C/2013 G5 (Catalina)
| Parameter |
Value |
| Designation |
C/2013 G5 (Catalina) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2013-09-01T12:06:25.499520Z |
| Orbit solution date (soln_date, UTC) |
2022-06-07T21:44:04Z |
| Obs used |
114 |
| NEO |
- |
| M1 |
14.300 |
| K1 |
11.250 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2013-04-23.0000000 |
| e |
0.99971461 |
| q (au) |
0.928919 |
| a (au) |
3254.937233 |
| i (deg) |
40.613476 |
| Ω (om, deg) |
144.282160 |
| ω (w, deg) |
165.667285 |
| M (ma, deg) |
359.999302 |
Magnitude
Scatter + Global Linear
$$
M_a = (15.455 + 2.768\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
15.455 |
| n |
2.768 |
| gf |
0.800 |
| gb |
-0.500 |
| k |
1.000 |
| δ90 |
1.000 |
| 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 |
07:34:46.38 |
-01:08:51.5 |
HIP 36821 |
12.24 |
| 2026-02-03 12:00 |
07:34:42.69 |
-01:08:32.3 |
HIP 36821 |
12.04 |
| 2026-02-04 00:00 |
07:34:39.01 |
-01:08:13.0 |
HIP 36821 |
11.92 |
| 2026-02-04 12:00 |
07:34:35.35 |
-01:07:53.5 |
HIP 36821 |
11.88 |
| 2026-02-05 00:00 |
07:34:31.70 |
-01:07:33.9 |
HIP 36821 |
11.93 |
| 2026-02-05 12:00 |
07:34:28.07 |
-01:07:14.1 |
HIP 36821 |
12.05 |
| 2026-02-06 00:00 |
07:34:24.46 |
-01:06:54.2 |
HIP 36821 |
12.26 |
| 2026-02-06 12:00 |
07:34:20.86 |
-01:06:34.1 |
HIP 36821 |
12.54 |
| 2026-02-07 00:00 |
07:34:17.28 |
-01:06:13.8 |
HIP 36821 |
12.88 |
| 2026-02-07 12:00 |
07:34:13.71 |
-01:05:53.4 |
HIP 36821 |
13.29 |
| 2026-02-08 00:00 |
07:34:10.17 |
-01:05:32.9 |
HIP 36821 |
13.75 |
| 2026-02-08 12:00 |
07:34:06.64 |
-01:05:12.2 |
HIP 36821 |
14.27 |
| 2026-02-09 00:00 |
07:34:03.13 |
-01:04:51.3 |
HIP 36821 |
14.83 |
| 2026-02-09 12:00 |
07:33:59.64 |
-01:04:30.4 |
HIP 36821 |
15.42 |
| 2026-02-10 00:00 |
07:33:56.16 |
-01:04:09.2 |
HIP 36821 |
16.05 |
| 2026-02-10 12:00 |
07:33:52.71 |
-01:03:48.0 |
HIP 36821 |
16.71 |
| 2026-02-11 00:00 |
07:33:49.27 |
-01:03:26.6 |
HIP 36821 |
17.39 |
| 2026-02-11 12:00 |
07:33:45.85 |
-01:03:05.0 |
HIP 36821 |
18.10 |
| 2026-02-12 00:00 |
07:33:42.46 |
-01:02:43.3 |
HIP 36821 |
18.82 |
| 2026-02-12 12:00 |
07:33:39.08 |
-01:02:21.5 |
HIP 36821 |
19.56 |
| 2026-02-13 00:00 |
07:33:35.73 |
-01:01:59.6 |
HIP 36821 |
20.32 |
| 2026-02-13 12:00 |
07:33:32.39 |
-01:01:37.5 |
HIP 36821 |
21.08 |
| 2026-02-14 00:00 |
07:33:29.08 |
-01:01:15.3 |
HIP 36821 |
21.86 |
| 2026-02-14 12:00 |
07:33:25.78 |
-01:00:53.0 |
HIP 36821 |
22.64 |
| 2026-02-15 00:00 |
07:33:22.51 |
-01:00:30.6 |
HIP 36821 |
23.43 |
| 2026-02-15 12:00 |
07:33:19.26 |
-01:00:08.0 |
HIP 36821 |
24.23 |
| 2026-02-16 00:00 |
07:33:16.03 |
-00:59:45.3 |
HIP 36821 |
25.03 |
| 2026-02-16 12:00 |
07:33:12.83 |
-00:59:22.5 |
HIP 36821 |
25.83 |
| 2026-02-17 00:00 |
07:33:09.65 |
-00:58:59.6 |
HIP 36821 |
26.64 |
| 2026-02-17 12:00 |
07:33:06.49 |
-00:58:36.6 |
HIP 36821 |
27.45 |
| 2026-02-18 00:00 |
07:33:03.35 |
-00:58:13.4 |
HIP 36565 |
28.09 |
| 2026-02-18 12:00 |
07:33:00.24 |
-00:57:50.2 |
HIP 36565 |
27.49 |
| 2026-02-19 00:00 |
07:32:57.15 |
-00:57:26.8 |
HIP 36565 |
26.91 |
| 2026-02-19 12:00 |
07:32:54.09 |
-00:57:03.3 |
HIP 36565 |
26.36 |
| 2026-02-20 00:00 |
07:32:51.05 |
-00:56:39.8 |
HIP 36565 |
25.83 |
| 2026-02-20 12:00 |
07:32:48.03 |
-00:56:16.1 |
HIP 36565 |
25.32 |
| 2026-02-21 00:00 |
07:32:45.04 |
-00:55:52.3 |
HIP 36565 |
24.83 |
| 2026-02-21 12:00 |
07:32:42.07 |
-00:55:28.4 |
HIP 36565 |
24.38 |
| 2026-02-22 00:00 |
07:32:39.13 |
-00:55:04.5 |
HIP 36565 |
23.95 |
| 2026-02-22 12:00 |
07:32:36.22 |
-00:54:40.4 |
HIP 36565 |
23.55 |
| 2026-02-23 00:00 |
07:32:33.33 |
-00:54:16.3 |
HIP 36565 |
23.17 |
| 2026-02-23 12:00 |
07:32:30.46 |
-00:53:52.1 |
HIP 36659 |
22.79 |
| 2026-02-24 00:00 |
07:32:27.63 |
-00:53:27.7 |
HIP 36659 |
22.36 |