| 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) |
| 2026-05-12 00:00 |
11:15:08.50 |
+09:34:19.8 |
HIP 54978 |
16.81 |
| 2026-05-12 12:00 |
11:15:07.21 |
+09:34:25.1 |
HIP 54978 |
16.99 |
| 2026-05-13 00:00 |
11:15:05.94 |
+09:34:30.3 |
HIP 54978 |
17.16 |
| 2026-05-13 12:00 |
11:15:04.70 |
+09:34:35.2 |
HIP 54978 |
17.34 |
| 2026-05-14 00:00 |
11:15:03.48 |
+09:34:40.0 |
HIP 54978 |
17.51 |
| 2026-05-14 12:00 |
11:15:02.29 |
+09:34:44.6 |
HIP 54978 |
17.68 |
| 2026-05-15 00:00 |
11:15:01.12 |
+09:34:49.1 |
HIP 54978 |
17.85 |
| 2026-05-15 12:00 |
11:14:59.98 |
+09:34:53.3 |
HIP 54978 |
18.02 |
| 2026-05-16 00:00 |
11:14:58.86 |
+09:34:57.4 |
HIP 54978 |
18.19 |
| 2026-05-16 12:00 |
11:14:57.78 |
+09:35:01.3 |
HIP 54978 |
18.35 |
| 2026-05-17 00:00 |
11:14:56.71 |
+09:35:05.0 |
HIP 54978 |
18.52 |
| 2026-05-17 12:00 |
11:14:55.68 |
+09:35:08.6 |
HIP 54978 |
18.68 |
| 2026-05-18 00:00 |
11:14:54.67 |
+09:35:12.0 |
HIP 54978 |
18.83 |
| 2026-05-18 12:00 |
11:14:53.68 |
+09:35:15.2 |
HIP 54978 |
18.98 |
| 2026-05-19 00:00 |
11:14:52.73 |
+09:35:18.2 |
HIP 54978 |
19.13 |
| 2026-05-19 12:00 |
11:14:51.80 |
+09:35:21.0 |
HIP 54978 |
19.28 |
| 2026-05-20 00:00 |
11:14:50.89 |
+09:35:23.7 |
HIP 54978 |
19.42 |
| 2026-05-20 12:00 |
11:14:50.01 |
+09:35:26.2 |
HIP 54978 |
19.56 |
| 2026-05-21 00:00 |
11:14:49.16 |
+09:35:28.5 |
HIP 54978 |
19.69 |
| 2026-05-21 12:00 |
11:14:48.34 |
+09:35:30.7 |
HIP 54978 |
19.82 |
| 2026-05-22 00:00 |
11:14:47.54 |
+09:35:32.6 |
HIP 54978 |
19.94 |
| 2026-05-22 12:00 |
11:14:46.77 |
+09:35:34.4 |
HIP 54978 |
20.06 |
| 2026-05-23 00:00 |
11:14:46.03 |
+09:35:36.1 |
HIP 54978 |
20.18 |
| 2026-05-23 12:00 |
11:14:45.31 |
+09:35:37.5 |
HIP 54978 |
20.29 |
| 2026-05-24 00:00 |
11:14:44.62 |
+09:35:38.8 |
HIP 54978 |
20.39 |
| 2026-05-24 12:00 |
11:14:43.95 |
+09:35:39.8 |
HIP 54978 |
20.49 |
| 2026-05-25 00:00 |
11:14:43.32 |
+09:35:40.8 |
HIP 54978 |
20.59 |
| 2026-05-25 12:00 |
11:14:42.71 |
+09:35:41.5 |
HIP 54978 |
20.68 |
| 2026-05-26 00:00 |
11:14:42.12 |
+09:35:42.1 |
HIP 54978 |
20.76 |
| 2026-05-26 12:00 |
11:14:41.57 |
+09:35:42.5 |
HIP 54978 |
20.84 |
| 2026-05-27 00:00 |
11:14:41.04 |
+09:35:42.7 |
HIP 54978 |
20.92 |
| 2026-05-27 12:00 |
11:14:40.53 |
+09:35:42.7 |
HIP 54978 |
20.98 |
| 2026-05-28 00:00 |
11:14:40.06 |
+09:35:42.6 |
HIP 54978 |
21.05 |
| 2026-05-28 12:00 |
11:14:39.61 |
+09:35:42.3 |
HIP 54978 |
21.10 |
| 2026-05-29 00:00 |
11:14:39.18 |
+09:35:41.8 |
HIP 54978 |
21.16 |
| 2026-05-29 12:00 |
11:14:38.79 |
+09:35:41.2 |
HIP 54978 |
21.20 |
| 2026-05-30 00:00 |
11:14:38.42 |
+09:35:40.4 |
HIP 54978 |
21.24 |
| 2026-05-30 12:00 |
11:14:38.08 |
+09:35:39.4 |
HIP 54978 |
21.28 |
| 2026-05-31 00:00 |
11:14:37.76 |
+09:35:38.2 |
HIP 54978 |
21.30 |
| 2026-05-31 12:00 |
11:14:37.48 |
+09:35:36.9 |
HIP 54978 |
21.33 |
| 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 |