| Parameter |
Value |
| Designation |
P/2005 T4 (SWAN) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2005-10-10T12:54:01.762560Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:53Z |
| Obs used |
31 |
| NEO |
Yes |
| M1 |
15.400 |
| K1 |
10.000 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2005-10-24.0000000 |
| e |
0.93035203 |
| q (au) |
0.649400 |
| a (au) |
9.324030 |
| i (deg) |
160.036223 |
| Ω (om, deg) |
25.422511 |
| ω (w, deg) |
41.444068 |
| M (ma, deg) |
0.466041 |
Magnitude
Scatter + Global Linear
$$
M_a = (14.853 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
14.853 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
0.800 |
| 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) |
| 2026-05-12 00:00 |
09:58:50.72 |
-04:03:01.5 |
HIP 48897 |
25.56 |
| 2026-05-12 12:00 |
09:58:49.22 |
-04:02:23.2 |
HIP 48897 |
24.86 |
| 2026-05-13 00:00 |
09:58:47.79 |
-04:01:45.3 |
HIP 48897 |
24.17 |
| 2026-05-13 12:00 |
09:58:46.42 |
-04:01:07.6 |
HIP 48897 |
23.49 |
| 2026-05-14 00:00 |
09:58:45.11 |
-04:00:30.3 |
HIP 48897 |
22.82 |
| 2026-05-14 12:00 |
09:58:43.87 |
-03:59:53.4 |
HIP 48897 |
22.16 |
| 2026-05-15 00:00 |
09:58:42.68 |
-03:59:16.7 |
HIP 48897 |
21.51 |
| 2026-05-15 12:00 |
09:58:41.56 |
-03:58:40.5 |
HIP 48897 |
20.87 |
| 2026-05-16 00:00 |
09:58:40.50 |
-03:58:04.5 |
HIP 48897 |
20.24 |
| 2026-05-16 12:00 |
09:58:39.51 |
-03:57:28.9 |
HIP 48897 |
19.61 |
| 2026-05-17 00:00 |
09:58:38.57 |
-03:56:53.6 |
HIP 48897 |
19.00 |
| 2026-05-17 12:00 |
09:58:37.70 |
-03:56:18.7 |
HIP 48897 |
18.40 |
| 2026-05-18 00:00 |
09:58:36.89 |
-03:55:44.1 |
HIP 48897 |
17.80 |
| 2026-05-18 12:00 |
09:58:36.14 |
-03:55:09.9 |
HIP 48897 |
17.22 |
| 2026-05-19 00:00 |
09:58:35.45 |
-03:54:36.0 |
HIP 48897 |
16.64 |
| 2026-05-19 12:00 |
09:58:34.83 |
-03:54:02.5 |
HIP 48897 |
16.07 |
| 2026-05-20 00:00 |
09:58:34.26 |
-03:53:29.3 |
HIP 48897 |
15.50 |
| 2026-05-20 12:00 |
09:58:33.76 |
-03:52:56.5 |
HIP 48897 |
14.95 |
| 2026-05-21 00:00 |
09:58:33.32 |
-03:52:24.1 |
HIP 48897 |
14.40 |
| 2026-05-21 12:00 |
09:58:32.94 |
-03:51:52.0 |
HIP 48897 |
13.86 |
| 2026-05-22 00:00 |
09:58:32.62 |
-03:51:20.3 |
HIP 48897 |
13.33 |
| 2026-05-22 12:00 |
09:58:32.36 |
-03:50:48.9 |
HIP 48897 |
12.80 |
| 2026-05-23 00:00 |
09:58:32.16 |
-03:50:17.9 |
HIP 48897 |
12.28 |
| 2026-05-23 12:00 |
09:58:32.02 |
-03:49:47.2 |
HIP 48897 |
11.77 |
| 2026-05-24 00:00 |
09:58:31.94 |
-03:49:17.0 |
HIP 48897 |
11.27 |
| 2026-05-24 12:00 |
09:58:31.92 |
-03:48:47.1 |
HIP 48897 |
10.77 |
| 2026-05-25 00:00 |
09:58:31.96 |
-03:48:17.5 |
HIP 48897 |
10.28 |
| 2026-05-25 12:00 |
09:58:32.06 |
-03:47:48.4 |
HIP 48897 |
9.80 |
| 2026-05-26 00:00 |
09:58:32.22 |
-03:47:19.6 |
HIP 48897 |
9.32 |
| 2026-05-26 12:00 |
09:58:32.44 |
-03:46:51.1 |
HIP 48897 |
8.85 |
| 2026-05-27 00:00 |
09:58:32.72 |
-03:46:23.1 |
HIP 48897 |
8.39 |
| 2026-05-27 12:00 |
09:58:33.06 |
-03:45:55.4 |
HIP 48897 |
7.95 |
| 2026-05-28 00:00 |
09:58:33.45 |
-03:45:28.1 |
HIP 48897 |
7.51 |
| 2026-05-28 12:00 |
09:58:33.91 |
-03:45:01.2 |
HIP 48897 |
7.08 |
| 2026-05-29 00:00 |
09:58:34.42 |
-03:44:34.6 |
HIP 48897 |
6.67 |
| 2026-05-29 12:00 |
09:58:34.99 |
-03:44:08.5 |
HIP 48897 |
6.27 |
| 2026-05-30 00:00 |
09:58:35.62 |
-03:43:42.7 |
HIP 48897 |
5.89 |
| 2026-05-30 12:00 |
09:58:36.31 |
-03:43:17.2 |
HIP 48897 |
5.54 |
| 2026-05-31 00:00 |
09:58:37.05 |
-03:42:52.2 |
HIP 48897 |
5.21 |
| 2026-05-31 12:00 |
09:58:37.85 |
-03:42:27.5 |
HIP 48897 |
4.92 |
| 2026-06-01 00:00 |
09:58:38.71 |
-03:42:03.3 |
HIP 48897 |
4.66 |
| 2026-06-01 12:00 |
09:58:39.63 |
-03:41:39.4 |
HIP 48897 |
4.45 |
| 2026-06-02 00:00 |
09:58:40.60 |
-03:41:15.9 |
HIP 48897 |
4.29 |