| Parameter |
Value |
| Designation |
C/2007 M2 (Catalina) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2008-12-08T13:33:39.214080Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:09Z |
| Obs used |
432 |
| NEO |
- |
| M1 |
11.900 |
| K1 |
4.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2008-05-25.0000000 |
| e |
0.99933270 |
| q (au) |
3.541046 |
| a (au) |
5306.561037 |
| i (deg) |
80.945662 |
| Ω (om, deg) |
357.282850 |
| ω (w, deg) |
220.668951 |
| M (ma, deg) |
359.999496 |
Magnitude
Scatter + Global Linear
$$
M_a = (14.582 + 2.142\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
14.582 |
| n |
2.142 |
| gf |
1.000 |
| gb |
-0.776 |
| k |
0.800 |
| 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 |
23:52:17.99 |
+02:57:10.1 |
HIP 117683 |
5.21 |
| 2026-06-01 12:00 |
23:52:18.86 |
+02:57:23.1 |
HIP 117683 |
5.48 |
| 2026-06-02 00:00 |
23:52:19.70 |
+02:57:35.9 |
HIP 117683 |
5.74 |
| 2026-06-02 12:00 |
23:52:20.51 |
+02:57:48.6 |
HIP 117683 |
6.00 |
| 2026-06-03 00:00 |
23:52:21.30 |
+02:58:01.1 |
HIP 117683 |
6.26 |
| 2026-06-03 12:00 |
23:52:22.07 |
+02:58:13.5 |
HIP 117683 |
6.51 |
| 2026-06-04 00:00 |
23:52:22.81 |
+02:58:25.7 |
HIP 117683 |
6.76 |
| 2026-06-04 12:00 |
23:52:23.53 |
+02:58:37.8 |
HIP 117683 |
7.00 |
| 2026-06-05 00:00 |
23:52:24.22 |
+02:58:49.7 |
HIP 117683 |
7.24 |
| 2026-06-05 12:00 |
23:52:24.89 |
+02:59:01.5 |
HIP 117683 |
7.48 |
| 2026-06-06 00:00 |
23:52:25.53 |
+02:59:13.1 |
HIP 117683 |
7.70 |
| 2026-06-06 12:00 |
23:52:26.15 |
+02:59:24.6 |
HIP 117683 |
7.93 |
| 2026-06-07 00:00 |
23:52:26.74 |
+02:59:35.9 |
HIP 117683 |
8.14 |
| 2026-06-07 12:00 |
23:52:27.31 |
+02:59:47.0 |
HIP 117683 |
8.36 |
| 2026-06-08 00:00 |
23:52:27.85 |
+02:59:58.0 |
HIP 117683 |
8.56 |
| 2026-06-08 12:00 |
23:52:28.36 |
+03:00:08.9 |
HIP 117683 |
8.76 |
| 2026-06-09 00:00 |
23:52:28.85 |
+03:00:19.6 |
HIP 117683 |
8.96 |
| 2026-06-09 12:00 |
23:52:29.32 |
+03:00:30.1 |
HIP 117683 |
9.15 |
| 2026-06-10 00:00 |
23:52:29.76 |
+03:00:40.5 |
HIP 117683 |
9.33 |
| 2026-06-10 12:00 |
23:52:30.17 |
+03:00:50.7 |
HIP 117683 |
9.51 |
| 2026-06-11 00:00 |
23:52:30.56 |
+03:01:00.8 |
HIP 117683 |
9.68 |
| 2026-06-11 12:00 |
23:52:30.92 |
+03:01:10.7 |
HIP 117683 |
9.84 |
| 2026-06-12 00:00 |
23:52:31.26 |
+03:01:20.4 |
HIP 117683 |
10.00 |
| 2026-06-12 12:00 |
23:52:31.57 |
+03:01:30.0 |
HIP 117683 |
10.16 |
| 2026-06-13 00:00 |
23:52:31.86 |
+03:01:39.4 |
HIP 117683 |
10.30 |
| 2026-06-13 12:00 |
23:52:32.12 |
+03:01:48.6 |
HIP 117683 |
10.44 |
| 2026-06-14 00:00 |
23:52:32.35 |
+03:01:57.7 |
HIP 117683 |
10.58 |
| 2026-06-14 12:00 |
23:52:32.55 |
+03:02:06.6 |
HIP 117683 |
10.71 |
| 2026-06-15 00:00 |
23:52:32.74 |
+03:02:15.4 |
HIP 117683 |
10.83 |
| 2026-06-15 12:00 |
23:52:32.89 |
+03:02:24.0 |
HIP 117683 |
10.95 |
| 2026-06-16 00:00 |
23:52:33.02 |
+03:02:32.4 |
HIP 117683 |
11.06 |
| 2026-06-16 12:00 |
23:52:33.12 |
+03:02:40.7 |
HIP 117683 |
11.16 |
| 2026-06-17 00:00 |
23:52:33.20 |
+03:02:48.8 |
HIP 117683 |
11.26 |
| 2026-06-17 12:00 |
23:52:33.25 |
+03:02:56.7 |
HIP 117683 |
11.35 |
| 2026-06-18 00:00 |
23:52:33.27 |
+03:03:04.5 |
HIP 117683 |
11.44 |
| 2026-06-18 12:00 |
23:52:33.27 |
+03:03:12.1 |
HIP 117683 |
11.52 |
| 2026-06-19 00:00 |
23:52:33.24 |
+03:03:19.5 |
HIP 117683 |
11.59 |
| 2026-06-19 12:00 |
23:52:33.18 |
+03:03:26.8 |
HIP 117683 |
11.66 |
| 2026-06-20 00:00 |
23:52:33.10 |
+03:03:33.9 |
HIP 117683 |
11.72 |
| 2026-06-20 12:00 |
23:52:32.99 |
+03:03:40.8 |
HIP 117683 |
11.78 |
| 2026-06-21 00:00 |
23:52:32.86 |
+03:03:47.6 |
HIP 117683 |
11.83 |
| 2026-06-21 12:00 |
23:52:32.70 |
+03:03:54.2 |
HIP 117683 |
11.88 |
| 2026-06-22 00:00 |
23:52:32.51 |
+03:04:00.6 |
HIP 117683 |
11.92 |