| Parameter |
Value |
| Designation |
C/2021 L3 (Borisov) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2022-02-13T15:37:30.763200Z |
| Orbit solution date (soln_date, UTC) |
2024-04-20T20:42:18Z |
| Obs used |
215 |
| NEO |
- |
| M1 |
9.500 |
| K1 |
6.000 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2021-06-08T21:44:52.224000Z |
| Discovery magnitude (MPC) |
20.20 R |
| Discovery observatory (MPC) |
L51 · MARGO, Nauchnyi |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2022-03-04.0000000 |
| e |
1.00141430 |
| q (au) |
8.457762 |
| a (au) |
-5980.195992 |
| i (deg) |
78.580039 |
| Ω (om, deg) |
344.969335 |
| ω (w, deg) |
91.593885 |
| M (ma, deg) |
0.000039 |
Magnitude
Scatter + Global Linear
$$
M_a = (9.235 + 2.109\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
9.235 |
| n |
2.109 |
| gf |
0.990 |
| gb |
-0.789 |
| 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) |
| 2026-05-12 00:00 |
11:04:56.30 |
+28:49:22.0 |
HIP 54208 |
11.66 |
| 2026-05-12 12:00 |
11:04:51.49 |
+28:48:01.3 |
HIP 54208 |
13.37 |
| 2026-05-13 00:00 |
11:04:46.76 |
+28:46:40.2 |
HIP 54132 |
14.53 |
| 2026-05-13 12:00 |
11:04:42.13 |
+28:45:18.5 |
HIP 54132 |
12.96 |
| 2026-05-14 00:00 |
11:04:37.58 |
+28:43:56.4 |
HIP 54132 |
11.43 |
| 2026-05-14 12:00 |
11:04:33.13 |
+28:42:33.8 |
HIP 54132 |
9.95 |
| 2026-05-15 00:00 |
11:04:28.76 |
+28:41:10.8 |
HIP 54132 |
8.53 |
| 2026-05-15 12:00 |
11:04:24.49 |
+28:39:47.3 |
HIP 54132 |
7.21 |
| 2026-05-16 00:00 |
11:04:20.30 |
+28:38:23.3 |
HIP 54132 |
6.07 |
| 2026-05-16 12:00 |
11:04:16.21 |
+28:36:58.8 |
HIP 54132 |
5.20 |
| 2026-05-17 00:00 |
11:04:12.21 |
+28:35:33.9 |
HIP 54132 |
4.76 |
| 2026-05-17 12:00 |
11:04:08.30 |
+28:34:08.6 |
HIP 54132 |
4.86 |
| 2026-05-18 00:00 |
11:04:04.48 |
+28:32:42.8 |
HIP 54132 |
5.46 |
| 2026-05-18 12:00 |
11:04:00.75 |
+28:31:16.6 |
HIP 54132 |
6.43 |
| 2026-05-19 00:00 |
11:03:57.11 |
+28:29:49.9 |
HIP 54132 |
7.62 |
| 2026-05-19 12:00 |
11:03:53.56 |
+28:28:22.8 |
HIP 54132 |
8.95 |
| 2026-05-20 00:00 |
11:03:50.10 |
+28:26:55.3 |
HIP 54132 |
10.36 |
| 2026-05-20 12:00 |
11:03:46.73 |
+28:25:27.4 |
HIP 54132 |
11.81 |
| 2026-05-21 00:00 |
11:03:43.45 |
+28:23:59.1 |
HIP 54132 |
13.30 |
| 2026-05-21 12:00 |
11:03:40.26 |
+28:22:30.3 |
HIP 54132 |
14.81 |
| 2026-05-22 00:00 |
11:03:37.16 |
+28:21:01.2 |
HIP 54132 |
16.34 |
| 2026-05-22 12:00 |
11:03:34.15 |
+28:19:31.6 |
HIP 54132 |
17.88 |
| 2026-05-23 00:00 |
11:03:31.24 |
+28:18:01.7 |
HIP 54132 |
19.42 |
| 2026-05-23 12:00 |
11:03:28.41 |
+28:16:31.4 |
HIP 54132 |
20.97 |
| 2026-05-24 00:00 |
11:03:25.66 |
+28:15:00.7 |
HIP 54132 |
22.53 |
| 2026-05-24 12:00 |
11:03:23.01 |
+28:13:29.6 |
HIP 54132 |
24.08 |
| 2026-05-25 00:00 |
11:03:20.45 |
+28:11:58.1 |
HIP 53932 |
25.20 |
| 2026-05-25 12:00 |
11:03:17.98 |
+28:10:26.3 |
HIP 53932 |
23.68 |
| 2026-05-26 00:00 |
11:03:15.59 |
+28:08:54.1 |
HIP 53932 |
22.18 |
| 2026-05-26 12:00 |
11:03:13.29 |
+28:07:21.6 |
HIP 53932 |
20.70 |
| 2026-05-27 00:00 |
11:03:11.08 |
+28:05:48.7 |
HIP 53932 |
19.26 |
| 2026-05-27 12:00 |
11:03:08.96 |
+28:04:15.4 |
HIP 53932 |
17.86 |
| 2026-05-28 00:00 |
11:03:06.93 |
+28:02:41.8 |
HIP 53932 |
16.51 |
| 2026-05-28 12:00 |
11:03:04.98 |
+28:01:07.9 |
HIP 53932 |
15.23 |
| 2026-05-29 00:00 |
11:03:03.12 |
+27:59:33.6 |
HIP 53932 |
14.03 |
| 2026-05-29 12:00 |
11:03:01.35 |
+27:57:59.0 |
HIP 53932 |
12.94 |
| 2026-05-30 00:00 |
11:02:59.66 |
+27:56:24.1 |
HIP 53932 |
11.99 |
| 2026-05-30 12:00 |
11:02:58.07 |
+27:54:48.8 |
HIP 53932 |
11.21 |
| 2026-05-31 00:00 |
11:02:56.55 |
+27:53:13.2 |
HIP 53932 |
10.65 |
| 2026-05-31 12:00 |
11:02:55.13 |
+27:51:37.3 |
HIP 53932 |
10.33 |
| 2026-06-01 00:00 |
11:02:53.79 |
+27:50:01.1 |
HIP 53932 |
10.28 |
| 2026-06-01 12:00 |
11:02:52.53 |
+27:48:24.6 |
HIP 53932 |
10.51 |
| 2026-06-02 00:00 |
11:02:51.36 |
+27:46:47.8 |
HIP 53932 |
11.00 |