C/2014 Q3 (Borisov)
| Parameter |
Value |
| Designation |
C/2014 Q3 (Borisov) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2014-11-19T01:37:12.034560Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:59Z |
| Obs used |
766 |
| NEO |
- |
| M1 |
8.800 |
| K1 |
22.000 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2014-10-19.0000000 |
| e |
0.94206319 |
| q (au) |
1.647407 |
| a (au) |
28.434555 |
| i (deg) |
89.948878 |
| Ω (om, deg) |
63.129517 |
| ω (w, deg) |
47.380883 |
| M (ma, deg) |
359.798051 |
Magnitude
Scatter + Global Linear
$$
M_a = (13.028 + 2.018\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
13.028 |
| n |
2.018 |
| gf |
1.000 |
| gb |
-1.000 |
| 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 |
| 2014-08-22 |
2014-11-18 |
+16.4094 |
-4.762 |
| 2014-11-19 |
2015-03-24 |
+26.2508 |
-7.298 |
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 |
15:51:48.01 |
-44:29:34.4 |
HIP 77603 |
13.84 |
| 2026-02-03 12:00 |
15:51:49.80 |
-44:30:13.7 |
HIP 77603 |
13.95 |
| 2026-02-04 00:00 |
15:51:51.53 |
-44:30:52.9 |
HIP 77603 |
14.10 |
| 2026-02-04 12:00 |
15:51:53.21 |
-44:31:32.2 |
HIP 77603 |
14.26 |
| 2026-02-05 00:00 |
15:51:54.83 |
-44:32:11.3 |
HIP 77603 |
14.46 |
| 2026-02-05 12:00 |
15:51:56.40 |
-44:32:50.5 |
HIP 77603 |
14.67 |
| 2026-02-06 00:00 |
15:51:57.91 |
-44:33:29.6 |
HIP 77603 |
14.91 |
| 2026-02-06 12:00 |
15:51:59.36 |
-44:34:08.7 |
HIP 77603 |
15.16 |
| 2026-02-07 00:00 |
15:52:00.75 |
-44:34:47.7 |
HIP 77603 |
15.43 |
| 2026-02-07 12:00 |
15:52:02.09 |
-44:35:26.7 |
HIP 77603 |
15.72 |
| 2026-02-08 00:00 |
15:52:03.37 |
-44:36:05.6 |
HIP 77603 |
16.02 |
| 2026-02-08 12:00 |
15:52:04.59 |
-44:36:44.5 |
HIP 77603 |
16.33 |
| 2026-02-09 00:00 |
15:52:05.76 |
-44:37:23.3 |
HIP 77603 |
16.66 |
| 2026-02-09 12:00 |
15:52:06.86 |
-44:38:02.1 |
HIP 77603 |
16.99 |
| 2026-02-10 00:00 |
15:52:07.91 |
-44:38:40.8 |
HIP 77603 |
17.34 |
| 2026-02-10 12:00 |
15:52:08.90 |
-44:39:19.4 |
HIP 77603 |
17.69 |
| 2026-02-11 00:00 |
15:52:09.83 |
-44:39:58.0 |
HIP 77603 |
18.06 |
| 2026-02-11 12:00 |
15:52:10.70 |
-44:40:36.5 |
HIP 77603 |
18.42 |
| 2026-02-12 00:00 |
15:52:11.51 |
-44:41:15.0 |
HIP 77603 |
18.80 |
| 2026-02-12 12:00 |
15:52:12.26 |
-44:41:53.4 |
HIP 77603 |
19.18 |
| 2026-02-13 00:00 |
15:52:12.96 |
-44:42:31.7 |
HIP 77603 |
19.56 |
| 2026-02-13 12:00 |
15:52:13.59 |
-44:43:09.9 |
HIP 77603 |
19.95 |
| 2026-02-14 00:00 |
15:52:14.16 |
-44:43:48.1 |
HIP 77603 |
20.34 |
| 2026-02-14 12:00 |
15:52:14.68 |
-44:44:26.2 |
HIP 77603 |
20.73 |
| 2026-02-15 00:00 |
15:52:15.13 |
-44:45:04.1 |
HIP 77603 |
21.13 |
| 2026-02-15 12:00 |
15:52:15.53 |
-44:45:42.0 |
HIP 77603 |
21.53 |
| 2026-02-16 00:00 |
15:52:15.86 |
-44:46:19.9 |
HIP 77603 |
21.93 |
| 2026-02-16 12:00 |
15:52:16.13 |
-44:46:57.6 |
HIP 77603 |
22.33 |
| 2026-02-17 00:00 |
15:52:16.35 |
-44:47:35.2 |
HIP 77603 |
22.73 |
| 2026-02-17 12:00 |
15:52:16.50 |
-44:48:12.8 |
HIP 77603 |
23.13 |
| 2026-02-18 00:00 |
15:52:16.59 |
-44:48:50.2 |
HIP 77603 |
23.53 |
| 2026-02-18 12:00 |
15:52:16.62 |
-44:49:27.5 |
HIP 77603 |
23.94 |
| 2026-02-19 00:00 |
15:52:16.59 |
-44:50:04.8 |
HIP 77603 |
24.34 |
| 2026-02-19 12:00 |
15:52:16.50 |
-44:50:41.9 |
HIP 77603 |
24.74 |
| 2026-02-20 00:00 |
15:52:16.35 |
-44:51:18.9 |
HIP 77603 |
25.14 |
| 2026-02-20 12:00 |
15:52:16.14 |
-44:51:55.8 |
HIP 77730 |
25.14 |
| 2026-02-21 00:00 |
15:52:15.86 |
-44:52:32.6 |
HIP 77730 |
24.52 |
| 2026-02-21 12:00 |
15:52:15.53 |
-44:53:09.3 |
HIP 77730 |
23.91 |
| 2026-02-22 00:00 |
15:52:15.13 |
-44:53:45.8 |
HIP 77730 |
23.30 |
| 2026-02-22 12:00 |
15:52:14.68 |
-44:54:22.3 |
HIP 77730 |
22.69 |
| 2026-02-23 00:00 |
15:52:14.16 |
-44:54:58.6 |
HIP 77730 |
22.09 |
| 2026-02-23 12:00 |
15:52:13.58 |
-44:55:34.8 |
HIP 77730 |
21.48 |
| 2026-02-24 00:00 |
15:52:12.94 |
-44:56:10.8 |
HIP 77730 |
20.88 |