| 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) |
| 2026-06-01 00:00 |
11:14:37.21 |
+09:35:35.4 |
HIP 54978 |
21.34 |
| 2026-06-01 12:00 |
11:14:36.98 |
+09:35:33.8 |
HIP 54978 |
21.35 |
| 2026-06-02 00:00 |
11:14:36.77 |
+09:35:31.9 |
HIP 54978 |
21.36 |
| 2026-06-02 12:00 |
11:14:36.59 |
+09:35:29.9 |
HIP 54978 |
21.36 |
| 2026-06-03 00:00 |
11:14:36.44 |
+09:35:27.7 |
HIP 54978 |
21.35 |
| 2026-06-03 12:00 |
11:14:36.31 |
+09:35:25.4 |
HIP 54978 |
21.34 |
| 2026-06-04 00:00 |
11:14:36.21 |
+09:35:22.9 |
HIP 54978 |
21.32 |
| 2026-06-04 12:00 |
11:14:36.14 |
+09:35:20.2 |
HIP 54978 |
21.29 |
| 2026-06-05 00:00 |
11:14:36.09 |
+09:35:17.3 |
HIP 54978 |
21.26 |
| 2026-06-05 12:00 |
11:14:36.07 |
+09:35:14.3 |
HIP 54978 |
21.22 |
| 2026-06-06 00:00 |
11:14:36.08 |
+09:35:11.1 |
HIP 54978 |
21.18 |
| 2026-06-06 12:00 |
11:14:36.12 |
+09:35:07.7 |
HIP 54978 |
21.13 |
| 2026-06-07 00:00 |
11:14:36.18 |
+09:35:04.2 |
HIP 54978 |
21.07 |
| 2026-06-07 12:00 |
11:14:36.27 |
+09:35:00.5 |
HIP 54978 |
21.01 |
| 2026-06-08 00:00 |
11:14:36.38 |
+09:34:56.6 |
HIP 54978 |
20.94 |
| 2026-06-08 12:00 |
11:14:36.52 |
+09:34:52.6 |
HIP 54978 |
20.87 |
| 2026-06-09 00:00 |
11:14:36.69 |
+09:34:48.4 |
HIP 54978 |
20.79 |
| 2026-06-09 12:00 |
11:14:36.89 |
+09:34:44.0 |
HIP 54978 |
20.70 |
| 2026-06-10 00:00 |
11:14:37.11 |
+09:34:39.5 |
HIP 54978 |
20.61 |
| 2026-06-10 12:00 |
11:14:37.36 |
+09:34:34.8 |
HIP 54978 |
20.51 |
| 2026-06-11 00:00 |
11:14:37.64 |
+09:34:30.0 |
HIP 54978 |
20.40 |
| 2026-06-11 12:00 |
11:14:37.94 |
+09:34:24.9 |
HIP 54978 |
20.29 |
| 2026-06-12 00:00 |
11:14:38.27 |
+09:34:19.8 |
HIP 54978 |
20.17 |
| 2026-06-12 12:00 |
11:14:38.63 |
+09:34:14.4 |
HIP 54978 |
20.05 |
| 2026-06-13 00:00 |
11:14:39.01 |
+09:34:08.9 |
HIP 54978 |
19.92 |
| 2026-06-13 12:00 |
11:14:39.42 |
+09:34:03.2 |
HIP 54978 |
19.78 |
| 2026-06-14 00:00 |
11:14:39.86 |
+09:33:57.4 |
HIP 54978 |
19.64 |
| 2026-06-14 12:00 |
11:14:40.32 |
+09:33:51.4 |
HIP 54978 |
19.49 |
| 2026-06-15 00:00 |
11:14:40.81 |
+09:33:45.2 |
HIP 54978 |
19.33 |
| 2026-06-15 12:00 |
11:14:41.33 |
+09:33:38.9 |
HIP 54978 |
19.17 |
| 2026-06-16 00:00 |
11:14:41.87 |
+09:33:32.4 |
HIP 54978 |
19.01 |
| 2026-06-16 12:00 |
11:14:42.44 |
+09:33:25.8 |
HIP 54978 |
18.84 |
| 2026-06-17 00:00 |
11:14:43.04 |
+09:33:18.9 |
HIP 54978 |
18.66 |
| 2026-06-17 12:00 |
11:14:43.66 |
+09:33:12.0 |
HIP 54978 |
18.47 |
| 2026-06-18 00:00 |
11:14:44.31 |
+09:33:04.9 |
HIP 54978 |
18.29 |
| 2026-06-18 12:00 |
11:14:44.99 |
+09:32:57.6 |
HIP 54978 |
18.09 |
| 2026-06-19 00:00 |
11:14:45.69 |
+09:32:50.2 |
HIP 54978 |
17.89 |
| 2026-06-19 12:00 |
11:14:46.41 |
+09:32:42.6 |
HIP 54978 |
17.68 |
| 2026-06-20 00:00 |
11:14:47.17 |
+09:32:34.8 |
HIP 54978 |
17.47 |
| 2026-06-20 12:00 |
11:14:47.95 |
+09:32:26.9 |
HIP 54978 |
17.26 |
| 2026-06-21 00:00 |
11:14:48.75 |
+09:32:18.9 |
HIP 54978 |
17.03 |
| 2026-06-21 12:00 |
11:14:49.58 |
+09:32:10.7 |
HIP 54978 |
16.81 |
| 2026-06-22 00:00 |
11:14:50.44 |
+09:32:02.4 |
HIP 54978 |
16.57 |