| 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) |
| 2026-06-01 00:00 |
09:24:03.44 |
+61:28:50.9 |
HIP 46099 |
17.54 |
| 2026-06-01 12:00 |
09:24:05.72 |
+61:28:01.3 |
HIP 46099 |
18.37 |
| 2026-06-02 00:00 |
09:24:08.06 |
+61:27:11.8 |
HIP 46099 |
19.20 |
| 2026-06-02 12:00 |
09:24:10.46 |
+61:26:22.4 |
HIP 46099 |
20.03 |
| 2026-06-03 00:00 |
09:24:12.92 |
+61:25:33.0 |
HIP 46099 |
20.87 |
| 2026-06-03 12:00 |
09:24:15.44 |
+61:24:43.7 |
HIP 46099 |
21.71 |
| 2026-06-04 00:00 |
09:24:18.02 |
+61:23:54.5 |
HIP 46099 |
22.55 |
| 2026-06-04 12:00 |
09:24:20.65 |
+61:23:05.3 |
HIP 46099 |
23.39 |
| 2026-06-05 00:00 |
09:24:23.34 |
+61:22:16.2 |
HIP 46099 |
24.23 |
| 2026-06-05 12:00 |
09:24:26.09 |
+61:21:27.2 |
HIP 46099 |
25.08 |
| 2026-06-06 00:00 |
09:24:28.89 |
+61:20:38.3 |
HIP 46099 |
25.93 |
| 2026-06-06 12:00 |
09:24:31.75 |
+61:19:49.4 |
HIP 46099 |
26.78 |
| 2026-06-07 00:00 |
09:24:34.67 |
+61:19:00.6 |
HIP 45840 |
27.49 |
| 2026-06-07 12:00 |
09:24:37.64 |
+61:18:12.0 |
HIP 45840 |
27.92 |
| 2026-06-08 00:00 |
09:24:40.67 |
+61:17:23.4 |
HIP 45840 |
28.38 |
| 2026-06-08 12:00 |
09:24:43.75 |
+61:16:34.8 |
HIP 45840 |
28.86 |
| 2026-06-09 00:00 |
09:24:46.89 |
+61:15:46.4 |
HIP 45840 |
29.38 |
| 2026-06-09 12:00 |
09:24:50.08 |
+61:14:58.1 |
HIP 45840 |
29.91 |
| 2026-06-10 00:00 |
09:24:53.33 |
+61:14:09.9 |
HIP 45840 |
30.47 |
| 2026-06-10 12:00 |
09:24:56.63 |
+61:13:21.8 |
HIP 45840 |
31.05 |
| 2026-06-11 00:00 |
09:24:59.99 |
+61:12:33.8 |
HIP 45840 |
31.65 |
| 2026-06-11 12:00 |
09:25:03.39 |
+61:11:45.9 |
HIP 45840 |
32.27 |
| 2026-06-12 00:00 |
09:25:06.86 |
+61:10:58.1 |
HIP 45840 |
32.91 |
| 2026-06-12 12:00 |
09:25:10.37 |
+61:10:10.4 |
HIP 45840 |
33.56 |
| 2026-06-13 00:00 |
09:25:13.93 |
+61:09:22.8 |
HIP 45840 |
34.23 |
| 2026-06-13 12:00 |
09:25:17.55 |
+61:08:35.3 |
HIP 45840 |
34.92 |
| 2026-06-14 00:00 |
09:25:21.22 |
+61:07:48.0 |
HIP 45840 |
35.63 |
| 2026-06-14 12:00 |
09:25:24.94 |
+61:07:00.8 |
HIP 45840 |
36.34 |
| 2026-06-15 00:00 |
09:25:28.71 |
+61:06:13.7 |
HIP 45840 |
37.07 |
| 2026-06-15 12:00 |
09:25:32.53 |
+61:05:26.8 |
HIP 45840 |
37.82 |
| 2026-06-16 00:00 |
09:25:36.40 |
+61:04:40.0 |
HIP 45840 |
38.57 |
| 2026-06-16 12:00 |
09:25:40.32 |
+61:03:53.3 |
HIP 46108 |
38.61 |
| 2026-06-17 00:00 |
09:25:44.29 |
+61:03:06.7 |
HIP 46108 |
38.00 |
| 2026-06-17 12:00 |
09:25:48.30 |
+61:02:20.3 |
HIP 46108 |
37.42 |
| 2026-06-18 00:00 |
09:25:52.37 |
+61:01:34.1 |
HIP 46108 |
36.85 |
| 2026-06-18 12:00 |
09:25:56.48 |
+61:00:47.9 |
HIP 46108 |
36.30 |
| 2026-06-19 00:00 |
09:26:00.64 |
+61:00:02.0 |
HIP 46108 |
35.77 |
| 2026-06-19 12:00 |
09:26:04.85 |
+60:59:16.1 |
HIP 46108 |
35.27 |
| 2026-06-20 00:00 |
09:26:09.10 |
+60:58:30.5 |
HIP 46108 |
34.78 |
| 2026-06-20 12:00 |
09:26:13.40 |
+60:57:45.0 |
HIP 46108 |
34.32 |
| 2026-06-21 00:00 |
09:26:17.74 |
+60:56:59.6 |
HIP 46108 |
33.88 |
| 2026-06-21 12:00 |
09:26:22.13 |
+60:56:14.4 |
HIP 46108 |
33.46 |
| 2026-06-22 00:00 |
09:26:26.56 |
+60:55:29.4 |
HIP 46108 |
33.07 |