C/2013 V4 (Catalina)
| Parameter |
Value |
| Designation |
C/2013 V4 (Catalina) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2015-10-07T13:40:00.877440Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:42Z |
| Obs used |
2445 |
| NEO |
- |
| M1 |
6.000 |
| K1 |
9.250 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2015-08-24.0000000 |
| e |
1.00261035 |
| q (au) |
5.185419 |
| a (au) |
-1986.485935 |
| i (deg) |
67.854449 |
| Ω (om, deg) |
55.620501 |
| ω (w, deg) |
40.445881 |
| M (ma, deg) |
-0.000496 |
Magnitude
Scatter + Global Linear
$$
M_a = (7.025 + 2.739\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
7.025 |
| n |
2.739 |
| gf |
0.857 |
| gb |
-0.970 |
| k |
1.000 |
| δ90 |
6.665 |
| 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 |
15:32:49.81 |
-03:13:01.5 |
HIP 76183 |
13.32 |
| 2026-02-03 12:00 |
15:32:50.92 |
-03:12:54.8 |
HIP 76183 |
13.11 |
| 2026-02-04 00:00 |
15:32:51.99 |
-03:12:47.9 |
HIP 76183 |
12.92 |
| 2026-02-04 12:00 |
15:32:53.02 |
-03:12:40.8 |
HIP 76183 |
12.74 |
| 2026-02-05 00:00 |
15:32:54.00 |
-03:12:33.5 |
HIP 76183 |
12.57 |
| 2026-02-05 12:00 |
15:32:54.94 |
-03:12:26.0 |
HIP 76183 |
12.42 |
| 2026-02-06 00:00 |
15:32:55.84 |
-03:12:18.3 |
HIP 76183 |
12.29 |
| 2026-02-06 12:00 |
15:32:56.69 |
-03:12:10.5 |
HIP 76183 |
12.17 |
| 2026-02-07 00:00 |
15:32:57.50 |
-03:12:02.4 |
HIP 76183 |
12.06 |
| 2026-02-07 12:00 |
15:32:58.26 |
-03:11:54.1 |
HIP 76183 |
11.97 |
| 2026-02-08 00:00 |
15:32:58.98 |
-03:11:45.7 |
HIP 76183 |
11.90 |
| 2026-02-08 12:00 |
15:32:59.66 |
-03:11:37.1 |
HIP 76183 |
11.84 |
| 2026-02-09 00:00 |
15:33:00.29 |
-03:11:28.3 |
HIP 76183 |
11.79 |
| 2026-02-09 12:00 |
15:33:00.88 |
-03:11:19.3 |
HIP 76183 |
11.76 |
| 2026-02-10 00:00 |
15:33:01.42 |
-03:11:10.1 |
HIP 76183 |
11.74 |
| 2026-02-10 12:00 |
15:33:01.92 |
-03:11:00.8 |
HIP 76183 |
11.74 |
| 2026-02-11 00:00 |
15:33:02.37 |
-03:10:51.2 |
HIP 76183 |
11.75 |
| 2026-02-11 12:00 |
15:33:02.78 |
-03:10:41.5 |
HIP 76183 |
11.77 |
| 2026-02-12 00:00 |
15:33:03.15 |
-03:10:31.7 |
HIP 76183 |
11.81 |
| 2026-02-12 12:00 |
15:33:03.47 |
-03:10:21.6 |
HIP 76183 |
11.86 |
| 2026-02-13 00:00 |
15:33:03.74 |
-03:10:11.4 |
HIP 76183 |
11.93 |
| 2026-02-13 12:00 |
15:33:03.97 |
-03:10:01.0 |
HIP 76183 |
12.00 |
| 2026-02-14 00:00 |
15:33:04.16 |
-03:09:50.4 |
HIP 76183 |
12.09 |
| 2026-02-14 12:00 |
15:33:04.30 |
-03:09:39.7 |
HIP 76183 |
12.19 |
| 2026-02-15 00:00 |
15:33:04.39 |
-03:09:28.8 |
HIP 76183 |
12.30 |
| 2026-02-15 12:00 |
15:33:04.44 |
-03:09:17.7 |
HIP 76183 |
12.43 |
| 2026-02-16 00:00 |
15:33:04.45 |
-03:09:06.5 |
HIP 76183 |
12.56 |
| 2026-02-16 12:00 |
15:33:04.41 |
-03:08:55.1 |
HIP 76183 |
12.71 |
| 2026-02-17 00:00 |
15:33:04.32 |
-03:08:43.5 |
HIP 76183 |
12.87 |
| 2026-02-17 12:00 |
15:33:04.19 |
-03:08:31.8 |
HIP 76183 |
13.03 |
| 2026-02-18 00:00 |
15:33:04.02 |
-03:08:20.0 |
HIP 76183 |
13.21 |
| 2026-02-18 12:00 |
15:33:03.79 |
-03:08:07.9 |
HIP 76183 |
13.40 |
| 2026-02-19 00:00 |
15:33:03.53 |
-03:07:55.8 |
HIP 76183 |
13.59 |
| 2026-02-19 12:00 |
15:33:03.22 |
-03:07:43.5 |
HIP 76183 |
13.80 |
| 2026-02-20 00:00 |
15:33:02.86 |
-03:07:31.0 |
HIP 76183 |
14.02 |
| 2026-02-20 12:00 |
15:33:02.46 |
-03:07:18.4 |
HIP 76183 |
14.24 |
| 2026-02-21 00:00 |
15:33:02.01 |
-03:07:05.6 |
HIP 76183 |
14.48 |
| 2026-02-21 12:00 |
15:33:01.52 |
-03:06:52.7 |
HIP 76183 |
14.72 |
| 2026-02-22 00:00 |
15:33:00.98 |
-03:06:39.7 |
HIP 76183 |
14.98 |
| 2026-02-22 12:00 |
15:33:00.40 |
-03:06:26.5 |
HIP 76183 |
15.24 |
| 2026-02-23 00:00 |
15:32:59.77 |
-03:06:13.2 |
HIP 76183 |
15.51 |
| 2026-02-23 12:00 |
15:32:59.10 |
-03:05:59.7 |
HIP 76183 |
15.79 |
| 2026-02-24 00:00 |
15:32:58.38 |
-03:05:46.1 |
HIP 76183 |
16.08 |