509P/Catalina
| Parameter |
Value |
| Designation |
509P/Catalina |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2007-09-07T11:59:03.226560Z |
| Orbit solution date (soln_date, UTC) |
2026-01-13T08:12:54Z |
| Obs used |
503 |
| NEO |
- |
| M1 |
7.000 |
| K1 |
16.000 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2024-10-03T12:33:08.928000Z |
| Discovery magnitude (MPC) |
22.18 G |
| Discovery observatory (MPC) |
F51 · Pan-STARRS 1, Haleakala |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2015-04-02.0000000 |
| e |
0.46374762 |
| q (au) |
3.765097 |
| a (au) |
7.021128 |
| i (deg) |
8.705357 |
| Ω (om, deg) |
275.829021 |
| ω (w, deg) |
179.552553 |
| M (ma, deg) |
146.404117 |
Magnitude
Scatter + Global Linear
$$
M_a = (7.550 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
7.550 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.976 |
| 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 |
04:52:37.77 |
+23:52:24.5 |
HIP 22653 |
8.09 |
| 2026-02-03 12:00 |
04:52:41.51 |
+23:51:27.0 |
HIP 22653 |
7.69 |
| 2026-02-04 00:00 |
04:52:45.55 |
+23:50:30.1 |
HIP 22653 |
7.54 |
| 2026-02-04 12:00 |
04:52:49.88 |
+23:49:34.0 |
HIP 22653 |
7.68 |
| 2026-02-05 00:00 |
04:52:54.50 |
+23:48:38.4 |
HIP 22653 |
8.12 |
| 2026-02-05 12:00 |
04:52:59.41 |
+23:47:43.5 |
HIP 22653 |
8.83 |
| 2026-02-06 00:00 |
04:53:04.62 |
+23:46:49.3 |
HIP 22653 |
9.77 |
| 2026-02-06 12:00 |
04:53:10.11 |
+23:45:55.7 |
HIP 22653 |
10.91 |
| 2026-02-07 00:00 |
04:53:15.89 |
+23:45:02.7 |
HIP 22653 |
12.20 |
| 2026-02-07 12:00 |
04:53:21.97 |
+23:44:10.4 |
HIP 22653 |
13.62 |
| 2026-02-08 00:00 |
04:53:28.33 |
+23:43:18.8 |
HIP 22653 |
15.15 |
| 2026-02-08 12:00 |
04:53:34.98 |
+23:42:27.7 |
HIP 22653 |
16.78 |
| 2026-02-09 00:00 |
04:53:41.92 |
+23:41:37.4 |
HIP 22653 |
18.49 |
| 2026-02-09 12:00 |
04:53:49.14 |
+23:40:47.6 |
HIP 22801 |
19.26 |
| 2026-02-10 00:00 |
04:53:56.65 |
+23:39:58.5 |
HIP 22801 |
19.56 |
| 2026-02-10 12:00 |
04:54:04.45 |
+23:39:10.1 |
HIP 22801 |
20.01 |
| 2026-02-11 00:00 |
04:54:12.53 |
+23:38:22.2 |
HIP 22801 |
20.63 |
| 2026-02-11 12:00 |
04:54:20.90 |
+23:37:35.0 |
HIP 22801 |
21.41 |
| 2026-02-12 00:00 |
04:54:29.55 |
+23:36:48.5 |
HIP 22743 |
21.93 |
| 2026-02-12 12:00 |
04:54:38.48 |
+23:36:02.5 |
HIP 22743 |
22.59 |
| 2026-02-13 00:00 |
04:54:47.70 |
+23:35:17.2 |
HIP 22743 |
23.50 |
| 2026-02-13 12:00 |
04:54:57.20 |
+23:34:32.5 |
HIP 22743 |
24.63 |
| 2026-02-14 00:00 |
04:55:06.98 |
+23:33:48.4 |
HIP 22972 |
25.92 |
| 2026-02-14 12:00 |
04:55:17.04 |
+23:33:04.9 |
HIP 22972 |
23.67 |
| 2026-02-15 00:00 |
04:55:27.38 |
+23:32:22.0 |
HIP 22972 |
21.43 |
| 2026-02-15 12:00 |
04:55:38.00 |
+23:31:39.7 |
HIP 22972 |
19.20 |
| 2026-02-16 00:00 |
04:55:48.89 |
+23:30:58.0 |
HIP 22972 |
17.02 |
| 2026-02-16 12:00 |
04:56:00.06 |
+23:30:16.9 |
HIP 22972 |
14.96 |
| 2026-02-17 00:00 |
04:56:11.51 |
+23:29:36.4 |
HIP 22972 |
13.08 |
| 2026-02-17 12:00 |
04:56:23.23 |
+23:28:56.5 |
HIP 22972 |
11.54 |
| 2026-02-18 00:00 |
04:56:35.22 |
+23:28:17.1 |
HIP 22972 |
10.53 |
| 2026-02-18 12:00 |
04:56:47.49 |
+23:27:38.3 |
HIP 22972 |
10.25 |
| 2026-02-19 00:00 |
04:57:00.03 |
+23:27:00.1 |
HIP 22972 |
10.80 |
| 2026-02-19 12:00 |
04:57:12.84 |
+23:26:22.5 |
HIP 22972 |
12.12 |
| 2026-02-20 00:00 |
04:57:25.91 |
+23:25:45.4 |
HIP 22972 |
14.03 |
| 2026-02-20 12:00 |
04:57:39.26 |
+23:25:08.8 |
HIP 22972 |
16.35 |
| 2026-02-21 00:00 |
04:57:52.87 |
+23:24:32.8 |
HIP 22972 |
18.97 |
| 2026-02-21 12:00 |
04:58:06.74 |
+23:23:57.3 |
HIP 22972 |
21.80 |
| 2026-02-22 00:00 |
04:58:20.88 |
+23:23:22.4 |
HIP 22972 |
24.79 |
| 2026-02-22 12:00 |
04:58:35.29 |
+23:22:48.0 |
HIP 23150 |
27.67 |
| 2026-02-23 00:00 |
04:58:49.95 |
+23:22:14.0 |
HIP 23150 |
27.97 |
| 2026-02-23 12:00 |
04:59:04.87 |
+23:21:40.6 |
HIP 23333 |
28.64 |
| 2026-02-24 00:00 |
04:59:20.05 |
+23:21:07.7 |
HIP 23333 |
25.31 |