| 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) |
| 2026-09-20 00:00 |
12:28:13.38 |
-32:09:14.8 |
HIP 60991 |
24.00 |
| 2026-09-20 12:00 |
12:28:16.94 |
-32:09:29.0 |
HIP 60991 |
23.32 |
| 2026-09-21 00:00 |
12:28:20.50 |
-32:09:43.3 |
HIP 60991 |
22.66 |
| 2026-09-21 12:00 |
12:28:24.06 |
-32:09:57.9 |
HIP 60991 |
22.00 |
| 2026-09-22 00:00 |
12:28:27.63 |
-32:10:12.7 |
HIP 60991 |
21.35 |
| 2026-09-22 12:00 |
12:28:31.21 |
-32:10:27.7 |
HIP 60991 |
20.72 |
| 2026-09-23 00:00 |
12:28:34.78 |
-32:10:43.0 |
HIP 60991 |
20.09 |
| 2026-09-23 12:00 |
12:28:38.36 |
-32:10:58.4 |
HIP 60991 |
19.48 |
| 2026-09-24 00:00 |
12:28:41.95 |
-32:11:14.0 |
HIP 60991 |
18.89 |
| 2026-09-24 12:00 |
12:28:45.53 |
-32:11:29.8 |
HIP 60991 |
18.31 |
| 2026-09-25 00:00 |
12:28:49.12 |
-32:11:45.8 |
HIP 60991 |
17.75 |
| 2026-09-25 12:00 |
12:28:52.71 |
-32:12:02.1 |
HIP 60991 |
17.21 |
| 2026-09-26 00:00 |
12:28:56.31 |
-32:12:18.5 |
HIP 60991 |
16.69 |
| 2026-09-26 12:00 |
12:28:59.90 |
-32:12:35.1 |
HIP 60991 |
16.20 |
| 2026-09-27 00:00 |
12:29:03.50 |
-32:12:51.9 |
HIP 60991 |
15.73 |
| 2026-09-27 12:00 |
12:29:07.10 |
-32:13:08.9 |
HIP 60991 |
15.30 |
| 2026-09-28 00:00 |
12:29:10.71 |
-32:13:26.1 |
HIP 60991 |
14.90 |
| 2026-09-28 12:00 |
12:29:14.31 |
-32:13:43.5 |
HIP 60991 |
14.54 |
| 2026-09-29 00:00 |
12:29:17.91 |
-32:14:01.1 |
HIP 60991 |
14.22 |
| 2026-09-29 12:00 |
12:29:21.52 |
-32:14:18.9 |
HIP 60991 |
13.94 |
| 2026-09-30 00:00 |
12:29:25.13 |
-32:14:36.9 |
HIP 60991 |
13.70 |
| 2026-09-30 12:00 |
12:29:28.73 |
-32:14:55.1 |
HIP 60991 |
13.52 |
| 2026-10-01 00:00 |
12:29:32.34 |
-32:15:13.4 |
HIP 60991 |
13.38 |
| 2026-10-01 12:00 |
12:29:35.95 |
-32:15:32.0 |
HIP 60991 |
13.30 |
| 2026-10-02 00:00 |
12:29:39.56 |
-32:15:50.7 |
HIP 60991 |
13.27 |
| 2026-10-02 12:00 |
12:29:43.16 |
-32:16:09.7 |
HIP 60991 |
13.30 |
| 2026-10-03 00:00 |
12:29:46.77 |
-32:16:28.8 |
HIP 60991 |
13.38 |
| 2026-10-03 12:00 |
12:29:50.38 |
-32:16:48.1 |
HIP 60991 |
13.51 |
| 2026-10-04 00:00 |
12:29:53.98 |
-32:17:07.6 |
HIP 60991 |
13.70 |
| 2026-10-04 12:00 |
12:29:57.58 |
-32:17:27.3 |
HIP 60991 |
13.93 |
| 2026-10-05 00:00 |
12:30:01.19 |
-32:17:47.1 |
HIP 60991 |
14.22 |
| 2026-10-05 12:00 |
12:30:04.79 |
-32:18:07.1 |
HIP 60991 |
14.55 |
| 2026-10-06 00:00 |
12:30:08.39 |
-32:18:27.4 |
HIP 60991 |
14.92 |
| 2026-10-06 12:00 |
12:30:11.98 |
-32:18:47.8 |
HIP 60991 |
15.33 |
| 2026-10-07 00:00 |
12:30:15.58 |
-32:19:08.3 |
HIP 60991 |
15.77 |
| 2026-10-07 12:00 |
12:30:19.17 |
-32:19:29.1 |
HIP 60991 |
16.25 |
| 2026-10-08 00:00 |
12:30:22.76 |
-32:19:50.0 |
HIP 60991 |
16.76 |
| 2026-10-08 12:00 |
12:30:26.34 |
-32:20:11.1 |
HIP 60991 |
17.30 |
| 2026-10-09 00:00 |
12:30:29.93 |
-32:20:32.4 |
HIP 60991 |
17.86 |
| 2026-10-09 12:00 |
12:30:33.51 |
-32:20:53.8 |
HIP 60991 |
18.45 |
| 2026-10-10 00:00 |
12:30:37.08 |
-32:21:15.4 |
HIP 60991 |
19.06 |
| 2026-10-10 12:00 |
12:30:40.65 |
-32:21:37.2 |
HIP 60991 |
19.68 |
| 2026-10-11 00:00 |
12:30:44.22 |
-32:21:59.2 |
HIP 61172 |
19.67 |