C/2013 F2 (Catalina)
| Parameter |
Value |
| Designation |
C/2013 F2 (Catalina) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2013-04-19T00:12:51.621120Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:32Z |
| Obs used |
168 |
| NEO |
- |
| M1 |
7.100 |
| K1 |
10.000 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2013-07-28.0000000 |
| e |
0.99925889 |
| q (au) |
6.217862 |
| a (au) |
8389.886246 |
| i (deg) |
61.749267 |
| Ω (om, deg) |
344.272220 |
| ω (w, deg) |
122.991132 |
| M (ma, deg) |
0.000128 |
Magnitude
Scatter + Global Linear
$$
M_a = (2.163 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
2.163 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
1.000 |
| δ90 |
10.000 |
| 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 |
11:50:09.31 |
-59:39:40.4 |
HIP 57718 |
18.46 |
| 2026-02-03 12:00 |
11:50:03.40 |
-59:40:21.5 |
HIP 57718 |
19.17 |
| 2026-02-04 00:00 |
11:49:57.44 |
-59:41:02.1 |
HIP 57718 |
19.91 |
| 2026-02-04 12:00 |
11:49:51.42 |
-59:41:42.2 |
HIP 57718 |
20.66 |
| 2026-02-05 00:00 |
11:49:45.34 |
-59:42:21.9 |
HIP 57718 |
21.43 |
| 2026-02-05 12:00 |
11:49:39.22 |
-59:43:01.1 |
HIP 57718 |
22.21 |
| 2026-02-06 00:00 |
11:49:33.03 |
-59:43:39.7 |
HIP 57718 |
23.00 |
| 2026-02-06 12:00 |
11:49:26.80 |
-59:44:17.9 |
HIP 57718 |
23.80 |
| 2026-02-07 00:00 |
11:49:20.51 |
-59:44:55.6 |
HIP 57718 |
24.61 |
| 2026-02-07 12:00 |
11:49:14.17 |
-59:45:32.8 |
HIP 57718 |
25.43 |
| 2026-02-08 00:00 |
11:49:07.77 |
-59:46:09.5 |
HIP 57718 |
26.26 |
| 2026-02-08 12:00 |
11:49:01.33 |
-59:46:45.7 |
HIP 57718 |
27.09 |
| 2026-02-09 00:00 |
11:48:54.83 |
-59:47:21.4 |
HIP 57718 |
27.93 |
| 2026-02-09 12:00 |
11:48:48.29 |
-59:47:56.6 |
HIP 57796 |
28.35 |
| 2026-02-10 00:00 |
11:48:41.69 |
-59:48:31.3 |
HIP 57796 |
28.40 |
| 2026-02-10 12:00 |
11:48:35.05 |
-59:49:05.4 |
HIP 57796 |
28.50 |
| 2026-02-11 00:00 |
11:48:28.35 |
-59:49:39.1 |
HIP 57440 |
27.91 |
| 2026-02-11 12:00 |
11:48:21.61 |
-59:50:12.2 |
HIP 57440 |
27.00 |
| 2026-02-12 00:00 |
11:48:14.82 |
-59:50:44.8 |
HIP 57440 |
26.10 |
| 2026-02-12 12:00 |
11:48:07.99 |
-59:51:16.9 |
HIP 57440 |
25.22 |
| 2026-02-13 00:00 |
11:48:01.10 |
-59:51:48.4 |
HIP 57440 |
24.35 |
| 2026-02-13 12:00 |
11:47:54.18 |
-59:52:19.5 |
HIP 57440 |
23.50 |
| 2026-02-14 00:00 |
11:47:47.20 |
-59:52:50.0 |
HIP 57440 |
22.66 |
| 2026-02-14 12:00 |
11:47:40.18 |
-59:53:19.9 |
HIP 57440 |
21.85 |
| 2026-02-15 00:00 |
11:47:33.12 |
-59:53:49.3 |
HIP 57440 |
21.06 |
| 2026-02-15 12:00 |
11:47:26.02 |
-59:54:18.2 |
HIP 57440 |
20.30 |
| 2026-02-16 00:00 |
11:47:18.87 |
-59:54:46.5 |
HIP 57440 |
19.56 |
| 2026-02-16 12:00 |
11:47:11.68 |
-59:55:14.3 |
HIP 57440 |
18.86 |
| 2026-02-17 00:00 |
11:47:04.45 |
-59:55:41.6 |
HIP 57440 |
18.20 |
| 2026-02-17 12:00 |
11:46:57.18 |
-59:56:08.3 |
HIP 57440 |
17.57 |
| 2026-02-18 00:00 |
11:46:49.87 |
-59:56:34.4 |
HIP 57440 |
16.99 |
| 2026-02-18 12:00 |
11:46:42.52 |
-59:57:00.0 |
HIP 57440 |
16.47 |
| 2026-02-19 00:00 |
11:46:35.13 |
-59:57:25.1 |
HIP 57440 |
16.00 |
| 2026-02-19 12:00 |
11:46:27.70 |
-59:57:49.6 |
HIP 57440 |
15.58 |
| 2026-02-20 00:00 |
11:46:20.24 |
-59:58:13.5 |
HIP 57440 |
15.24 |
| 2026-02-20 12:00 |
11:46:12.74 |
-59:58:36.9 |
HIP 57440 |
14.97 |
| 2026-02-21 00:00 |
11:46:05.20 |
-59:58:59.7 |
HIP 57440 |
14.77 |
| 2026-02-21 12:00 |
11:45:57.63 |
-59:59:21.9 |
HIP 57440 |
14.64 |
| 2026-02-22 00:00 |
11:45:50.03 |
-59:59:43.6 |
HIP 57212 |
14.45 |
| 2026-02-22 12:00 |
11:45:42.39 |
-60:00:04.7 |
HIP 57212 |
13.48 |
| 2026-02-23 00:00 |
11:45:34.72 |
-60:00:25.3 |
HIP 57212 |
12.52 |
| 2026-02-23 12:00 |
11:45:27.02 |
-60:00:45.3 |
HIP 57212 |
11.56 |
| 2026-02-24 00:00 |
11:45:19.29 |
-60:01:04.7 |
HIP 57212 |
10.61 |