| 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) |
| 2026-07-29 00:00 |
10:05:38.15 |
-03:39:27.5 |
HIP 49412 |
10.60 |
| 2026-07-29 12:00 |
10:05:43.79 |
-03:39:48.0 |
HIP 49412 |
11.76 |
| 2026-07-30 00:00 |
10:05:49.45 |
-03:40:08.9 |
HIP 49412 |
12.99 |
| 2026-07-30 12:00 |
10:05:55.13 |
-03:40:30.0 |
HIP 49412 |
14.27 |
| 2026-07-31 00:00 |
10:06:00.83 |
-03:40:51.5 |
HIP 49412 |
15.58 |
| 2026-07-31 12:00 |
10:06:06.55 |
-03:41:13.4 |
HIP 49412 |
16.93 |
| 2026-08-01 00:00 |
10:06:12.29 |
-03:41:35.5 |
HIP 49412 |
18.31 |
| 2026-08-01 12:00 |
10:06:18.04 |
-03:41:58.0 |
HIP 49412 |
19.70 |
| 2026-08-02 00:00 |
10:06:23.82 |
-03:42:20.8 |
HIP 49412 |
21.12 |
| 2026-08-02 12:00 |
10:06:29.61 |
-03:42:44.0 |
HIP 49412 |
22.55 |
| 2026-08-03 00:00 |
10:06:35.43 |
-03:43:07.4 |
HIP 49412 |
24.00 |
| 2026-08-03 12:00 |
10:06:41.25 |
-03:43:31.2 |
HIP 49412 |
25.45 |
| 2026-08-04 00:00 |
10:06:47.10 |
-03:43:55.3 |
HIP 49412 |
26.92 |
| 2026-08-04 12:00 |
10:06:52.96 |
-03:44:19.7 |
HIP 49545 |
27.33 |
| 2026-08-05 00:00 |
10:06:58.84 |
-03:44:44.4 |
HIP 49545 |
27.70 |
| 2026-08-05 12:00 |
10:07:04.73 |
-03:45:09.4 |
HIP 49682 |
27.19 |
| 2026-08-06 00:00 |
10:07:10.64 |
-03:45:34.8 |
HIP 49682 |
26.30 |
| 2026-08-06 12:00 |
10:07:16.57 |
-03:46:00.4 |
HIP 49682 |
25.47 |
| 2026-08-07 00:00 |
10:07:22.51 |
-03:46:26.4 |
HIP 49682 |
24.72 |
| 2026-08-07 12:00 |
10:07:28.46 |
-03:46:52.7 |
HIP 49682 |
24.04 |
| 2026-08-08 00:00 |
10:07:34.43 |
-03:47:19.3 |
HIP 49682 |
23.45 |
| 2026-08-08 12:00 |
10:07:40.42 |
-03:47:46.2 |
HIP 49682 |
22.94 |
| 2026-08-09 00:00 |
10:07:46.41 |
-03:48:13.3 |
HIP 49682 |
22.54 |
| 2026-08-09 12:00 |
10:07:52.42 |
-03:48:40.8 |
HIP 49682 |
22.25 |
| 2026-08-10 00:00 |
10:07:58.44 |
-03:49:08.6 |
HIP 49684 |
21.42 |
| 2026-08-10 12:00 |
10:08:04.47 |
-03:49:36.7 |
HIP 49684 |
20.43 |
| 2026-08-11 00:00 |
10:08:10.52 |
-03:50:05.1 |
HIP 49684 |
19.51 |
| 2026-08-11 12:00 |
10:08:16.57 |
-03:50:33.8 |
HIP 49684 |
18.67 |
| 2026-08-12 00:00 |
10:08:22.64 |
-03:51:02.8 |
HIP 49762 |
17.48 |
| 2026-08-12 12:00 |
10:08:28.72 |
-03:51:32.1 |
HIP 49762 |
15.89 |
| 2026-08-13 00:00 |
10:08:34.80 |
-03:52:01.6 |
HIP 49762 |
14.30 |
| 2026-08-13 12:00 |
10:08:40.90 |
-03:52:31.5 |
HIP 49762 |
12.70 |
| 2026-08-14 00:00 |
10:08:47.00 |
-03:53:01.6 |
HIP 49762 |
11.10 |
| 2026-08-14 12:00 |
10:08:53.12 |
-03:53:32.0 |
HIP 49762 |
9.49 |
| 2026-08-15 00:00 |
10:08:59.24 |
-03:54:02.7 |
HIP 49762 |
7.88 |
| 2026-08-15 12:00 |
10:09:05.37 |
-03:54:33.7 |
HIP 49762 |
6.27 |
| 2026-08-16 00:00 |
10:09:11.50 |
-03:55:04.9 |
HIP 49762 |
4.65 |
| 2026-08-16 12:00 |
10:09:17.65 |
-03:55:36.4 |
HIP 49762 |
3.04 |
| 2026-08-17 00:00 |
10:09:23.80 |
-03:56:08.2 |
HIP 49762 |
1.43 |
| 2026-08-17 12:00 |
10:09:29.95 |
-03:56:40.3 |
HIP 49762 |
0.36 |
| 2026-08-18 00:00 |
10:09:36.12 |
-03:57:12.6 |
HIP 49762 |
1.87 |
| 2026-08-18 12:00 |
10:09:42.28 |
-03:57:45.2 |
HIP 49762 |
3.49 |
| 2026-08-19 00:00 |
10:09:48.45 |
-03:58:18.1 |
HIP 49762 |
5.12 |