C/2006 A1 (Pojmanski)
| Parameter |
Value |
| Designation |
C/2006 A1 (Pojmanski) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2006-02-22T04:21:22.887360Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:56Z |
| Obs used |
600 |
| NEO |
- |
| M1 |
10.500 |
| K1 |
16.500 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2006-03-24.0000000 |
| e |
0.99976626 |
| q (au) |
0.555396 |
| a (au) |
2376.082997 |
| i (deg) |
92.736122 |
| Ω (om, deg) |
211.343233 |
| ω (w, deg) |
351.187789 |
| M (ma, deg) |
0.000254 |
Magnitude
Scatter + Global Linear
$$
M_a = (9.584 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
9.584 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.500 |
| 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
Residuals (Piecewise)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| Start (UTC) |
End (UTC) |
a |
b |
| 2006-01-04 |
2006-01-23 |
+11.6706 |
+1.827 |
| 2006-01-23 |
2006-02-21 |
-6.7238 |
-1.283 |
| 2006-02-22 |
2006-04-21 |
-9.0090 |
-1.162 |
| 2006-04-21 |
2006-08-10 |
-2.0594 |
-1.254 |
| 2006-08-10 |
2006-12-12 |
-12.5337 |
+3.029 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
01:20:06.91 |
+32:17:34.0 |
HIP 6209 |
6.54 |
| 2026-02-03 12:00 |
01:20:08.16 |
+32:17:22.2 |
HIP 6209 |
6.81 |
| 2026-02-04 00:00 |
01:20:09.43 |
+32:17:10.5 |
HIP 6209 |
7.09 |
| 2026-02-04 12:00 |
01:20:10.73 |
+32:16:59.1 |
HIP 6209 |
7.38 |
| 2026-02-05 00:00 |
01:20:12.05 |
+32:16:47.8 |
HIP 6209 |
7.68 |
| 2026-02-05 12:00 |
01:20:13.40 |
+32:16:36.7 |
HIP 6209 |
7.99 |
| 2026-02-06 00:00 |
01:20:14.77 |
+32:16:25.8 |
HIP 6209 |
8.30 |
| 2026-02-06 12:00 |
01:20:16.17 |
+32:16:15.1 |
HIP 6209 |
8.62 |
| 2026-02-07 00:00 |
01:20:17.59 |
+32:16:04.6 |
HIP 6209 |
8.95 |
| 2026-02-07 12:00 |
01:20:19.03 |
+32:15:54.2 |
HIP 6209 |
9.28 |
| 2026-02-08 00:00 |
01:20:20.51 |
+32:15:44.1 |
HIP 6209 |
9.62 |
| 2026-02-08 12:00 |
01:20:22.00 |
+32:15:34.1 |
HIP 6209 |
9.96 |
| 2026-02-09 00:00 |
01:20:23.52 |
+32:15:24.3 |
HIP 6209 |
10.31 |
| 2026-02-09 12:00 |
01:20:25.06 |
+32:15:14.8 |
HIP 6209 |
10.67 |
| 2026-02-10 00:00 |
01:20:26.63 |
+32:15:05.4 |
HIP 6209 |
11.02 |
| 2026-02-10 12:00 |
01:20:28.22 |
+32:14:56.2 |
HIP 6209 |
11.39 |
| 2026-02-11 00:00 |
01:20:29.83 |
+32:14:47.2 |
HIP 6209 |
11.75 |
| 2026-02-11 12:00 |
01:20:31.47 |
+32:14:38.4 |
HIP 6209 |
12.13 |
| 2026-02-12 00:00 |
01:20:33.13 |
+32:14:29.8 |
HIP 6209 |
12.50 |
| 2026-02-12 12:00 |
01:20:34.81 |
+32:14:21.3 |
HIP 6209 |
12.88 |
| 2026-02-13 00:00 |
01:20:36.52 |
+32:14:13.1 |
HIP 6209 |
13.27 |
| 2026-02-13 12:00 |
01:20:38.24 |
+32:14:05.1 |
HIP 6209 |
13.65 |
| 2026-02-14 00:00 |
01:20:40.00 |
+32:13:57.2 |
HIP 6209 |
14.05 |
| 2026-02-14 12:00 |
01:20:41.77 |
+32:13:49.6 |
HIP 6209 |
14.44 |
| 2026-02-15 00:00 |
01:20:43.57 |
+32:13:42.2 |
HIP 6209 |
14.84 |
| 2026-02-15 12:00 |
01:20:45.39 |
+32:13:34.9 |
HIP 6209 |
15.24 |
| 2026-02-16 00:00 |
01:20:47.23 |
+32:13:27.9 |
HIP 6209 |
15.65 |
| 2026-02-16 12:00 |
01:20:49.09 |
+32:13:21.0 |
HIP 6209 |
16.06 |
| 2026-02-17 00:00 |
01:20:50.98 |
+32:13:14.3 |
HIP 6209 |
16.48 |
| 2026-02-17 12:00 |
01:20:52.88 |
+32:13:07.9 |
HIP 6209 |
16.89 |
| 2026-02-18 00:00 |
01:20:54.81 |
+32:13:01.6 |
HIP 6209 |
17.31 |
| 2026-02-18 12:00 |
01:20:56.76 |
+32:12:55.5 |
HIP 6209 |
17.74 |
| 2026-02-19 00:00 |
01:20:58.73 |
+32:12:49.7 |
HIP 6209 |
18.17 |
| 2026-02-19 12:00 |
01:21:00.72 |
+32:12:44.0 |
HIP 6209 |
18.60 |
| 2026-02-20 00:00 |
01:21:02.73 |
+32:12:38.5 |
HIP 6209 |
19.03 |
| 2026-02-20 12:00 |
01:21:04.77 |
+32:12:33.2 |
HIP 6209 |
19.47 |
| 2026-02-21 00:00 |
01:21:06.82 |
+32:12:28.2 |
HIP 6209 |
19.91 |
| 2026-02-21 12:00 |
01:21:08.89 |
+32:12:23.3 |
HIP 6209 |
20.35 |
| 2026-02-22 00:00 |
01:21:10.99 |
+32:12:18.6 |
HIP 6209 |
20.80 |
| 2026-02-22 12:00 |
01:21:13.10 |
+32:12:14.1 |
HIP 6209 |
21.25 |
| 2026-02-23 00:00 |
01:21:15.23 |
+32:12:09.8 |
HIP 6209 |
21.71 |
| 2026-02-23 12:00 |
01:21:17.39 |
+32:12:05.7 |
HIP 6209 |
22.17 |
| 2026-02-24 00:00 |
01:21:19.56 |
+32:12:01.8 |
HIP 6209 |
22.63 |