| 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) |
| 2026-07-29 00:00 |
03:47:20.34 |
+66:27:54.4 |
HIP 17566 |
10.56 |
| 2026-07-29 12:00 |
03:47:22.64 |
+66:28:25.4 |
HIP 17566 |
10.57 |
| 2026-07-30 00:00 |
03:47:24.89 |
+66:28:56.6 |
HIP 17566 |
10.60 |
| 2026-07-30 12:00 |
03:47:27.08 |
+66:29:27.8 |
HIP 17566 |
10.65 |
| 2026-07-31 00:00 |
03:47:29.23 |
+66:29:59.0 |
HIP 17566 |
10.73 |
| 2026-07-31 12:00 |
03:47:31.31 |
+66:30:30.3 |
HIP 17566 |
10.83 |
| 2026-08-01 00:00 |
03:47:33.35 |
+66:31:01.6 |
HIP 17566 |
10.95 |
| 2026-08-01 12:00 |
03:47:35.33 |
+66:31:33.0 |
HIP 17566 |
11.10 |
| 2026-08-02 00:00 |
03:47:37.25 |
+66:32:04.4 |
HIP 17566 |
11.27 |
| 2026-08-02 12:00 |
03:47:39.12 |
+66:32:35.9 |
HIP 17566 |
11.45 |
| 2026-08-03 00:00 |
03:47:40.93 |
+66:33:07.4 |
HIP 17566 |
11.65 |
| 2026-08-03 12:00 |
03:47:42.69 |
+66:33:39.0 |
HIP 17566 |
11.87 |
| 2026-08-04 00:00 |
03:47:44.39 |
+66:34:10.5 |
HIP 17566 |
12.11 |
| 2026-08-04 12:00 |
03:47:46.03 |
+66:34:42.2 |
HIP 17566 |
12.36 |
| 2026-08-05 00:00 |
03:47:47.62 |
+66:35:13.8 |
HIP 17566 |
12.62 |
| 2026-08-05 12:00 |
03:47:49.15 |
+66:35:45.5 |
HIP 17566 |
12.90 |
| 2026-08-06 00:00 |
03:47:50.63 |
+66:36:17.2 |
HIP 17566 |
13.19 |
| 2026-08-06 12:00 |
03:47:52.04 |
+66:36:49.0 |
HIP 17566 |
13.49 |
| 2026-08-07 00:00 |
03:47:53.40 |
+66:37:20.8 |
HIP 17566 |
13.80 |
| 2026-08-07 12:00 |
03:47:54.70 |
+66:37:52.6 |
HIP 17566 |
14.11 |
| 2026-08-08 00:00 |
03:47:55.95 |
+66:38:24.4 |
HIP 17566 |
14.44 |
| 2026-08-08 12:00 |
03:47:57.13 |
+66:38:56.2 |
HIP 17566 |
14.77 |
| 2026-08-09 00:00 |
03:47:58.26 |
+66:39:28.1 |
HIP 17566 |
15.12 |
| 2026-08-09 12:00 |
03:47:59.33 |
+66:40:00.0 |
HIP 17566 |
15.46 |
| 2026-08-10 00:00 |
03:48:00.33 |
+66:40:31.8 |
HIP 17566 |
15.82 |
| 2026-08-10 12:00 |
03:48:01.28 |
+66:41:03.7 |
HIP 17566 |
16.18 |
| 2026-08-11 00:00 |
03:48:02.17 |
+66:41:35.6 |
HIP 17566 |
16.54 |
| 2026-08-11 12:00 |
03:48:03.00 |
+66:42:07.5 |
HIP 17566 |
16.91 |
| 2026-08-12 00:00 |
03:48:03.77 |
+66:42:39.4 |
HIP 17566 |
17.28 |
| 2026-08-12 12:00 |
03:48:04.48 |
+66:43:11.3 |
HIP 17566 |
17.66 |
| 2026-08-13 00:00 |
03:48:05.13 |
+66:43:43.2 |
HIP 17566 |
18.04 |
| 2026-08-13 12:00 |
03:48:05.72 |
+66:44:15.1 |
HIP 17566 |
18.42 |
| 2026-08-14 00:00 |
03:48:06.25 |
+66:44:47.0 |
HIP 17566 |
18.81 |
| 2026-08-14 12:00 |
03:48:06.71 |
+66:45:18.8 |
HIP 17566 |
19.20 |
| 2026-08-15 00:00 |
03:48:07.12 |
+66:45:50.7 |
HIP 17566 |
19.59 |
| 2026-08-15 12:00 |
03:48:07.46 |
+66:46:22.6 |
HIP 17566 |
19.98 |
| 2026-08-16 00:00 |
03:48:07.75 |
+66:46:54.4 |
HIP 17566 |
20.37 |
| 2026-08-16 12:00 |
03:48:07.97 |
+66:47:26.2 |
HIP 17566 |
20.77 |
| 2026-08-17 00:00 |
03:48:08.13 |
+66:47:58.0 |
HIP 17566 |
21.17 |
| 2026-08-17 12:00 |
03:48:08.22 |
+66:48:29.8 |
HIP 17566 |
21.57 |
| 2026-08-18 00:00 |
03:48:08.26 |
+66:49:01.5 |
HIP 17566 |
21.97 |
| 2026-08-18 12:00 |
03:48:08.24 |
+66:49:33.2 |
HIP 17893 |
22.20 |
| 2026-08-19 00:00 |
03:48:08.15 |
+66:50:04.9 |
HIP 17893 |
21.71 |