| 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) |
| 2026-07-29 00:00 |
09:33:29.50 |
+60:09:44.6 |
HIP 46672 |
25.07 |
| 2026-07-29 12:00 |
09:33:36.09 |
+60:09:17.2 |
HIP 46672 |
25.42 |
| 2026-07-30 00:00 |
09:33:42.70 |
+60:08:50.1 |
HIP 46672 |
25.81 |
| 2026-07-30 12:00 |
09:33:49.32 |
+60:08:23.3 |
HIP 46672 |
26.23 |
| 2026-07-31 00:00 |
09:33:55.95 |
+60:07:56.8 |
HIP 46672 |
26.68 |
| 2026-07-31 12:00 |
09:34:02.59 |
+60:07:30.6 |
HIP 46672 |
27.16 |
| 2026-08-01 00:00 |
09:34:09.24 |
+60:07:04.7 |
HIP 47231 |
26.53 |
| 2026-08-01 12:00 |
09:34:15.90 |
+60:06:39.2 |
HIP 47231 |
25.83 |
| 2026-08-02 00:00 |
09:34:22.58 |
+60:06:13.9 |
HIP 47236 |
24.95 |
| 2026-08-02 12:00 |
09:34:29.26 |
+60:05:48.9 |
HIP 47236 |
24.06 |
| 2026-08-03 00:00 |
09:34:35.95 |
+60:05:24.2 |
HIP 47236 |
23.18 |
| 2026-08-03 12:00 |
09:34:42.65 |
+60:04:59.8 |
HIP 47236 |
22.30 |
| 2026-08-04 00:00 |
09:34:49.36 |
+60:04:35.8 |
HIP 47236 |
21.42 |
| 2026-08-04 12:00 |
09:34:56.08 |
+60:04:12.0 |
HIP 47236 |
20.54 |
| 2026-08-05 00:00 |
09:35:02.81 |
+60:03:48.6 |
HIP 47236 |
19.67 |
| 2026-08-05 12:00 |
09:35:09.54 |
+60:03:25.5 |
HIP 47236 |
18.80 |
| 2026-08-06 00:00 |
09:35:16.28 |
+60:03:02.7 |
HIP 47236 |
17.94 |
| 2026-08-06 12:00 |
09:35:23.03 |
+60:02:40.2 |
HIP 47236 |
17.08 |
| 2026-08-07 00:00 |
09:35:29.78 |
+60:02:18.0 |
HIP 47236 |
16.23 |
| 2026-08-07 12:00 |
09:35:36.53 |
+60:01:56.2 |
HIP 47236 |
15.39 |
| 2026-08-08 00:00 |
09:35:43.30 |
+60:01:34.6 |
HIP 47236 |
14.55 |
| 2026-08-08 12:00 |
09:35:50.07 |
+60:01:13.4 |
HIP 47236 |
13.72 |
| 2026-08-09 00:00 |
09:35:56.84 |
+60:00:52.6 |
HIP 47236 |
12.90 |
| 2026-08-09 12:00 |
09:36:03.61 |
+60:00:32.0 |
HIP 47236 |
12.10 |
| 2026-08-10 00:00 |
09:36:10.39 |
+60:00:11.8 |
HIP 47236 |
11.31 |
| 2026-08-10 12:00 |
09:36:17.17 |
+59:59:51.9 |
HIP 47236 |
10.54 |
| 2026-08-11 00:00 |
09:36:23.96 |
+59:59:32.3 |
HIP 47236 |
9.79 |
| 2026-08-11 12:00 |
09:36:30.74 |
+59:59:13.1 |
HIP 47236 |
9.07 |
| 2026-08-12 00:00 |
09:36:37.53 |
+59:58:54.2 |
HIP 47236 |
8.38 |
| 2026-08-12 12:00 |
09:36:44.32 |
+59:58:35.6 |
HIP 47236 |
7.73 |
| 2026-08-13 00:00 |
09:36:51.11 |
+59:58:17.4 |
HIP 47236 |
7.14 |
| 2026-08-13 12:00 |
09:36:57.89 |
+59:57:59.5 |
HIP 47236 |
6.61 |
| 2026-08-14 00:00 |
09:37:04.68 |
+59:57:41.9 |
HIP 47236 |
6.16 |
| 2026-08-14 12:00 |
09:37:11.47 |
+59:57:24.7 |
HIP 47236 |
5.81 |
| 2026-08-15 00:00 |
09:37:18.25 |
+59:57:07.8 |
HIP 47236 |
5.59 |
| 2026-08-15 12:00 |
09:37:25.04 |
+59:56:51.2 |
HIP 47236 |
5.49 |
| 2026-08-16 00:00 |
09:37:31.82 |
+59:56:35.0 |
HIP 47236 |
5.53 |
| 2026-08-16 12:00 |
09:37:38.60 |
+59:56:19.1 |
HIP 47236 |
5.71 |
| 2026-08-17 00:00 |
09:37:45.37 |
+59:56:03.6 |
HIP 47236 |
6.01 |
| 2026-08-17 12:00 |
09:37:52.14 |
+59:55:48.4 |
HIP 47236 |
6.41 |
| 2026-08-18 00:00 |
09:37:58.91 |
+59:55:33.6 |
HIP 47236 |
6.90 |
| 2026-08-18 12:00 |
09:38:05.67 |
+59:55:19.1 |
HIP 47236 |
7.45 |
| 2026-08-19 00:00 |
09:38:12.43 |
+59:55:04.9 |
HIP 47236 |
8.06 |