C/2006 E1 (McNaught)
| Parameter |
Value |
| Designation |
C/2006 E1 (McNaught) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2007-01-06T09:04:34.311360Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:56Z |
| Obs used |
143 |
| NEO |
- |
| M1 |
10.500 |
| K1 |
4.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2006-09-30.0000000 |
| e |
1.00112179 |
| q (au) |
6.040609 |
| a (au) |
-5384.803014 |
| i (deg) |
83.194197 |
| Ω (om, deg) |
95.035389 |
| ω (w, deg) |
232.766977 |
| M (ma, deg) |
-0.000245 |
Magnitude
Scatter + Global Linear
$$
M_a = (1.757 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
1.757 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
1.000 |
| 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) |
| 2026-02-03 00:00 |
06:20:10.19 |
+27:09:39.0 |
HIP 30101 |
13.51 |
| 2026-02-03 12:00 |
06:20:07.22 |
+27:09:43.3 |
HIP 30101 |
13.39 |
| 2026-02-04 00:00 |
06:20:04.26 |
+27:09:47.5 |
HIP 30101 |
13.31 |
| 2026-02-04 12:00 |
06:20:01.33 |
+27:09:51.7 |
HIP 30101 |
13.26 |
| 2026-02-05 00:00 |
06:19:58.43 |
+27:09:55.8 |
HIP 30101 |
13.24 |
| 2026-02-05 12:00 |
06:19:55.55 |
+27:10:00.0 |
HIP 30101 |
13.25 |
| 2026-02-06 00:00 |
06:19:52.69 |
+27:10:04.0 |
HIP 30101 |
13.30 |
| 2026-02-06 12:00 |
06:19:49.86 |
+27:10:08.0 |
HIP 30101 |
13.37 |
| 2026-02-07 00:00 |
06:19:47.05 |
+27:10:12.0 |
HIP 30101 |
13.47 |
| 2026-02-07 12:00 |
06:19:44.26 |
+27:10:16.0 |
HIP 30101 |
13.60 |
| 2026-02-08 00:00 |
06:19:41.50 |
+27:10:19.9 |
HIP 30101 |
13.75 |
| 2026-02-08 12:00 |
06:19:38.76 |
+27:10:23.8 |
HIP 30101 |
13.93 |
| 2026-02-09 00:00 |
06:19:36.05 |
+27:10:27.6 |
HIP 30101 |
14.13 |
| 2026-02-09 12:00 |
06:19:33.37 |
+27:10:31.4 |
HIP 30101 |
14.35 |
| 2026-02-10 00:00 |
06:19:30.71 |
+27:10:35.2 |
HIP 30101 |
14.59 |
| 2026-02-10 12:00 |
06:19:28.07 |
+27:10:38.9 |
HIP 30101 |
14.85 |
| 2026-02-11 00:00 |
06:19:25.46 |
+27:10:42.6 |
HIP 29955 |
14.51 |
| 2026-02-11 12:00 |
06:19:22.88 |
+27:10:46.3 |
HIP 29955 |
13.93 |
| 2026-02-12 00:00 |
06:19:20.33 |
+27:10:49.9 |
HIP 29955 |
13.36 |
| 2026-02-12 12:00 |
06:19:17.80 |
+27:10:53.5 |
HIP 29955 |
12.79 |
| 2026-02-13 00:00 |
06:19:15.30 |
+27:10:57.0 |
HIP 29955 |
12.24 |
| 2026-02-13 12:00 |
06:19:12.82 |
+27:11:00.5 |
HIP 29955 |
11.68 |
| 2026-02-14 00:00 |
06:19:10.37 |
+27:11:04.0 |
HIP 29955 |
11.14 |
| 2026-02-14 12:00 |
06:19:07.95 |
+27:11:07.5 |
HIP 29955 |
10.59 |
| 2026-02-15 00:00 |
06:19:05.56 |
+27:11:10.9 |
HIP 29955 |
10.06 |
| 2026-02-15 12:00 |
06:19:03.19 |
+27:11:14.3 |
HIP 29955 |
9.53 |
| 2026-02-16 00:00 |
06:19:00.86 |
+27:11:17.6 |
HIP 29955 |
9.01 |
| 2026-02-16 12:00 |
06:18:58.55 |
+27:11:20.9 |
HIP 29955 |
8.49 |
| 2026-02-17 00:00 |
06:18:56.27 |
+27:11:24.2 |
HIP 29955 |
7.98 |
| 2026-02-17 12:00 |
06:18:54.01 |
+27:11:27.4 |
HIP 29955 |
7.48 |
| 2026-02-18 00:00 |
06:18:51.79 |
+27:11:30.6 |
HIP 29955 |
6.98 |
| 2026-02-18 12:00 |
06:18:49.60 |
+27:11:33.8 |
HIP 29955 |
6.49 |
| 2026-02-19 00:00 |
06:18:47.43 |
+27:11:36.9 |
HIP 29955 |
6.01 |
| 2026-02-19 12:00 |
06:18:45.29 |
+27:11:40.0 |
HIP 29955 |
5.53 |
| 2026-02-20 00:00 |
06:18:43.19 |
+27:11:43.1 |
HIP 29955 |
5.06 |
| 2026-02-20 12:00 |
06:18:41.11 |
+27:11:46.1 |
HIP 29955 |
4.60 |
| 2026-02-21 00:00 |
06:18:39.06 |
+27:11:49.2 |
HIP 29955 |
4.14 |
| 2026-02-21 12:00 |
06:18:37.04 |
+27:11:52.1 |
HIP 29955 |
3.69 |
| 2026-02-22 00:00 |
06:18:35.05 |
+27:11:55.1 |
HIP 29955 |
3.25 |
| 2026-02-22 12:00 |
06:18:33.09 |
+27:11:58.0 |
HIP 29955 |
2.81 |
| 2026-02-23 00:00 |
06:18:31.17 |
+27:12:00.9 |
HIP 29955 |
2.39 |
| 2026-02-23 12:00 |
06:18:29.27 |
+27:12:03.7 |
HIP 29955 |
1.97 |
| 2026-02-24 00:00 |
06:18:27.40 |
+27:12:06.5 |
HIP 29955 |
1.56 |