C/2013 J6 (Catalina)
| 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) |
| 2026-02-03 00:00 |
04:46:49.02 |
-64:12:57.7 |
HIP 22364 |
16.93 |
| 2026-02-03 12:00 |
04:46:44.03 |
-64:11:54.4 |
HIP 22364 |
18.01 |
| 2026-02-04 00:00 |
04:46:39.12 |
-64:10:50.9 |
HIP 22364 |
19.10 |
| 2026-02-04 12:00 |
04:46:34.29 |
-64:09:47.2 |
HIP 22364 |
20.20 |
| 2026-02-05 00:00 |
04:46:29.55 |
-64:08:43.1 |
HIP 22364 |
21.30 |
| 2026-02-05 12:00 |
04:46:24.90 |
-64:07:38.8 |
HIP 22364 |
22.41 |
| 2026-02-06 00:00 |
04:46:20.33 |
-64:06:34.2 |
HIP 22071 |
22.10 |
| 2026-02-06 12:00 |
04:46:15.85 |
-64:05:29.4 |
HIP 22071 |
20.91 |
| 2026-02-07 00:00 |
04:46:11.45 |
-64:04:24.3 |
HIP 22071 |
19.73 |
| 2026-02-07 12:00 |
04:46:07.13 |
-64:03:19.0 |
HIP 22071 |
18.54 |
| 2026-02-08 00:00 |
04:46:02.91 |
-64:02:13.4 |
HIP 22071 |
17.36 |
| 2026-02-08 12:00 |
04:45:58.77 |
-64:01:07.6 |
HIP 22071 |
16.18 |
| 2026-02-09 00:00 |
04:45:54.71 |
-64:00:01.6 |
HIP 22071 |
15.00 |
| 2026-02-09 12:00 |
04:45:50.75 |
-63:58:55.3 |
HIP 22071 |
13.82 |
| 2026-02-10 00:00 |
04:45:46.86 |
-63:57:48.8 |
HIP 22071 |
12.64 |
| 2026-02-10 12:00 |
04:45:43.07 |
-63:56:42.1 |
HIP 22071 |
11.47 |
| 2026-02-11 00:00 |
04:45:39.36 |
-63:55:35.2 |
HIP 22071 |
10.30 |
| 2026-02-11 12:00 |
04:45:35.74 |
-63:54:28.1 |
HIP 22071 |
9.14 |
| 2026-02-12 00:00 |
04:45:32.21 |
-63:53:20.8 |
HIP 22071 |
7.99 |
| 2026-02-12 12:00 |
04:45:28.76 |
-63:52:13.3 |
HIP 22071 |
6.86 |
| 2026-02-13 00:00 |
04:45:25.41 |
-63:51:05.6 |
HIP 22071 |
5.75 |
| 2026-02-13 12:00 |
04:45:22.13 |
-63:49:57.7 |
HIP 22071 |
4.69 |
| 2026-02-14 00:00 |
04:45:18.95 |
-63:48:49.6 |
HIP 22071 |
3.71 |
| 2026-02-14 12:00 |
04:45:15.86 |
-63:47:41.4 |
HIP 22071 |
2.89 |
| 2026-02-15 00:00 |
04:45:12.85 |
-63:46:33.0 |
HIP 22071 |
2.42 |
| 2026-02-15 12:00 |
04:45:09.93 |
-63:45:24.4 |
HIP 22071 |
2.49 |
| 2026-02-16 00:00 |
04:45:07.09 |
-63:44:15.6 |
HIP 22071 |
3.07 |
| 2026-02-16 12:00 |
04:45:04.35 |
-63:43:06.8 |
HIP 22071 |
3.93 |
| 2026-02-17 00:00 |
04:45:01.69 |
-63:41:57.7 |
HIP 22071 |
4.94 |
| 2026-02-17 12:00 |
04:44:59.12 |
-63:40:48.6 |
HIP 22071 |
6.02 |
| 2026-02-18 00:00 |
04:44:56.64 |
-63:39:39.3 |
HIP 22071 |
7.14 |
| 2026-02-18 12:00 |
04:44:54.25 |
-63:38:29.8 |
HIP 22071 |
8.27 |
| 2026-02-19 00:00 |
04:44:51.95 |
-63:37:20.2 |
HIP 22149 |
8.35 |
| 2026-02-19 12:00 |
04:44:49.73 |
-63:36:10.6 |
HIP 22149 |
8.12 |
| 2026-02-20 00:00 |
04:44:47.60 |
-63:35:00.8 |
HIP 22149 |
8.04 |
| 2026-02-20 12:00 |
04:44:45.56 |
-63:33:50.9 |
HIP 22149 |
8.13 |
| 2026-02-21 00:00 |
04:44:43.60 |
-63:32:40.9 |
HIP 22149 |
8.38 |
| 2026-02-21 12:00 |
04:44:41.73 |
-63:31:30.8 |
HIP 22149 |
8.78 |
| 2026-02-22 00:00 |
04:44:39.95 |
-63:30:20.6 |
HIP 22149 |
9.30 |
| 2026-02-22 12:00 |
04:44:38.26 |
-63:29:10.3 |
HIP 22149 |
9.93 |
| 2026-02-23 00:00 |
04:44:36.66 |
-63:28:00.0 |
HIP 22077 |
9.66 |
| 2026-02-23 12:00 |
04:44:35.14 |
-63:26:49.5 |
HIP 22077 |
8.57 |
| 2026-02-24 00:00 |
04:44:33.71 |
-63:25:39.0 |
HIP 22077 |
7.49 |