| Parameter |
Value |
| Designation |
C/2013 J6 (Catalina) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2013-04-09T13:32:09.997440Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:35Z |
| Obs used |
129 |
| NEO |
- |
| M1 |
16.500 |
| K1 |
4.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2013-05-27.0000000 |
| e |
0.95963357 |
| q (au) |
2.415721 |
| a (au) |
59.844807 |
| i (deg) |
85.054919 |
| Ω (om, deg) |
68.421264 |
| ω (w, deg) |
125.644531 |
| M (ma, deg) |
0.100989 |
Magnitude
Scatter + Global Linear
$$
M_a = (15.883 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
15.883 |
| n |
2.000 |
| gf |
0.929 |
| gb |
-0.760 |
| k |
0.991 |
| δ90 |
7.236 |
| 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) |
| 2026-03-26 00:00 |
04:45:38.17 |
-62:16:02.5 |
HIP 22083 |
14.16 |
| 2026-03-26 12:00 |
04:45:41.58 |
-62:14:56.7 |
HIP 22083 |
15.33 |
| 2026-03-27 00:00 |
04:45:45.05 |
-62:13:51.2 |
HIP 22083 |
16.49 |
| 2026-03-27 12:00 |
04:45:48.59 |
-62:12:45.8 |
HIP 22083 |
17.65 |
| 2026-03-28 00:00 |
04:45:52.21 |
-62:11:40.7 |
HIP 22083 |
18.81 |
| 2026-03-28 12:00 |
04:45:55.88 |
-62:10:35.9 |
HIP 22083 |
19.98 |
| 2026-03-29 00:00 |
04:45:59.63 |
-62:09:31.2 |
HIP 22083 |
21.14 |
| 2026-03-29 12:00 |
04:46:03.44 |
-62:08:26.8 |
HIP 22083 |
22.29 |
| 2026-03-30 00:00 |
04:46:07.32 |
-62:07:22.6 |
HIP 22083 |
23.45 |
| 2026-03-30 12:00 |
04:46:11.27 |
-62:06:18.7 |
HIP 22083 |
24.61 |
| 2026-03-31 00:00 |
04:46:15.27 |
-62:05:15.0 |
HIP 22083 |
25.77 |
| 2026-03-31 12:00 |
04:46:19.35 |
-62:04:11.6 |
HIP 22083 |
26.92 |
| 2026-04-01 00:00 |
04:46:23.49 |
-62:03:08.4 |
HIP 22083 |
28.07 |
| 2026-04-01 12:00 |
04:46:27.69 |
-62:02:05.5 |
HIP 22083 |
29.23 |
| 2026-04-02 00:00 |
04:46:31.96 |
-62:01:02.8 |
HIP 22083 |
30.38 |
| 2026-04-02 12:00 |
04:46:36.29 |
-62:00:00.4 |
HIP 22083 |
31.53 |
| 2026-04-03 00:00 |
04:46:40.68 |
-61:58:58.3 |
HIP 22249 |
30.79 |
| 2026-04-03 12:00 |
04:46:45.13 |
-61:57:56.4 |
HIP 22249 |
29.69 |
| 2026-04-04 00:00 |
04:46:49.65 |
-61:56:54.8 |
HIP 22249 |
28.60 |
| 2026-04-04 12:00 |
04:46:54.23 |
-61:55:53.5 |
HIP 22249 |
27.52 |
| 2026-04-05 00:00 |
04:46:58.87 |
-61:54:52.5 |
HIP 22249 |
26.45 |
| 2026-04-05 12:00 |
04:47:03.57 |
-61:53:51.8 |
HIP 22249 |
25.39 |
| 2026-04-06 00:00 |
04:47:08.33 |
-61:52:51.3 |
HIP 22249 |
24.34 |
| 2026-04-06 12:00 |
04:47:13.15 |
-61:51:51.1 |
HIP 22249 |
23.31 |
| 2026-04-07 00:00 |
04:47:18.03 |
-61:50:51.2 |
HIP 22249 |
22.29 |
| 2026-04-07 12:00 |
04:47:22.97 |
-61:49:51.7 |
HIP 22249 |
21.30 |
| 2026-04-08 00:00 |
04:47:27.97 |
-61:48:52.4 |
HIP 22249 |
20.32 |
| 2026-04-08 12:00 |
04:47:33.02 |
-61:47:53.4 |
HIP 22249 |
19.37 |
| 2026-04-09 00:00 |
04:47:38.13 |
-61:46:54.7 |
HIP 22249 |
18.45 |
| 2026-04-09 12:00 |
04:47:43.31 |
-61:45:56.4 |
HIP 22249 |
17.57 |
| 2026-04-10 00:00 |
04:47:48.53 |
-61:44:58.3 |
HIP 22249 |
16.72 |
| 2026-04-10 12:00 |
04:47:53.82 |
-61:44:00.6 |
HIP 22249 |
15.91 |
| 2026-04-11 00:00 |
04:47:59.16 |
-61:43:03.2 |
HIP 22249 |
15.16 |
| 2026-04-11 12:00 |
04:48:04.56 |
-61:42:06.1 |
HIP 22249 |
14.47 |
| 2026-04-12 00:00 |
04:48:10.01 |
-61:41:09.3 |
HIP 22249 |
13.84 |
| 2026-04-12 12:00 |
04:48:15.52 |
-61:40:12.9 |
HIP 22249 |
13.30 |
| 2026-04-13 00:00 |
04:48:21.08 |
-61:39:16.8 |
HIP 22249 |
12.84 |
| 2026-04-13 12:00 |
04:48:26.69 |
-61:38:21.1 |
HIP 22249 |
12.48 |
| 2026-04-14 00:00 |
04:48:32.36 |
-61:37:25.6 |
HIP 22249 |
12.23 |
| 2026-04-14 12:00 |
04:48:38.08 |
-61:36:30.6 |
HIP 22249 |
12.08 |
| 2026-04-15 00:00 |
04:48:43.86 |
-61:35:35.8 |
HIP 22249 |
12.06 |
| 2026-04-15 12:00 |
04:48:49.68 |
-61:34:41.5 |
HIP 22249 |
12.15 |
| 2026-04-16 00:00 |
04:48:55.56 |
-61:33:47.4 |
HIP 22249 |
12.35 |