| Parameter |
Value |
| Designation |
C/2006 Q1 (McNaught) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2008-07-03T20:33:15.033600Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:00Z |
| Obs used |
2710 |
| NEO |
- |
| M1 |
9.300 |
| K1 |
4.750 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2009-02-17.0000000 |
| e |
0.99960042 |
| q (au) |
2.763713 |
| a (au) |
6916.474116 |
| i (deg) |
59.050363 |
| Ω (om, deg) |
199.547074 |
| ω (w, deg) |
344.381853 |
| M (ma, deg) |
0.000391 |
Magnitude
Scatter + Global Linear
$$
M_a = (10.125 + 2.335\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
10.125 |
| n |
2.335 |
| gf |
0.943 |
| gb |
-0.656 |
| k |
0.906 |
| δ90 |
6.533 |
| 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 |
| 2006-08-20 |
2008-01-29 |
+0.9412 |
-1.227 |
| 2008-01-29 |
2008-07-01 |
-6.8432 |
+2.139 |
| 2008-07-03 |
2009-07-06 |
+2.3103 |
-1.470 |
| 2009-07-06 |
2010-10-17 |
+3.1514 |
-2.364 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-05-12 00:00 |
22:21:39.98 |
+32:09:19.0 |
HIP 110526 |
29.39 |
| 2026-05-12 12:00 |
22:21:41.00 |
+32:09:52.6 |
HIP 110526 |
28.88 |
| 2026-05-13 00:00 |
22:21:41.99 |
+32:10:26.2 |
HIP 110526 |
28.37 |
| 2026-05-13 12:00 |
22:21:42.95 |
+32:10:59.8 |
HIP 110526 |
27.87 |
| 2026-05-14 00:00 |
22:21:43.89 |
+32:11:33.3 |
HIP 110526 |
27.38 |
| 2026-05-14 12:00 |
22:21:44.79 |
+32:12:06.7 |
HIP 110526 |
26.90 |
| 2026-05-15 00:00 |
22:21:45.66 |
+32:12:40.1 |
HIP 110526 |
26.43 |
| 2026-05-15 12:00 |
22:21:46.51 |
+32:13:13.4 |
HIP 110526 |
25.97 |
| 2026-05-16 00:00 |
22:21:47.32 |
+32:13:46.7 |
HIP 110526 |
25.52 |
| 2026-05-16 12:00 |
22:21:48.11 |
+32:14:19.9 |
HIP 110526 |
25.09 |
| 2026-05-17 00:00 |
22:21:48.86 |
+32:14:53.1 |
HIP 110526 |
24.66 |
| 2026-05-17 12:00 |
22:21:49.58 |
+32:15:26.2 |
HIP 110526 |
24.25 |
| 2026-05-18 00:00 |
22:21:50.28 |
+32:15:59.2 |
HIP 110526 |
23.85 |
| 2026-05-18 12:00 |
22:21:50.94 |
+32:16:32.1 |
HIP 110526 |
23.46 |
| 2026-05-19 00:00 |
22:21:51.58 |
+32:17:05.0 |
HIP 110526 |
23.09 |
| 2026-05-19 12:00 |
22:21:52.18 |
+32:17:37.8 |
HIP 110526 |
22.73 |
| 2026-05-20 00:00 |
22:21:52.76 |
+32:18:10.5 |
HIP 110526 |
22.38 |
| 2026-05-20 12:00 |
22:21:53.30 |
+32:18:43.2 |
HIP 110526 |
22.05 |
| 2026-05-21 00:00 |
22:21:53.81 |
+32:19:15.7 |
HIP 110526 |
21.74 |
| 2026-05-21 12:00 |
22:21:54.30 |
+32:19:48.2 |
HIP 110526 |
21.44 |
| 2026-05-22 00:00 |
22:21:54.75 |
+32:20:20.6 |
HIP 110526 |
21.16 |
| 2026-05-22 12:00 |
22:21:55.17 |
+32:20:52.9 |
HIP 110526 |
20.90 |
| 2026-05-23 00:00 |
22:21:55.57 |
+32:21:25.1 |
HIP 110526 |
20.65 |
| 2026-05-23 12:00 |
22:21:55.93 |
+32:21:57.2 |
HIP 110526 |
20.42 |
| 2026-05-24 00:00 |
22:21:56.26 |
+32:22:29.2 |
HIP 110526 |
20.21 |
| 2026-05-24 12:00 |
22:21:56.56 |
+32:23:01.2 |
HIP 110526 |
20.02 |
| 2026-05-25 00:00 |
22:21:56.84 |
+32:23:33.0 |
HIP 110526 |
19.85 |
| 2026-05-25 12:00 |
22:21:57.08 |
+32:24:04.7 |
HIP 110526 |
19.70 |
| 2026-05-26 00:00 |
22:21:57.29 |
+32:24:36.3 |
HIP 110526 |
19.57 |
| 2026-05-26 12:00 |
22:21:57.47 |
+32:25:07.8 |
HIP 110526 |
19.45 |
| 2026-05-27 00:00 |
22:21:57.62 |
+32:25:39.2 |
HIP 110526 |
19.36 |
| 2026-05-27 12:00 |
22:21:57.74 |
+32:26:10.5 |
HIP 110526 |
19.29 |
| 2026-05-28 00:00 |
22:21:57.83 |
+32:26:41.6 |
HIP 110526 |
19.24 |
| 2026-05-28 12:00 |
22:21:57.89 |
+32:27:12.7 |
HIP 110526 |
19.21 |
| 2026-05-29 00:00 |
22:21:57.92 |
+32:27:43.6 |
HIP 110526 |
19.20 |
| 2026-05-29 12:00 |
22:21:57.92 |
+32:28:14.4 |
HIP 110526 |
19.21 |
| 2026-05-30 00:00 |
22:21:57.89 |
+32:28:45.1 |
HIP 110526 |
19.23 |
| 2026-05-30 12:00 |
22:21:57.83 |
+32:29:15.7 |
HIP 110526 |
19.28 |
| 2026-05-31 00:00 |
22:21:57.74 |
+32:29:46.1 |
HIP 110526 |
19.35 |
| 2026-05-31 12:00 |
22:21:57.62 |
+32:30:16.4 |
HIP 110526 |
19.44 |
| 2026-06-01 00:00 |
22:21:57.47 |
+32:30:46.6 |
HIP 110526 |
19.55 |
| 2026-06-01 12:00 |
22:21:57.29 |
+32:31:16.6 |
HIP 110526 |
19.67 |
| 2026-06-02 00:00 |
22:21:57.08 |
+32:31:46.6 |
HIP 110526 |
19.81 |