C/2002 O6 (SWAN)
| Parameter |
Value |
| Designation |
C/2002 O6 (SWAN) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2002-09-09T10:47:45.683520Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:18Z |
| Obs used |
215 |
| NEO |
- |
| M1 |
13.000 |
| K1 |
17.000 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2002-08-11.0000000 |
| e |
0.99857622 |
| q (au) |
0.494648 |
| a (au) |
347.419672 |
| i (deg) |
58.623930 |
| Ω (om, deg) |
330.951734 |
| ω (w, deg) |
78.749213 |
| M (ma, deg) |
359.995518 |
Magnitude
Scatter + Global Linear
$$
M_a = (12.479 + 5.037\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
12.479 |
| n |
5.037 |
| gf |
1.000 |
| gb |
-1.000 |
| 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 |
| 2002-08-01 |
2002-08-11 |
+7.7471 |
-0.268 |
| 2002-08-11 |
2002-09-06 |
+2.9828 |
+0.626 |
| 2002-09-10 |
2002-09-28 |
-25.0626 |
-6.959 |
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 |
11:24:10.66 |
-55:25:44.1 |
HIP 55773 |
13.13 |
| 2026-02-03 12:00 |
11:24:07.18 |
-55:25:59.1 |
HIP 55773 |
13.67 |
| 2026-02-04 00:00 |
11:24:03.67 |
-55:26:13.8 |
HIP 55773 |
14.21 |
| 2026-02-04 12:00 |
11:24:00.14 |
-55:26:28.1 |
HIP 55773 |
14.75 |
| 2026-02-05 00:00 |
11:23:56.59 |
-55:26:42.2 |
HIP 55773 |
15.29 |
| 2026-02-05 12:00 |
11:23:53.01 |
-55:26:56.0 |
HIP 55773 |
15.84 |
| 2026-02-06 00:00 |
11:23:49.41 |
-55:27:09.5 |
HIP 55773 |
16.39 |
| 2026-02-06 12:00 |
11:23:45.79 |
-55:27:22.7 |
HIP 55773 |
16.94 |
| 2026-02-07 00:00 |
11:23:42.15 |
-55:27:35.6 |
HIP 55773 |
17.49 |
| 2026-02-07 12:00 |
11:23:38.48 |
-55:27:48.2 |
HIP 55773 |
18.05 |
| 2026-02-08 00:00 |
11:23:34.80 |
-55:28:00.5 |
HIP 55773 |
18.61 |
| 2026-02-08 12:00 |
11:23:31.09 |
-55:28:12.5 |
HIP 55773 |
19.16 |
| 2026-02-09 00:00 |
11:23:27.36 |
-55:28:24.2 |
HIP 55773 |
19.73 |
| 2026-02-09 12:00 |
11:23:23.62 |
-55:28:35.6 |
HIP 55773 |
20.29 |
| 2026-02-10 00:00 |
11:23:19.85 |
-55:28:46.7 |
HIP 55773 |
20.85 |
| 2026-02-10 12:00 |
11:23:16.06 |
-55:28:57.5 |
HIP 55773 |
21.42 |
| 2026-02-11 00:00 |
11:23:12.25 |
-55:29:08.0 |
HIP 55422 |
21.21 |
| 2026-02-11 12:00 |
11:23:08.43 |
-55:29:18.2 |
HIP 55422 |
20.80 |
| 2026-02-12 00:00 |
11:23:04.58 |
-55:29:28.1 |
HIP 55422 |
20.40 |
| 2026-02-12 12:00 |
11:23:00.72 |
-55:29:37.6 |
HIP 55422 |
20.00 |
| 2026-02-13 00:00 |
11:22:56.83 |
-55:29:46.9 |
HIP 55422 |
19.60 |
| 2026-02-13 12:00 |
11:22:52.93 |
-55:29:55.8 |
HIP 55422 |
19.20 |
| 2026-02-14 00:00 |
11:22:49.01 |
-55:30:04.4 |
HIP 55422 |
18.81 |
| 2026-02-14 12:00 |
11:22:45.08 |
-55:30:12.7 |
HIP 55422 |
18.43 |
| 2026-02-15 00:00 |
11:22:41.13 |
-55:30:20.7 |
HIP 55422 |
18.05 |
| 2026-02-15 12:00 |
11:22:37.16 |
-55:30:28.4 |
HIP 55422 |
17.67 |
| 2026-02-16 00:00 |
11:22:33.17 |
-55:30:35.8 |
HIP 55422 |
17.30 |
| 2026-02-16 12:00 |
11:22:29.17 |
-55:30:42.8 |
HIP 55422 |
16.94 |
| 2026-02-17 00:00 |
11:22:25.16 |
-55:30:49.6 |
HIP 55422 |
16.59 |
| 2026-02-17 12:00 |
11:22:21.13 |
-55:30:56.0 |
HIP 55422 |
16.24 |
| 2026-02-18 00:00 |
11:22:17.08 |
-55:31:02.1 |
HIP 55422 |
15.90 |
| 2026-02-18 12:00 |
11:22:13.02 |
-55:31:07.9 |
HIP 55422 |
15.57 |
| 2026-02-19 00:00 |
11:22:08.94 |
-55:31:13.4 |
HIP 55422 |
15.25 |
| 2026-02-19 12:00 |
11:22:04.86 |
-55:31:18.5 |
HIP 55422 |
14.94 |
| 2026-02-20 00:00 |
11:22:00.75 |
-55:31:23.3 |
HIP 55422 |
14.65 |
| 2026-02-20 12:00 |
11:21:56.64 |
-55:31:27.9 |
HIP 55422 |
14.36 |
| 2026-02-21 00:00 |
11:21:52.51 |
-55:31:32.0 |
HIP 55422 |
14.09 |
| 2026-02-21 12:00 |
11:21:48.37 |
-55:31:35.9 |
HIP 55422 |
13.83 |
| 2026-02-22 00:00 |
11:21:44.22 |
-55:31:39.5 |
HIP 55422 |
13.59 |
| 2026-02-22 12:00 |
11:21:40.06 |
-55:31:42.7 |
HIP 55422 |
13.37 |
| 2026-02-23 00:00 |
11:21:35.89 |
-55:31:45.6 |
HIP 55422 |
13.16 |
| 2026-02-23 12:00 |
11:21:31.70 |
-55:31:48.2 |
HIP 55422 |
12.97 |
| 2026-02-24 00:00 |
11:21:27.51 |
-55:31:50.5 |
HIP 55422 |
12.80 |