| 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) |
| 2026-06-01 00:00 |
03:38:12.84 |
+65:42:02.9 |
HIP 17036 |
6.11 |
| 2026-06-01 12:00 |
03:38:19.13 |
+65:42:16.1 |
HIP 17036 |
5.63 |
| 2026-06-02 00:00 |
03:38:25.41 |
+65:42:29.5 |
HIP 17036 |
5.19 |
| 2026-06-02 12:00 |
03:38:31.68 |
+65:42:43.1 |
HIP 17036 |
4.81 |
| 2026-06-03 00:00 |
03:38:37.94 |
+65:42:57.0 |
HIP 17036 |
4.51 |
| 2026-06-03 12:00 |
03:38:44.18 |
+65:43:11.1 |
HIP 17036 |
4.30 |
| 2026-06-04 00:00 |
03:38:50.41 |
+65:43:25.4 |
HIP 17036 |
4.19 |
| 2026-06-04 12:00 |
03:38:56.62 |
+65:43:39.9 |
HIP 17036 |
4.21 |
| 2026-06-05 00:00 |
03:39:02.82 |
+65:43:54.7 |
HIP 17036 |
4.33 |
| 2026-06-05 12:00 |
03:39:09.00 |
+65:44:09.7 |
HIP 17036 |
4.56 |
| 2026-06-06 00:00 |
03:39:15.17 |
+65:44:24.9 |
HIP 17036 |
4.88 |
| 2026-06-06 12:00 |
03:39:21.32 |
+65:44:40.3 |
HIP 17036 |
5.27 |
| 2026-06-07 00:00 |
03:39:27.46 |
+65:44:56.0 |
HIP 17036 |
5.72 |
| 2026-06-07 12:00 |
03:39:33.58 |
+65:45:11.8 |
HIP 17036 |
6.21 |
| 2026-06-08 00:00 |
03:39:39.68 |
+65:45:27.9 |
HIP 17036 |
6.74 |
| 2026-06-08 12:00 |
03:39:45.76 |
+65:45:44.2 |
HIP 17036 |
7.30 |
| 2026-06-09 00:00 |
03:39:51.82 |
+65:46:00.7 |
HIP 17036 |
7.88 |
| 2026-06-09 12:00 |
03:39:57.87 |
+65:46:17.5 |
HIP 17036 |
8.47 |
| 2026-06-10 00:00 |
03:40:03.90 |
+65:46:34.4 |
HIP 17036 |
9.08 |
| 2026-06-10 12:00 |
03:40:09.91 |
+65:46:51.6 |
HIP 17036 |
9.70 |
| 2026-06-11 00:00 |
03:40:15.90 |
+65:47:08.9 |
HIP 17036 |
10.33 |
| 2026-06-11 12:00 |
03:40:21.86 |
+65:47:26.5 |
HIP 17036 |
10.96 |
| 2026-06-12 00:00 |
03:40:27.81 |
+65:47:44.3 |
HIP 17036 |
11.61 |
| 2026-06-12 12:00 |
03:40:33.74 |
+65:48:02.3 |
HIP 17036 |
12.25 |
| 2026-06-13 00:00 |
03:40:39.64 |
+65:48:20.5 |
HIP 17036 |
12.90 |
| 2026-06-13 12:00 |
03:40:45.53 |
+65:48:38.9 |
HIP 17036 |
13.55 |
| 2026-06-14 00:00 |
03:40:51.39 |
+65:48:57.5 |
HIP 17036 |
14.21 |
| 2026-06-14 12:00 |
03:40:57.23 |
+65:49:16.4 |
HIP 17036 |
14.87 |
| 2026-06-15 00:00 |
03:41:03.04 |
+65:49:35.4 |
HIP 17036 |
15.53 |
| 2026-06-15 12:00 |
03:41:08.83 |
+65:49:54.6 |
HIP 17036 |
16.19 |
| 2026-06-16 00:00 |
03:41:14.60 |
+65:50:14.0 |
HIP 17036 |
16.85 |
| 2026-06-16 12:00 |
03:41:20.34 |
+65:50:33.7 |
HIP 17273 |
16.91 |
| 2026-06-17 00:00 |
03:41:26.06 |
+65:50:53.5 |
HIP 17273 |
16.46 |
| 2026-06-17 12:00 |
03:41:31.76 |
+65:51:13.5 |
HIP 17273 |
16.03 |
| 2026-06-18 00:00 |
03:41:37.42 |
+65:51:33.7 |
HIP 17273 |
15.62 |
| 2026-06-18 12:00 |
03:41:43.06 |
+65:51:54.1 |
HIP 17273 |
15.22 |
| 2026-06-19 00:00 |
03:41:48.68 |
+65:52:14.7 |
HIP 17273 |
14.83 |
| 2026-06-19 12:00 |
03:41:54.26 |
+65:52:35.5 |
HIP 17273 |
14.47 |
| 2026-06-20 00:00 |
03:41:59.82 |
+65:52:56.5 |
HIP 17273 |
14.12 |
| 2026-06-20 12:00 |
03:42:05.36 |
+65:53:17.7 |
HIP 17273 |
13.79 |
| 2026-06-21 00:00 |
03:42:10.86 |
+65:53:39.0 |
HIP 17273 |
13.48 |
| 2026-06-21 12:00 |
03:42:16.33 |
+65:54:00.6 |
HIP 17273 |
13.20 |
| 2026-06-22 00:00 |
03:42:21.78 |
+65:54:22.3 |
HIP 17273 |
12.94 |