C/2004 K1 (Catalina)
| Parameter |
Value |
| Designation |
C/2004 K1 (Catalina) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2005-07-05T02:28:32.972160Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:41Z |
| Obs used |
1117 |
| NEO |
- |
| M1 |
7.900 |
| K1 |
11.000 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2005-05-10.0000000 |
| e |
0.99813226 |
| q (au) |
3.399147 |
| a (au) |
1819.922556 |
| i (deg) |
153.747520 |
| Ω (om, deg) |
326.923197 |
| ω (w, deg) |
97.751687 |
| M (ma, deg) |
359.999288 |
Magnitude
Scatter + Global Linear
$$
M_a = (8.179 + 3.575\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
8.179 |
| n |
3.575 |
| gf |
0.984 |
| gb |
-0.503 |
| k |
1.000 |
| δ90 |
9.996 |
| 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 |
05:40:59.92 |
-00:21:59.5 |
HIP 26686 |
25.04 |
| 2026-02-03 12:00 |
05:40:57.64 |
-00:21:47.1 |
HIP 26686 |
24.99 |
| 2026-02-04 00:00 |
05:40:55.39 |
-00:21:34.7 |
HIP 26686 |
24.96 |
| 2026-02-04 12:00 |
05:40:53.15 |
-00:21:22.1 |
HIP 26686 |
24.94 |
| 2026-02-05 00:00 |
05:40:50.94 |
-00:21:09.4 |
HIP 26686 |
24.95 |
| 2026-02-05 12:00 |
05:40:48.75 |
-00:20:56.6 |
HIP 26686 |
24.97 |
| 2026-02-06 00:00 |
05:40:46.59 |
-00:20:43.7 |
HIP 26686 |
25.01 |
| 2026-02-06 12:00 |
05:40:44.44 |
-00:20:30.7 |
HIP 26686 |
25.07 |
| 2026-02-07 00:00 |
05:40:42.32 |
-00:20:17.5 |
HIP 26686 |
25.14 |
| 2026-02-07 12:00 |
05:40:40.22 |
-00:20:04.3 |
HIP 26686 |
25.23 |
| 2026-02-08 00:00 |
05:40:38.14 |
-00:19:51.0 |
HIP 26686 |
25.33 |
| 2026-02-08 12:00 |
05:40:36.08 |
-00:19:37.5 |
HIP 26686 |
25.45 |
| 2026-02-09 00:00 |
05:40:34.05 |
-00:19:24.0 |
HIP 26686 |
25.58 |
| 2026-02-09 12:00 |
05:40:32.03 |
-00:19:10.4 |
HIP 26686 |
25.73 |
| 2026-02-10 00:00 |
05:40:30.05 |
-00:18:56.6 |
HIP 26686 |
25.88 |
| 2026-02-10 12:00 |
05:40:28.08 |
-00:18:42.8 |
HIP 26686 |
26.06 |
| 2026-02-11 00:00 |
05:40:26.14 |
-00:18:28.9 |
HIP 26686 |
26.24 |
| 2026-02-11 12:00 |
05:40:24.22 |
-00:18:14.8 |
HIP 26686 |
26.44 |
| 2026-02-12 00:00 |
05:40:22.33 |
-00:18:00.7 |
HIP 26686 |
26.64 |
| 2026-02-12 12:00 |
05:40:20.46 |
-00:17:46.5 |
HIP 26686 |
26.86 |
| 2026-02-13 00:00 |
05:40:18.61 |
-00:17:32.2 |
HIP 26686 |
27.09 |
| 2026-02-13 12:00 |
05:40:16.78 |
-00:17:17.8 |
HIP 26686 |
27.33 |
| 2026-02-14 00:00 |
05:40:14.98 |
-00:17:03.3 |
HIP 26526 |
27.18 |
| 2026-02-14 12:00 |
05:40:13.21 |
-00:16:48.8 |
HIP 26526 |
26.68 |
| 2026-02-15 00:00 |
05:40:11.46 |
-00:16:34.1 |
HIP 26526 |
26.19 |
| 2026-02-15 12:00 |
05:40:09.73 |
-00:16:19.4 |
HIP 26526 |
25.70 |
| 2026-02-16 00:00 |
05:40:08.03 |
-00:16:04.5 |
HIP 26526 |
25.23 |
| 2026-02-16 12:00 |
05:40:06.35 |
-00:15:49.6 |
HIP 26526 |
24.75 |
| 2026-02-17 00:00 |
05:40:04.70 |
-00:15:34.6 |
HIP 26526 |
24.29 |
| 2026-02-17 12:00 |
05:40:03.07 |
-00:15:19.6 |
HIP 26526 |
23.83 |
| 2026-02-18 00:00 |
05:40:01.46 |
-00:15:04.4 |
HIP 26526 |
23.37 |
| 2026-02-18 12:00 |
05:39:59.89 |
-00:14:49.2 |
HIP 26526 |
22.92 |
| 2026-02-19 00:00 |
05:39:58.33 |
-00:14:33.9 |
HIP 26526 |
22.48 |
| 2026-02-19 12:00 |
05:39:56.80 |
-00:14:18.5 |
HIP 26526 |
22.05 |
| 2026-02-20 00:00 |
05:39:55.30 |
-00:14:03.1 |
HIP 26526 |
21.62 |
| 2026-02-20 12:00 |
05:39:53.82 |
-00:13:47.6 |
HIP 26526 |
21.20 |
| 2026-02-21 00:00 |
05:39:52.37 |
-00:13:32.0 |
HIP 26526 |
20.79 |
| 2026-02-21 12:00 |
05:39:50.94 |
-00:13:16.3 |
HIP 26526 |
20.38 |
| 2026-02-22 00:00 |
05:39:49.54 |
-00:13:00.6 |
HIP 26526 |
19.99 |
| 2026-02-22 12:00 |
05:39:48.16 |
-00:12:44.8 |
HIP 26526 |
19.60 |
| 2026-02-23 00:00 |
05:39:46.81 |
-00:12:29.0 |
HIP 26526 |
19.21 |
| 2026-02-23 12:00 |
05:39:45.49 |
-00:12:13.0 |
HIP 26526 |
18.84 |
| 2026-02-24 00:00 |
05:39:44.19 |
-00:11:57.1 |
HIP 26526 |
18.47 |