| Parameter |
Value |
| Designation |
C/2004 V13 (SWAN) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2004-12-21T03:38:32.539200Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:45Z |
| Obs used |
25 |
| NEO |
- |
| M1 |
15.000 |
| K1 |
15.000 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2005-01-03.0000000 |
| e |
0.99999462 |
| q (au) |
0.180856 |
| a (au) |
33639.443095 |
| i (deg) |
34.809752 |
| Ω (om, deg) |
207.699525 |
| ω (w, deg) |
92.690799 |
| M (ma, deg) |
0.000002 |
Magnitude
Scatter + Global Linear
$$
M_a = (13.145 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
13.145 |
| n |
2.000 |
| gf |
0.800 |
| gb |
-1.000 |
| k |
0.800 |
| δ90 |
1.000 |
| 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 |
07:10:15.71 |
-11:53:33.3 |
HIP 34612 |
5.70 |
| 2026-06-01 12:00 |
07:10:17.93 |
-11:53:23.4 |
HIP 34612 |
5.75 |
| 2026-06-02 00:00 |
07:10:20.16 |
-11:53:13.7 |
HIP 34612 |
5.85 |
| 2026-06-02 12:00 |
07:10:22.41 |
-11:53:04.1 |
HIP 34612 |
6.02 |
| 2026-06-03 00:00 |
07:10:24.66 |
-11:52:54.7 |
HIP 34612 |
6.23 |
| 2026-06-03 12:00 |
07:10:26.93 |
-11:52:45.5 |
HIP 34612 |
6.50 |
| 2026-06-04 00:00 |
07:10:29.21 |
-11:52:36.5 |
HIP 34612 |
6.81 |
| 2026-06-04 12:00 |
07:10:31.51 |
-11:52:27.7 |
HIP 34612 |
7.15 |
| 2026-06-05 00:00 |
07:10:33.81 |
-11:52:19.0 |
HIP 34612 |
7.53 |
| 2026-06-05 12:00 |
07:10:36.13 |
-11:52:10.5 |
HIP 34612 |
7.93 |
| 2026-06-06 00:00 |
07:10:38.46 |
-11:52:02.2 |
HIP 34612 |
8.37 |
| 2026-06-06 12:00 |
07:10:40.80 |
-11:51:54.0 |
HIP 34612 |
8.82 |
| 2026-06-07 00:00 |
07:10:43.15 |
-11:51:46.1 |
HIP 34612 |
9.29 |
| 2026-06-07 12:00 |
07:10:45.51 |
-11:51:38.3 |
HIP 34612 |
9.78 |
| 2026-06-08 00:00 |
07:10:47.88 |
-11:51:30.7 |
HIP 34612 |
10.28 |
| 2026-06-08 12:00 |
07:10:50.26 |
-11:51:23.3 |
HIP 34612 |
10.80 |
| 2026-06-09 00:00 |
07:10:52.66 |
-11:51:16.1 |
HIP 34612 |
11.32 |
| 2026-06-09 12:00 |
07:10:55.06 |
-11:51:09.0 |
HIP 34612 |
11.86 |
| 2026-06-10 00:00 |
07:10:57.47 |
-11:51:02.2 |
HIP 34612 |
12.41 |
| 2026-06-10 12:00 |
07:10:59.90 |
-11:50:55.5 |
HIP 34710 |
12.34 |
| 2026-06-11 00:00 |
07:11:02.33 |
-11:50:49.0 |
HIP 34710 |
12.25 |
| 2026-06-11 12:00 |
07:11:04.77 |
-11:50:42.7 |
HIP 34710 |
12.18 |
| 2026-06-12 00:00 |
07:11:07.23 |
-11:50:36.6 |
HIP 34710 |
12.14 |
| 2026-06-12 12:00 |
07:11:09.69 |
-11:50:30.7 |
HIP 34710 |
12.12 |
| 2026-06-13 00:00 |
07:11:12.16 |
-11:50:24.9 |
HIP 34710 |
12.13 |
| 2026-06-13 12:00 |
07:11:14.64 |
-11:50:19.4 |
HIP 34710 |
12.17 |
| 2026-06-14 00:00 |
07:11:17.13 |
-11:50:14.0 |
HIP 34710 |
12.24 |
| 2026-06-14 12:00 |
07:11:19.63 |
-11:50:08.8 |
HIP 34710 |
12.33 |
| 2026-06-15 00:00 |
07:11:22.14 |
-11:50:03.8 |
HIP 34710 |
12.45 |
| 2026-06-15 12:00 |
07:11:24.65 |
-11:49:59.0 |
HIP 34710 |
12.60 |
| 2026-06-16 00:00 |
07:11:27.17 |
-11:49:54.4 |
HIP 34710 |
12.77 |
| 2026-06-16 12:00 |
07:11:29.70 |
-11:49:50.0 |
HIP 34710 |
12.97 |
| 2026-06-17 00:00 |
07:11:32.24 |
-11:49:45.7 |
HIP 34710 |
13.19 |
| 2026-06-17 12:00 |
07:11:34.79 |
-11:49:41.7 |
HIP 34710 |
13.44 |
| 2026-06-18 00:00 |
07:11:37.34 |
-11:49:37.8 |
HIP 34710 |
13.70 |
| 2026-06-18 12:00 |
07:11:39.90 |
-11:49:34.2 |
HIP 34710 |
13.99 |
| 2026-06-19 00:00 |
07:11:42.47 |
-11:49:30.7 |
HIP 34710 |
14.30 |
| 2026-06-19 12:00 |
07:11:45.04 |
-11:49:27.4 |
HIP 34710 |
14.63 |
| 2026-06-20 00:00 |
07:11:47.62 |
-11:49:24.3 |
HIP 34710 |
14.97 |
| 2026-06-20 12:00 |
07:11:50.21 |
-11:49:21.4 |
HIP 34710 |
15.33 |
| 2026-06-21 00:00 |
07:11:52.81 |
-11:49:18.7 |
HIP 34710 |
15.71 |
| 2026-06-21 12:00 |
07:11:55.40 |
-11:49:16.1 |
HIP 34710 |
16.10 |
| 2026-06-22 00:00 |
07:11:58.01 |
-11:49:13.8 |
HIP 34710 |
16.50 |