| 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
$$
M_a = (9.583 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
9.583 |
| 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 |
+1.828 |
| 2006-01-23 |
2006-02-21 |
-6.7238 |
-1.282 |
| 2006-02-22 |
2006-04-26 |
-8.0722 |
-1.039 |
| 2006-04-26 |
2006-12-12 |
-5.5681 |
-0.447 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-05-12 00:00 |
01:28:44.01 |
+32:36:01.0 |
HIP 7020 |
32.91 |
| 2026-05-12 12:00 |
01:28:46.79 |
+32:36:20.1 |
HIP 7020 |
32.77 |
| 2026-05-13 00:00 |
01:28:49.56 |
+32:36:39.3 |
HIP 7020 |
32.64 |
| 2026-05-13 12:00 |
01:28:52.32 |
+32:36:58.5 |
HIP 7020 |
32.53 |
| 2026-05-14 00:00 |
01:28:55.06 |
+32:37:17.8 |
HIP 7020 |
32.44 |
| 2026-05-14 12:00 |
01:28:57.80 |
+32:37:37.2 |
HIP 7020 |
32.36 |
| 2026-05-15 00:00 |
01:29:00.52 |
+32:37:56.6 |
HIP 7020 |
32.29 |
| 2026-05-15 12:00 |
01:29:03.23 |
+32:38:16.1 |
HIP 7020 |
32.24 |
| 2026-05-16 00:00 |
01:29:05.92 |
+32:38:35.6 |
HIP 7020 |
32.21 |
| 2026-05-16 12:00 |
01:29:08.60 |
+32:38:55.2 |
HIP 7020 |
32.20 |
| 2026-05-17 00:00 |
01:29:11.27 |
+32:39:14.8 |
HIP 7012 |
31.68 |
| 2026-05-17 12:00 |
01:29:13.93 |
+32:39:34.5 |
HIP 7012 |
31.14 |
| 2026-05-18 00:00 |
01:29:16.57 |
+32:39:54.3 |
HIP 7012 |
30.61 |
| 2026-05-18 12:00 |
01:29:19.20 |
+32:40:14.1 |
HIP 7012 |
30.08 |
| 2026-05-19 00:00 |
01:29:21.82 |
+32:40:34.0 |
HIP 7012 |
29.56 |
| 2026-05-19 12:00 |
01:29:24.42 |
+32:40:53.9 |
HIP 7012 |
29.04 |
| 2026-05-20 00:00 |
01:29:27.01 |
+32:41:13.8 |
HIP 7012 |
28.53 |
| 2026-05-20 12:00 |
01:29:29.58 |
+32:41:33.8 |
HIP 7012 |
28.02 |
| 2026-05-21 00:00 |
01:29:32.13 |
+32:41:53.9 |
HIP 7012 |
27.52 |
| 2026-05-21 12:00 |
01:29:34.68 |
+32:42:13.9 |
HIP 7012 |
27.03 |
| 2026-05-22 00:00 |
01:29:37.21 |
+32:42:34.1 |
HIP 7012 |
26.54 |
| 2026-05-22 12:00 |
01:29:39.72 |
+32:42:54.2 |
HIP 7012 |
26.05 |
| 2026-05-23 00:00 |
01:29:42.22 |
+32:43:14.4 |
HIP 7012 |
25.58 |
| 2026-05-23 12:00 |
01:29:44.70 |
+32:43:34.7 |
HIP 7012 |
25.11 |
| 2026-05-24 00:00 |
01:29:47.16 |
+32:43:55.0 |
HIP 7012 |
24.64 |
| 2026-05-24 12:00 |
01:29:49.61 |
+32:44:15.3 |
HIP 7012 |
24.19 |
| 2026-05-25 00:00 |
01:29:52.05 |
+32:44:35.6 |
HIP 7012 |
23.74 |
| 2026-05-25 12:00 |
01:29:54.47 |
+32:44:56.0 |
HIP 7012 |
23.30 |
| 2026-05-26 00:00 |
01:29:56.87 |
+32:45:16.4 |
HIP 7012 |
22.87 |
| 2026-05-26 12:00 |
01:29:59.25 |
+32:45:36.8 |
HIP 7012 |
22.44 |
| 2026-05-27 00:00 |
01:30:01.62 |
+32:45:57.3 |
HIP 7012 |
22.03 |
| 2026-05-27 12:00 |
01:30:03.98 |
+32:46:17.8 |
HIP 7012 |
21.62 |
| 2026-05-28 00:00 |
01:30:06.31 |
+32:46:38.3 |
HIP 7012 |
21.22 |
| 2026-05-28 12:00 |
01:30:08.63 |
+32:46:58.8 |
HIP 7012 |
20.84 |
| 2026-05-29 00:00 |
01:30:10.93 |
+32:47:19.4 |
HIP 7012 |
20.46 |
| 2026-05-29 12:00 |
01:30:13.22 |
+32:47:39.9 |
HIP 7012 |
20.09 |
| 2026-05-30 00:00 |
01:30:15.48 |
+32:48:00.5 |
HIP 7012 |
19.73 |
| 2026-05-30 12:00 |
01:30:17.73 |
+32:48:21.2 |
HIP 7012 |
19.38 |
| 2026-05-31 00:00 |
01:30:19.97 |
+32:48:41.8 |
HIP 7012 |
19.05 |
| 2026-05-31 12:00 |
01:30:22.18 |
+32:49:02.4 |
HIP 7012 |
18.72 |
| 2026-06-01 00:00 |
01:30:24.38 |
+32:49:23.1 |
HIP 7012 |
18.41 |
| 2026-06-01 12:00 |
01:30:26.55 |
+32:49:43.8 |
HIP 7012 |
18.11 |
| 2026-06-02 00:00 |
01:30:28.71 |
+32:50:04.5 |
HIP 7012 |
17.82 |