 |
HIP 11043 |
15.75 |
| 2026-10-08 12:00 |
02:20:46.74 |
-43:18:50.5 |
HIP 11043 |
16.92 |
| 2026-10-09 00:00 |
02:20:40.99 |
-43:19:22.3 |
HIP 11043 |
18.09 |
| 2026-10-09 12:00 |
02:20:35.22 |
-43:19:53.7 |
HIP 11043 |
19.26 |
| 2026-10-10 00:00 |
02:20:29.42 |
-43:20:24.6 |
HIP 11043 |
20.43 |
| 2026-10-10 12:00 |
02:20:23.61 |
-43:20:55.0 |
HIP 11043 |
21.60 |
| 2026-10-11 00:00 |
02:20:17.77 |
-43:21:24.9 |
HIP 11043 |
22.78 |