| Parameter |
Value |
| Designation |
C/2006 B1 (McNaught) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2005-11-19T12:22:21.066240Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:56Z |
| Obs used |
184 |
| NEO |
- |
| M1 |
13.300 |
| K1 |
4.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2006-04-29.0000000 |
| e |
0.99776536 |
| q (au) |
2.997591 |
| a (au) |
1341.421761 |
| i (deg) |
134.281929 |
| Ω (om, deg) |
161.239384 |
| ω (w, deg) |
302.491743 |
| M (ma, deg) |
0.003220 |
Magnitude
Scatter + Global Linear
$$
M_a = (13.124 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
13.124 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.908 |
| k |
0.999 |
| 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) |
| 2026-09-25 00:00 |
03:45:06.67 |
+67:24:59.0 |
HIP 17585 |
13.89 |
| 2026-09-25 12:00 |
03:45:01.90 |
+67:25:21.7 |
HIP 17585 |
14.42 |
| 2026-09-26 00:00 |
03:44:57.07 |
+67:25:44.1 |
HIP 17585 |
14.94 |
| 2026-09-26 12:00 |
03:44:52.19 |
+67:26:06.4 |
HIP 17585 |
15.48 |
| 2026-09-27 00:00 |
03:44:47.25 |
+67:26:28.4 |
HIP 17585 |
16.02 |
| 2026-09-27 12:00 |
03:44:42.25 |
+67:26:50.2 |
HIP 17585 |
16.56 |
| 2026-09-28 00:00 |
03:44:37.20 |
+67:27:11.8 |
HIP 17585 |
17.10 |
| 2026-09-28 12:00 |
03:44:32.09 |
+67:27:33.1 |
HIP 17585 |
17.65 |
| 2026-09-29 00:00 |
03:44:26.92 |
+67:27:54.3 |
HIP 17585 |
18.20 |
| 2026-09-29 12:00 |
03:44:21.70 |
+67:28:15.2 |
HIP 17585 |
18.75 |
| 2026-09-30 00:00 |
03:44:16.42 |
+67:28:35.9 |
HIP 17585 |
19.31 |
| 2026-09-30 12:00 |
03:44:11.09 |
+67:28:56.3 |
HIP 17585 |
19.87 |
| 2026-10-01 00:00 |
03:44:05.71 |
+67:29:16.6 |
HIP 17585 |
20.43 |
| 2026-10-01 12:00 |
03:44:00.27 |
+67:29:36.6 |
HIP 17585 |
21.00 |
| 2026-10-02 00:00 |
03:43:54.77 |
+67:29:56.4 |
HIP 17585 |
21.56 |
| 2026-10-02 12:00 |
03:43:49.23 |
+67:30:15.9 |
HIP 17585 |
22.13 |
| 2026-10-03 00:00 |
03:43:43.62 |
+67:30:35.2 |
HIP 17585 |
22.71 |
| 2026-10-03 12:00 |
03:43:37.97 |
+67:30:54.2 |
HIP 17585 |
23.28 |
| 2026-10-04 00:00 |
03:43:32.26 |
+67:31:13.1 |
HIP 17062 |
23.45 |
| 2026-10-04 12:00 |
03:43:26.50 |
+67:31:31.6 |
HIP 17062 |
22.93 |
| 2026-10-05 00:00 |
03:43:20.69 |
+67:31:49.9 |
HIP 17062 |
22.41 |
| 2026-10-05 12:00 |
03:43:14.83 |
+67:32:08.0 |
HIP 17062 |
21.89 |
| 2026-10-06 00:00 |
03:43:08.91 |
+67:32:25.8 |
HIP 17062 |
21.37 |
| 2026-10-06 12:00 |
03:43:02.94 |
+67:32:43.4 |
HIP 17062 |
20.85 |
| 2026-10-07 00:00 |
03:42:56.93 |
+67:33:00.7 |
HIP 17062 |
20.33 |
| 2026-10-07 12:00 |
03:42:50.86 |
+67:33:17.8 |
HIP 17062 |
19.81 |
| 2026-10-08 00:00 |
03:42:44.74 |
+67:33:34.6 |
HIP 17062 |
19.30 |
| 2026-10-08 12:00 |
03:42:38.58 |
+67:33:51.1 |
HIP 17062 |
18.79 |
| 2026-10-09 00:00 |
03:42:32.36 |
+67:34:07.4 |
HIP 17062 |
18.28 |
| 2026-10-09 12:00 |
03:42:26.10 |
+67:34:23.4 |
HIP 17062 |
17.78 |
| 2026-10-10 00:00 |
03:42:19.79 |
+67:34:39.1 |
HIP 17062 |
17.28 |
| 2026-10-10 12:00 |
03:42:13.43 |
+67:34:54.6 |
HIP 17062 |
16.79 |
| 2026-10-11 00:00 |
03:42:07.02 |
+67:35:09.8 |
HIP 17062 |
16.30 |
| 2026-10-11 12:00 |
03:42:00.57 |
+67:35:24.7 |
HIP 17062 |
15.83 |
| 2026-10-12 00:00 |
03:41:54.07 |
+67:35:39.4 |
HIP 17062 |
15.35 |
| 2026-10-12 12:00 |
03:41:47.53 |
+67:35:53.7 |
HIP 17062 |
14.89 |
| 2026-10-13 00:00 |
03:41:40.94 |
+67:36:07.8 |
HIP 17062 |
14.44 |
| 2026-10-13 12:00 |
03:41:34.30 |
+67:36:21.7 |
HIP 17062 |
14.00 |
| 2026-10-14 00:00 |
03:41:27.63 |
+67:36:35.2 |
HIP 17062 |
13.58 |
| 2026-10-14 12:00 |
03:41:20.90 |
+67:36:48.4 |
HIP 17062 |
13.17 |
| 2026-10-15 00:00 |
03:41:14.14 |
+67:37:01.4 |
HIP 17062 |
12.77 |
| 2026-10-15 12:00 |
03:41:07.33 |
+67:37:14.1 |
HIP 17062 |
12.40 |
| 2026-10-16 00:00 |
03:41:00.49 |
+67:37:26.5 |
HIP 17062 |
12.04 |