| 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) |
| 2026-06-01 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 |
| 2026-06-02 12:00 |
22:21:56.84 |
+32:32:16.3 |
HIP 110526 |
19.97 |
| 2026-06-03 00:00 |
22:21:56.57 |
+32:32:46.0 |
HIP 110526 |
20.15 |
| 2026-06-03 12:00 |
22:21:56.27 |
+32:33:15.5 |
HIP 110526 |
20.34 |
| 2026-06-04 00:00 |
22:21:55.94 |
+32:33:44.8 |
HIP 110526 |
20.55 |
| 2026-06-04 12:00 |
22:21:55.58 |
+32:34:14.0 |
HIP 110526 |
20.77 |
| 2026-06-05 00:00 |
22:21:55.18 |
+32:34:43.1 |
HIP 110526 |
21.00 |
| 2026-06-05 12:00 |
22:21:54.76 |
+32:35:12.0 |
HIP 110526 |
21.25 |
| 2026-06-06 00:00 |
22:21:54.31 |
+32:35:40.7 |
HIP 110526 |
21.52 |
| 2026-06-06 12:00 |
22:21:53.83 |
+32:36:09.3 |
HIP 110526 |
21.79 |
| 2026-06-07 00:00 |
22:21:53.32 |
+32:36:37.8 |
HIP 110526 |
22.08 |
| 2026-06-07 12:00 |
22:21:52.78 |
+32:37:06.1 |
HIP 110526 |
22.38 |
| 2026-06-08 00:00 |
22:21:52.21 |
+32:37:34.2 |
HIP 110526 |
22.69 |
| 2026-06-08 12:00 |
22:21:51.61 |
+32:38:02.2 |
HIP 110526 |
23.01 |
| 2026-06-09 00:00 |
22:21:50.98 |
+32:38:30.0 |
HIP 110526 |
23.34 |
| 2026-06-09 12:00 |
22:21:50.31 |
+32:38:57.6 |
HIP 110526 |
23.68 |
| 2026-06-10 00:00 |
22:21:49.62 |
+32:39:25.1 |
HIP 110526 |
24.03 |
| 2026-06-10 12:00 |
22:21:48.90 |
+32:39:52.4 |
HIP 110267 |
24.01 |
| 2026-06-11 00:00 |
22:21:48.15 |
+32:40:19.5 |
HIP 110267 |
23.66 |
| 2026-06-11 12:00 |
22:21:47.37 |
+32:40:46.4 |
HIP 110267 |
23.32 |
| 2026-06-12 00:00 |
22:21:46.57 |
+32:41:13.2 |
HIP 110267 |
22.97 |
| 2026-06-12 12:00 |
22:21:45.73 |
+32:41:39.8 |
HIP 110267 |
22.63 |
| 2026-06-13 00:00 |
22:21:44.86 |
+32:42:06.2 |
HIP 110267 |
22.29 |
| 2026-06-13 12:00 |
22:21:43.96 |
+32:42:32.4 |
HIP 110267 |
21.94 |
| 2026-06-14 00:00 |
22:21:43.03 |
+32:42:58.4 |
HIP 110267 |
21.60 |
| 2026-06-14 12:00 |
22:21:42.08 |
+32:43:24.3 |
HIP 110267 |
21.26 |
| 2026-06-15 00:00 |
22:21:41.09 |
+32:43:49.9 |
HIP 110267 |
20.92 |
| 2026-06-15 12:00 |
22:21:40.07 |
+32:44:15.4 |
HIP 110267 |
20.58 |
| 2026-06-16 00:00 |
22:21:39.03 |
+32:44:40.6 |
HIP 110267 |
20.24 |
| 2026-06-16 12:00 |
22:21:37.96 |
+32:45:05.7 |
HIP 110267 |
19.90 |
| 2026-06-17 00:00 |
22:21:36.85 |
+32:45:30.5 |
HIP 110267 |
19.56 |
| 2026-06-17 12:00 |
22:21:35.72 |
+32:45:55.2 |
HIP 110267 |
19.22 |
| 2026-06-18 00:00 |
22:21:34.56 |
+32:46:19.6 |
HIP 110267 |
18.88 |
| 2026-06-18 12:00 |
22:21:33.37 |
+32:46:43.9 |
HIP 110267 |
18.55 |
| 2026-06-19 00:00 |
22:21:32.16 |
+32:47:07.9 |
HIP 110267 |
18.21 |
| 2026-06-19 12:00 |
22:21:30.91 |
+32:47:31.7 |
HIP 110267 |
17.88 |
| 2026-06-20 00:00 |
22:21:29.64 |
+32:47:55.3 |
HIP 110267 |
17.55 |
| 2026-06-20 12:00 |
22:21:28.33 |
+32:48:18.7 |
HIP 110267 |
17.22 |
| 2026-06-21 00:00 |
22:21:27.00 |
+32:48:41.9 |
HIP 110267 |
16.89 |
| 2026-06-21 12:00 |
22:21:25.65 |
+32:49:04.9 |
HIP 110267 |
16.56 |
| 2026-06-22 00:00 |
22:21:24.26 |
+32:49:27.6 |
HIP 110267 |
16.23 |