| 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) |
| 2026-09-20 00:00 |
10:16:15.38 |
-04:40:48.5 |
HIP 50285 |
25.20 |
| 2026-09-20 12:00 |
10:16:21.01 |
-04:41:33.7 |
HIP 50285 |
24.69 |
| 2026-09-21 00:00 |
10:16:26.62 |
-04:42:19.0 |
HIP 50285 |
24.28 |
| 2026-09-21 12:00 |
10:16:32.20 |
-04:43:04.4 |
HIP 50285 |
23.96 |
| 2026-09-22 00:00 |
10:16:37.77 |
-04:43:49.9 |
HIP 50285 |
23.74 |
| 2026-09-22 12:00 |
10:16:43.31 |
-04:44:35.5 |
HIP 50285 |
23.62 |
| 2026-09-23 00:00 |
10:16:48.82 |
-04:45:21.1 |
HIP 50285 |
23.60 |
| 2026-09-23 12:00 |
10:16:54.31 |
-04:46:06.9 |
HIP 50285 |
23.68 |
| 2026-09-24 00:00 |
10:16:59.78 |
-04:46:52.8 |
HIP 50285 |
23.85 |
| 2026-09-24 12:00 |
10:17:05.23 |
-04:47:38.7 |
HIP 50285 |
24.12 |
| 2026-09-25 00:00 |
10:17:10.64 |
-04:48:24.8 |
HIP 50285 |
24.49 |
| 2026-09-25 12:00 |
10:17:16.04 |
-04:49:10.9 |
HIP 50285 |
24.94 |
| 2026-09-26 00:00 |
10:17:21.40 |
-04:49:57.1 |
HIP 50285 |
25.46 |
| 2026-09-26 12:00 |
10:17:26.75 |
-04:50:43.4 |
HIP 50285 |
26.07 |
| 2026-09-27 00:00 |
10:17:32.06 |
-04:51:29.7 |
HIP 50285 |
26.74 |
| 2026-09-27 12:00 |
10:17:37.35 |
-04:52:16.1 |
HIP 50285 |
27.47 |
| 2026-09-28 00:00 |
10:17:42.61 |
-04:53:02.6 |
HIP 50285 |
28.27 |
| 2026-09-28 12:00 |
10:17:47.84 |
-04:53:49.2 |
HIP 50552 |
28.89 |
| 2026-09-29 00:00 |
10:17:53.05 |
-04:54:35.8 |
HIP 50552 |
27.39 |
| 2026-09-29 12:00 |
10:17:58.23 |
-04:55:22.5 |
HIP 50552 |
25.89 |
| 2026-09-30 00:00 |
10:18:03.38 |
-04:56:09.2 |
HIP 50552 |
24.40 |
| 2026-09-30 12:00 |
10:18:08.50 |
-04:56:56.0 |
HIP 50552 |
22.92 |
| 2026-10-01 00:00 |
10:18:13.59 |
-04:57:42.9 |
HIP 50552 |
21.44 |
| 2026-10-01 12:00 |
10:18:18.65 |
-04:58:29.8 |
HIP 50552 |
19.97 |
| 2026-10-02 00:00 |
10:18:23.68 |
-04:59:16.8 |
HIP 50552 |
18.51 |
| 2026-10-02 12:00 |
10:18:28.68 |
-05:00:03.8 |
HIP 50552 |
17.06 |
| 2026-10-03 00:00 |
10:18:33.65 |
-05:00:50.8 |
HIP 50552 |
15.63 |
| 2026-10-03 12:00 |
10:18:38.58 |
-05:01:37.9 |
HIP 50552 |
14.20 |
| 2026-10-04 00:00 |
10:18:43.49 |
-05:02:25.0 |
HIP 50552 |
12.79 |
| 2026-10-04 12:00 |
10:18:48.36 |
-05:03:12.2 |
HIP 50552 |
11.40 |
| 2026-10-05 00:00 |
10:18:53.20 |
-05:03:59.4 |
HIP 50552 |
10.04 |
| 2026-10-05 12:00 |
10:18:58.01 |
-05:04:46.6 |
HIP 50552 |
8.70 |
| 2026-10-06 00:00 |
10:19:02.78 |
-05:05:33.8 |
HIP 50552 |
7.41 |
| 2026-10-06 12:00 |
10:19:07.52 |
-05:06:21.1 |
HIP 50552 |
6.19 |
| 2026-10-07 00:00 |
10:19:12.23 |
-05:07:08.4 |
HIP 50552 |
5.08 |
| 2026-10-07 12:00 |
10:19:16.90 |
-05:07:55.7 |
HIP 50552 |
4.16 |
| 2026-10-08 00:00 |
10:19:21.53 |
-05:08:43.0 |
HIP 50552 |
3.58 |
| 2026-10-08 12:00 |
10:19:26.13 |
-05:09:30.3 |
HIP 50552 |
3.51 |
| 2026-10-09 00:00 |
10:19:30.69 |
-05:10:17.6 |
HIP 50554 |
3.57 |
| 2026-10-09 12:00 |
10:19:35.22 |
-05:11:05.0 |
HIP 50554 |
2.56 |
| 2026-10-10 00:00 |
10:19:39.71 |
-05:11:52.3 |
HIP 50554 |
2.03 |
| 2026-10-10 12:00 |
10:19:44.16 |
-05:12:39.6 |
HIP 50554 |
2.33 |
| 2026-10-11 00:00 |
10:19:48.58 |
-05:13:26.9 |
HIP 50554 |
3.22 |