| Parameter |
Value |
| Designation |
C/2006 OF2 (Broughton) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2008-09-15T16:27:21.395520Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:59Z |
| Obs used |
4756 |
| NEO |
- |
| M1 |
9.600 |
| K1 |
5.250 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2008-07-16.0000000 |
| e |
1.00078340 |
| q (au) |
2.431442 |
| a (au) |
-3103.701825 |
| i (deg) |
30.170433 |
| Ω (om, deg) |
318.508724 |
| ω (w, deg) |
95.611765 |
| M (ma, deg) |
-0.000352 |
Magnitude
Scatter + Global Linear
$$
M_a = (7.286 + 3.919\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
7.286 |
| n |
3.919 |
| gf |
1.000 |
| gb |
-0.703 |
| 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
Residuals (Piecewise)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| Start (UTC) |
End (UTC) |
a |
b |
| 2007-08-05 |
2008-09-10 |
-1.1552 |
+1.003 |
| 2008-09-22 |
2009-01-13 |
-12.3341 |
+5.132 |
| 2009-01-13 |
2011-01-09 |
+4.4199 |
-2.467 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-03-26 00:00 |
12:28:48.06 |
-33:39:35.1 |
HIP 60864 |
19.85 |
| 2026-03-26 12:00 |
12:28:44.51 |
-33:39:21.3 |
HIP 60864 |
19.96 |
| 2026-03-27 00:00 |
12:28:40.96 |
-33:39:07.2 |
HIP 60864 |
20.11 |
| 2026-03-27 12:00 |
12:28:37.41 |
-33:38:52.8 |
HIP 60864 |
20.28 |
| 2026-03-28 00:00 |
12:28:33.86 |
-33:38:38.3 |
HIP 60864 |
20.49 |
| 2026-03-28 12:00 |
12:28:30.31 |
-33:38:23.5 |
HIP 60864 |
20.72 |
| 2026-03-29 00:00 |
12:28:26.76 |
-33:38:08.5 |
HIP 60864 |
20.99 |
| 2026-03-29 12:00 |
12:28:23.20 |
-33:37:53.3 |
HIP 60864 |
21.29 |
| 2026-03-30 00:00 |
12:28:19.65 |
-33:37:37.8 |
HIP 60864 |
21.61 |
| 2026-03-30 12:00 |
12:28:16.11 |
-33:37:22.1 |
HIP 60864 |
21.96 |
| 2026-03-31 00:00 |
12:28:12.56 |
-33:37:06.2 |
HIP 60864 |
22.34 |
| 2026-03-31 12:00 |
12:28:09.01 |
-33:36:50.1 |
HIP 60864 |
22.74 |
| 2026-04-01 00:00 |
12:28:05.47 |
-33:36:33.7 |
HIP 60864 |
23.16 |
| 2026-04-01 12:00 |
12:28:01.93 |
-33:36:17.1 |
HIP 60864 |
23.61 |
| 2026-04-02 00:00 |
12:27:58.39 |
-33:36:00.4 |
HIP 60864 |
24.07 |
| 2026-04-02 12:00 |
12:27:54.86 |
-33:35:43.4 |
HIP 60864 |
24.56 |
| 2026-04-03 00:00 |
12:27:51.32 |
-33:35:26.1 |
HIP 60864 |
25.06 |
| 2026-04-03 12:00 |
12:27:47.79 |
-33:35:08.7 |
HIP 60864 |
25.58 |
| 2026-04-04 00:00 |
12:27:44.27 |
-33:34:51.1 |
HIP 60864 |
26.12 |
| 2026-04-04 12:00 |
12:27:40.75 |
-33:34:33.2 |
HIP 60864 |
26.68 |
| 2026-04-05 00:00 |
12:27:37.23 |
-33:34:15.2 |
HIP 60864 |
27.24 |
| 2026-04-05 12:00 |
12:27:33.72 |
-33:33:56.9 |
HIP 60864 |
27.83 |
| 2026-04-06 00:00 |
12:27:30.21 |
-33:33:38.4 |
HIP 60864 |
28.42 |
| 2026-04-06 12:00 |
12:27:26.71 |
-33:33:19.8 |
HIP 60864 |
29.03 |
| 2026-04-07 00:00 |
12:27:23.21 |
-33:33:00.9 |
HIP 60864 |
29.64 |
| 2026-04-07 12:00 |
12:27:19.72 |
-33:32:41.8 |
HIP 60864 |
30.27 |
| 2026-04-08 00:00 |
12:27:16.24 |
-33:32:22.5 |
HIP 60864 |
30.91 |
| 2026-04-08 12:00 |
12:27:12.76 |
-33:32:03.1 |
HIP 60864 |
31.56 |
| 2026-04-09 00:00 |
12:27:09.29 |
-33:31:43.4 |
HIP 60864 |
32.21 |
| 2026-04-09 12:00 |
12:27:05.83 |
-33:31:23.5 |
HIP 60864 |
32.87 |
| 2026-04-10 00:00 |
12:27:02.37 |
-33:31:03.5 |
HIP 60864 |
33.55 |
| 2026-04-10 12:00 |
12:26:58.92 |
-33:30:43.3 |
HIP 60594 |
33.73 |
| 2026-04-11 00:00 |
12:26:55.48 |
-33:30:22.8 |
HIP 60594 |
33.00 |
| 2026-04-11 12:00 |
12:26:52.04 |
-33:30:02.2 |
HIP 60594 |
32.27 |
| 2026-04-12 00:00 |
12:26:48.62 |
-33:29:41.4 |
HIP 60594 |
31.54 |
| 2026-04-12 12:00 |
12:26:45.20 |
-33:29:20.5 |
HIP 60594 |
30.82 |
| 2026-04-13 00:00 |
12:26:41.79 |
-33:28:59.3 |
HIP 60594 |
30.09 |
| 2026-04-13 12:00 |
12:26:38.39 |
-33:28:38.0 |
HIP 60594 |
29.37 |
| 2026-04-14 00:00 |
12:26:35.00 |
-33:28:16.4 |
HIP 60594 |
28.66 |
| 2026-04-14 12:00 |
12:26:31.63 |
-33:27:54.8 |
HIP 60594 |
27.94 |
| 2026-04-15 00:00 |
12:26:28.26 |
-33:27:32.9 |
HIP 60594 |
27.23 |
| 2026-04-15 12:00 |
12:26:24.90 |
-33:27:10.9 |
HIP 60594 |
26.52 |
| 2026-04-16 00:00 |
12:26:21.55 |
-33:26:48.7 |
HIP 60594 |
25.82 |