| Parameter |
Value |
| Designation |
C/2010 L3 (Catalina) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2010-11-10T11:09:03.124800Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:44Z |
| Obs used |
123 |
| NEO |
- |
| M1 |
4.700 |
| K1 |
10.000 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2010-12-11.0000000 |
| e |
0.99924162 |
| q (au) |
9.882907 |
| a (au) |
13031.539959 |
| i (deg) |
102.631072 |
| Ω (om, deg) |
38.275340 |
| ω (w, deg) |
121.773967 |
| M (ma, deg) |
0.000020 |
Magnitude
Scatter + Global Linear
$$
M_a = (3.629 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
3.629 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.799 |
| k |
0.801 |
| δ90 |
9.456 |
| 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 |
11:40:13.41 |
-50:53:18.3 |
HIP 57052 |
21.45 |
| 2026-09-20 12:00 |
11:40:18.41 |
-50:53:40.8 |
HIP 57052 |
21.21 |
| 2026-09-21 00:00 |
11:40:23.41 |
-50:54:03.8 |
HIP 57052 |
21.00 |
| 2026-09-21 12:00 |
11:40:28.41 |
-50:54:27.1 |
HIP 57052 |
20.84 |
| 2026-09-22 00:00 |
11:40:33.40 |
-50:54:50.9 |
HIP 57052 |
20.71 |
| 2026-09-22 12:00 |
11:40:38.39 |
-50:55:15.0 |
HIP 57052 |
20.64 |
| 2026-09-23 00:00 |
11:40:43.38 |
-50:55:39.4 |
HIP 57052 |
20.60 |
| 2026-09-23 12:00 |
11:40:48.36 |
-50:56:04.3 |
HIP 57052 |
20.61 |
| 2026-09-24 00:00 |
11:40:53.33 |
-50:56:29.5 |
HIP 57052 |
20.66 |
| 2026-09-24 12:00 |
11:40:58.31 |
-50:56:55.1 |
HIP 57052 |
20.76 |
| 2026-09-25 00:00 |
11:41:03.27 |
-50:57:21.1 |
HIP 57052 |
20.90 |
| 2026-09-25 12:00 |
11:41:08.23 |
-50:57:47.5 |
HIP 57052 |
21.09 |
| 2026-09-26 00:00 |
11:41:13.19 |
-50:58:14.2 |
HIP 57052 |
21.32 |
| 2026-09-26 12:00 |
11:41:18.14 |
-50:58:41.3 |
HIP 57052 |
21.59 |
| 2026-09-27 00:00 |
11:41:23.08 |
-50:59:08.7 |
HIP 57052 |
21.90 |
| 2026-09-27 12:00 |
11:41:28.01 |
-50:59:36.6 |
HIP 57052 |
22.24 |
| 2026-09-28 00:00 |
11:41:32.94 |
-51:00:04.8 |
HIP 57052 |
22.63 |
| 2026-09-28 12:00 |
11:41:37.86 |
-51:00:33.3 |
HIP 57052 |
23.05 |
| 2026-09-29 00:00 |
11:41:42.77 |
-51:01:02.2 |
HIP 57052 |
23.51 |
| 2026-09-29 12:00 |
11:41:47.68 |
-51:01:31.5 |
HIP 57052 |
23.99 |
| 2026-09-30 00:00 |
11:41:52.57 |
-51:02:01.2 |
HIP 57052 |
24.51 |
| 2026-09-30 12:00 |
11:41:57.46 |
-51:02:31.2 |
HIP 57052 |
25.06 |
| 2026-10-01 00:00 |
11:42:02.33 |
-51:03:01.5 |
HIP 57052 |
25.63 |
| 2026-10-01 12:00 |
11:42:07.20 |
-51:03:32.2 |
HIP 57052 |
26.23 |
| 2026-10-02 00:00 |
11:42:12.05 |
-51:04:03.3 |
HIP 57052 |
26.85 |
| 2026-10-02 12:00 |
11:42:16.90 |
-51:04:34.7 |
HIP 57052 |
27.50 |
| 2026-10-03 00:00 |
11:42:21.74 |
-51:05:06.5 |
HIP 57052 |
28.17 |
| 2026-10-03 12:00 |
11:42:26.56 |
-51:05:38.6 |
HIP 57259 |
28.19 |
| 2026-10-04 00:00 |
11:42:31.37 |
-51:06:11.1 |
HIP 57259 |
28.06 |
| 2026-10-04 12:00 |
11:42:36.17 |
-51:06:43.9 |
HIP 57254 |
27.35 |
| 2026-10-05 00:00 |
11:42:40.96 |
-51:07:17.1 |
HIP 57254 |
26.46 |
| 2026-10-05 12:00 |
11:42:45.73 |
-51:07:50.6 |
HIP 57254 |
25.56 |
| 2026-10-06 00:00 |
11:42:50.49 |
-51:08:24.5 |
HIP 57254 |
24.66 |
| 2026-10-06 12:00 |
11:42:55.24 |
-51:08:58.7 |
HIP 57254 |
23.76 |
| 2026-10-07 00:00 |
11:42:59.98 |
-51:09:33.2 |
HIP 57254 |
22.86 |
| 2026-10-07 12:00 |
11:43:04.70 |
-51:10:08.1 |
HIP 57254 |
21.97 |
| 2026-10-08 00:00 |
11:43:09.40 |
-51:10:43.3 |
HIP 57254 |
21.07 |
| 2026-10-08 12:00 |
11:43:14.09 |
-51:11:18.9 |
HIP 57254 |
20.17 |
| 2026-10-09 00:00 |
11:43:18.77 |
-51:11:54.8 |
HIP 57254 |
19.27 |
| 2026-10-09 12:00 |
11:43:23.42 |
-51:12:31.0 |
HIP 57254 |
18.38 |
| 2026-10-10 00:00 |
11:43:28.07 |
-51:13:07.6 |
HIP 57254 |
17.48 |
| 2026-10-10 12:00 |
11:43:32.69 |
-51:13:44.4 |
HIP 57254 |
16.59 |
| 2026-10-11 00:00 |
11:43:37.30 |
-51:14:21.6 |
HIP 57254 |
15.71 |