| 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
$$
M_a = (3.589 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
3.589 |
| n |
6.000 |
| gf |
0.905 |
| gb |
-0.799 |
| k |
0.807 |
| δ90 |
8.563 |
| 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 |
11:33:11.22 |
-52:35:43.7 |
HIP 56357 |
14.76 |
| 2026-05-12 12:00 |
11:33:06.93 |
-52:34:57.3 |
HIP 56357 |
13.98 |
| 2026-05-13 00:00 |
11:33:02.68 |
-52:34:10.8 |
HIP 56357 |
13.24 |
| 2026-05-13 12:00 |
11:32:58.49 |
-52:33:24.1 |
HIP 56357 |
12.54 |
| 2026-05-14 00:00 |
11:32:54.35 |
-52:32:37.4 |
HIP 56357 |
11.87 |
| 2026-05-14 12:00 |
11:32:50.26 |
-52:31:50.5 |
HIP 56357 |
11.25 |
| 2026-05-15 00:00 |
11:32:46.22 |
-52:31:03.6 |
HIP 56357 |
10.68 |
| 2026-05-15 12:00 |
11:32:42.23 |
-52:30:16.5 |
HIP 56357 |
10.17 |
| 2026-05-16 00:00 |
11:32:38.29 |
-52:29:29.3 |
HIP 56357 |
9.74 |
| 2026-05-16 12:00 |
11:32:34.41 |
-52:28:42.1 |
HIP 56357 |
9.38 |
| 2026-05-17 00:00 |
11:32:30.57 |
-52:27:54.8 |
HIP 56357 |
9.11 |
| 2026-05-17 12:00 |
11:32:26.79 |
-52:27:07.3 |
HIP 56357 |
8.93 |
| 2026-05-18 00:00 |
11:32:23.06 |
-52:26:19.8 |
HIP 56357 |
8.85 |
| 2026-05-18 12:00 |
11:32:19.39 |
-52:25:32.2 |
HIP 56357 |
8.87 |
| 2026-05-19 00:00 |
11:32:15.76 |
-52:24:44.6 |
HIP 56357 |
8.99 |
| 2026-05-19 12:00 |
11:32:12.19 |
-52:23:56.9 |
HIP 56357 |
9.20 |
| 2026-05-20 00:00 |
11:32:08.67 |
-52:23:09.1 |
HIP 56357 |
9.50 |
| 2026-05-20 12:00 |
11:32:05.21 |
-52:22:21.3 |
HIP 56357 |
9.87 |
| 2026-05-21 00:00 |
11:32:01.80 |
-52:21:33.4 |
HIP 56357 |
10.32 |
| 2026-05-21 12:00 |
11:31:58.44 |
-52:20:45.5 |
HIP 56357 |
10.82 |
| 2026-05-22 00:00 |
11:31:55.13 |
-52:19:57.5 |
HIP 56357 |
11.37 |
| 2026-05-22 12:00 |
11:31:51.88 |
-52:19:09.5 |
HIP 56357 |
11.96 |
| 2026-05-23 00:00 |
11:31:48.68 |
-52:18:21.5 |
HIP 56357 |
12.59 |
| 2026-05-23 12:00 |
11:31:45.53 |
-52:17:33.5 |
HIP 56317 |
12.87 |
| 2026-05-24 00:00 |
11:31:42.44 |
-52:16:45.4 |
HIP 56317 |
12.70 |
| 2026-05-24 12:00 |
11:31:39.40 |
-52:15:57.3 |
HIP 56317 |
12.59 |
| 2026-05-25 00:00 |
11:31:36.42 |
-52:15:09.2 |
HIP 56317 |
12.54 |
| 2026-05-25 12:00 |
11:31:33.48 |
-52:14:21.0 |
HIP 56317 |
12.55 |
| 2026-05-26 00:00 |
11:31:30.61 |
-52:13:32.9 |
HIP 56317 |
12.62 |
| 2026-05-26 12:00 |
11:31:27.78 |
-52:12:44.8 |
HIP 56317 |
12.75 |
| 2026-05-27 00:00 |
11:31:25.01 |
-52:11:56.6 |
HIP 56317 |
12.94 |
| 2026-05-27 12:00 |
11:31:22.29 |
-52:11:08.5 |
HIP 56317 |
13.17 |
| 2026-05-28 00:00 |
11:31:19.63 |
-52:10:20.4 |
HIP 56317 |
13.46 |
| 2026-05-28 12:00 |
11:31:17.02 |
-52:09:32.3 |
HIP 56317 |
13.79 |
| 2026-05-29 00:00 |
11:31:14.46 |
-52:08:44.2 |
HIP 56317 |
14.16 |
| 2026-05-29 12:00 |
11:31:11.96 |
-52:07:56.1 |
HIP 56317 |
14.57 |
| 2026-05-30 00:00 |
11:31:09.51 |
-52:07:08.0 |
HIP 56317 |
15.01 |
| 2026-05-30 12:00 |
11:31:07.11 |
-52:06:20.0 |
HIP 56317 |
15.48 |
| 2026-05-31 00:00 |
11:31:04.77 |
-52:05:32.0 |
HIP 56317 |
15.98 |
| 2026-05-31 12:00 |
11:31:02.48 |
-52:04:44.1 |
HIP 56317 |
16.50 |
| 2026-06-01 00:00 |
11:31:00.25 |
-52:03:56.2 |
HIP 56317 |
17.05 |
| 2026-06-01 12:00 |
11:30:58.07 |
-52:03:08.3 |
HIP 56317 |
17.61 |
| 2026-06-02 00:00 |
11:30:55.94 |
-52:02:20.5 |
HIP 56317 |
18.19 |