C/2005 N5 (Catalina)
| Parameter |
Value |
| Designation |
C/2005 N5 (Catalina) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2005-08-22T16:21:26.827200Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:51Z |
| Obs used |
233 |
| NEO |
- |
| M1 |
16.000 |
| K1 |
4.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2005-09-18.0000000 |
| e |
0.94327002 |
| q (au) |
1.627399 |
| a (au) |
28.686757 |
| i (deg) |
21.378745 |
| Ω (om, deg) |
156.411335 |
| ω (w, deg) |
207.765233 |
| M (ma, deg) |
0.168827 |
Magnitude
Scatter + Global Linear
$$
M_a = (15.595 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
15.595 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
0.994 |
| 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 |
11:23:51.41 |
+08:38:56.9 |
HIP 55625 |
5.39 |
| 2026-02-03 12:00 |
11:23:48.88 |
+08:39:16.6 |
HIP 55625 |
5.57 |
| 2026-02-04 00:00 |
11:23:46.34 |
+08:39:36.4 |
HIP 55625 |
5.83 |
| 2026-02-04 12:00 |
11:23:43.78 |
+08:39:56.2 |
HIP 55625 |
6.17 |
| 2026-02-05 00:00 |
11:23:41.20 |
+08:40:16.2 |
HIP 55625 |
6.56 |
| 2026-02-05 12:00 |
11:23:38.60 |
+08:40:36.2 |
HIP 55625 |
7.01 |
| 2026-02-06 00:00 |
11:23:35.99 |
+08:40:56.3 |
HIP 55625 |
7.51 |
| 2026-02-06 12:00 |
11:23:33.36 |
+08:41:16.4 |
HIP 55625 |
8.04 |
| 2026-02-07 00:00 |
11:23:30.71 |
+08:41:36.7 |
HIP 55625 |
8.61 |
| 2026-02-07 12:00 |
11:23:28.05 |
+08:41:57.0 |
HIP 55625 |
9.20 |
| 2026-02-08 00:00 |
11:23:25.37 |
+08:42:17.3 |
HIP 55625 |
9.81 |
| 2026-02-08 12:00 |
11:23:22.67 |
+08:42:37.8 |
HIP 55625 |
10.45 |
| 2026-02-09 00:00 |
11:23:19.96 |
+08:42:58.3 |
HIP 55625 |
11.10 |
| 2026-02-09 12:00 |
11:23:17.24 |
+08:43:18.8 |
HIP 55625 |
11.77 |
| 2026-02-10 00:00 |
11:23:14.50 |
+08:43:39.4 |
HIP 55625 |
12.45 |
| 2026-02-10 12:00 |
11:23:11.74 |
+08:44:00.1 |
HIP 55625 |
13.14 |
| 2026-02-11 00:00 |
11:23:08.97 |
+08:44:20.9 |
HIP 55625 |
13.85 |
| 2026-02-11 12:00 |
11:23:06.18 |
+08:44:41.7 |
HIP 55625 |
14.56 |
| 2026-02-12 00:00 |
11:23:03.38 |
+08:45:02.5 |
HIP 55625 |
15.28 |
| 2026-02-12 12:00 |
11:23:00.57 |
+08:45:23.4 |
HIP 55625 |
16.01 |
| 2026-02-13 00:00 |
11:22:57.74 |
+08:45:44.4 |
HIP 55625 |
16.74 |
| 2026-02-13 12:00 |
11:22:54.90 |
+08:46:05.4 |
HIP 55625 |
17.49 |
| 2026-02-14 00:00 |
11:22:52.05 |
+08:46:26.4 |
HIP 55625 |
18.24 |
| 2026-02-14 12:00 |
11:22:49.18 |
+08:46:47.5 |
HIP 55511 |
18.13 |
| 2026-02-15 00:00 |
11:22:46.30 |
+08:47:08.6 |
HIP 55511 |
17.45 |
| 2026-02-15 12:00 |
11:22:43.40 |
+08:47:29.8 |
HIP 55511 |
16.77 |
| 2026-02-16 00:00 |
11:22:40.50 |
+08:47:51.0 |
HIP 55511 |
16.11 |
| 2026-02-16 12:00 |
11:22:37.58 |
+08:48:12.3 |
HIP 55511 |
15.45 |
| 2026-02-17 00:00 |
11:22:34.65 |
+08:48:33.6 |
HIP 55511 |
14.81 |
| 2026-02-17 12:00 |
11:22:31.71 |
+08:48:54.9 |
HIP 55511 |
14.18 |
| 2026-02-18 00:00 |
11:22:28.76 |
+08:49:16.2 |
HIP 55511 |
13.57 |
| 2026-02-18 12:00 |
11:22:25.80 |
+08:49:37.6 |
HIP 55511 |
12.98 |
| 2026-02-19 00:00 |
11:22:22.83 |
+08:49:59.0 |
HIP 55511 |
12.41 |
| 2026-02-19 12:00 |
11:22:19.84 |
+08:50:20.5 |
HIP 55511 |
11.87 |
| 2026-02-20 00:00 |
11:22:16.85 |
+08:50:41.9 |
HIP 55511 |
11.37 |
| 2026-02-20 12:00 |
11:22:13.85 |
+08:51:03.4 |
HIP 55511 |
10.90 |
| 2026-02-21 00:00 |
11:22:10.84 |
+08:51:24.9 |
HIP 55511 |
10.48 |
| 2026-02-21 12:00 |
11:22:07.81 |
+08:51:46.4 |
HIP 55511 |
10.10 |
| 2026-02-22 00:00 |
11:22:04.78 |
+08:52:08.0 |
HIP 55511 |
9.78 |
| 2026-02-22 12:00 |
11:22:01.74 |
+08:52:29.5 |
HIP 55511 |
9.53 |
| 2026-02-23 00:00 |
11:21:58.70 |
+08:52:51.1 |
HIP 55511 |
9.34 |
| 2026-02-23 12:00 |
11:21:55.64 |
+08:53:12.6 |
HIP 55511 |
9.22 |
| 2026-02-24 00:00 |
11:21:52.58 |
+08:53:34.2 |
HIP 55511 |
9.18 |