| Parameter |
Value |
| Designation |
C/2013 L2 (Catalina) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2012-05-11T04:41:32.150400Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:37Z |
| Obs used |
242 |
| NEO |
- |
| M1 |
12.300 |
| K1 |
4.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2013-06-27.0000000 |
| e |
1.00092750 |
| q (au) |
4.872285 |
| a (au) |
-5253.163467 |
| i (deg) |
106.776427 |
| Ω (om, deg) |
285.877705 |
| ω (w, deg) |
1.941215 |
| M (ma, deg) |
0.001066 |
Magnitude
Scatter + Global Linear
$$
M_a = (10.956 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
10.956 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.957 |
| k |
1.000 |
| δ90 |
9.999 |
| 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 |
09:44:54.84 |
+59:52:19.5 |
HIP 47894 |
13.41 |
| 2026-09-20 12:00 |
09:45:00.35 |
+59:52:28.7 |
HIP 47894 |
13.27 |
| 2026-09-21 00:00 |
09:45:05.83 |
+59:52:38.2 |
HIP 47894 |
13.17 |
| 2026-09-21 12:00 |
09:45:11.27 |
+59:52:48.2 |
HIP 47894 |
13.12 |
| 2026-09-22 00:00 |
09:45:16.68 |
+59:52:58.4 |
HIP 47894 |
13.10 |
| 2026-09-22 12:00 |
09:45:22.06 |
+59:53:09.1 |
HIP 47894 |
13.14 |
| 2026-09-23 00:00 |
09:45:27.39 |
+59:53:20.1 |
HIP 47894 |
13.22 |
| 2026-09-23 12:00 |
09:45:32.70 |
+59:53:31.5 |
HIP 47894 |
13.34 |
| 2026-09-24 00:00 |
09:45:37.97 |
+59:53:43.2 |
HIP 47894 |
13.50 |
| 2026-09-24 12:00 |
09:45:43.20 |
+59:53:55.2 |
HIP 47894 |
13.70 |
| 2026-09-25 00:00 |
09:45:48.39 |
+59:54:07.7 |
HIP 47894 |
13.93 |
| 2026-09-25 12:00 |
09:45:53.55 |
+59:54:20.5 |
HIP 47894 |
14.20 |
| 2026-09-26 00:00 |
09:45:58.67 |
+59:54:33.6 |
HIP 47894 |
14.51 |
| 2026-09-26 12:00 |
09:46:03.76 |
+59:54:47.1 |
HIP 47894 |
14.84 |
| 2026-09-27 00:00 |
09:46:08.80 |
+59:55:00.9 |
HIP 47894 |
15.20 |
| 2026-09-27 12:00 |
09:46:13.81 |
+59:55:15.1 |
HIP 47894 |
15.58 |
| 2026-09-28 00:00 |
09:46:18.78 |
+59:55:29.7 |
HIP 47894 |
15.99 |
| 2026-09-28 12:00 |
09:46:23.71 |
+59:55:44.6 |
HIP 47894 |
16.42 |
| 2026-09-29 00:00 |
09:46:28.60 |
+59:55:59.8 |
HIP 47894 |
16.87 |
| 2026-09-29 12:00 |
09:46:33.45 |
+59:56:15.4 |
HIP 47894 |
17.34 |
| 2026-09-30 00:00 |
09:46:38.26 |
+59:56:31.4 |
HIP 47894 |
17.82 |
| 2026-09-30 12:00 |
09:46:43.03 |
+59:56:47.7 |
HIP 48140 |
18.26 |
| 2026-10-01 00:00 |
09:46:47.75 |
+59:57:04.3 |
HIP 48140 |
17.61 |
| 2026-10-01 12:00 |
09:46:52.44 |
+59:57:21.3 |
HIP 48140 |
16.96 |
| 2026-10-02 00:00 |
09:46:57.09 |
+59:57:38.6 |
HIP 48140 |
16.32 |
| 2026-10-02 12:00 |
09:47:01.69 |
+59:57:56.3 |
HIP 48140 |
15.67 |
| 2026-10-03 00:00 |
09:47:06.25 |
+59:58:14.3 |
HIP 48140 |
15.03 |
| 2026-10-03 12:00 |
09:47:10.77 |
+59:58:32.7 |
HIP 48140 |
14.38 |
| 2026-10-04 00:00 |
09:47:15.24 |
+59:58:51.4 |
HIP 48140 |
13.74 |
| 2026-10-04 12:00 |
09:47:19.67 |
+59:59:10.5 |
HIP 48140 |
13.10 |
| 2026-10-05 00:00 |
09:47:24.05 |
+59:59:29.9 |
HIP 48140 |
12.47 |
| 2026-10-05 12:00 |
09:47:28.39 |
+59:59:49.6 |
HIP 48140 |
11.83 |
| 2026-10-06 00:00 |
09:47:32.69 |
+60:00:09.7 |
HIP 48140 |
11.20 |
| 2026-10-06 12:00 |
09:47:36.94 |
+60:00:30.2 |
HIP 48140 |
10.57 |
| 2026-10-07 00:00 |
09:47:41.14 |
+60:00:50.9 |
HIP 48140 |
9.94 |
| 2026-10-07 12:00 |
09:47:45.30 |
+60:01:12.0 |
HIP 48140 |
9.32 |
| 2026-10-08 00:00 |
09:47:49.41 |
+60:01:33.5 |
HIP 48140 |
8.69 |
| 2026-10-08 12:00 |
09:47:53.47 |
+60:01:55.2 |
HIP 48140 |
8.07 |
| 2026-10-09 00:00 |
09:47:57.49 |
+60:02:17.3 |
HIP 48140 |
7.46 |
| 2026-10-09 12:00 |
09:48:01.45 |
+60:02:39.8 |
HIP 48140 |
6.84 |
| 2026-10-10 00:00 |
09:48:05.37 |
+60:03:02.6 |
HIP 48140 |
6.24 |
| 2026-10-10 12:00 |
09:48:09.24 |
+60:03:25.7 |
HIP 48140 |
5.63 |
| 2026-10-11 00:00 |
09:48:13.06 |
+60:03:49.1 |
HIP 48140 |
5.04 |