| 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) |
| 2026-03-26 00:00 |
10:05:36.38 |
-05:19:54.0 |
HIP 49465 |
7.18 |
| 2026-03-26 12:00 |
10:05:29.62 |
-05:18:59.8 |
HIP 49465 |
8.99 |
| 2026-03-27 00:00 |
10:05:22.91 |
-05:18:05.6 |
HIP 49465 |
10.82 |
| 2026-03-27 12:00 |
10:05:16.24 |
-05:17:11.4 |
HIP 49465 |
12.66 |
| 2026-03-28 00:00 |
10:05:09.61 |
-05:16:17.1 |
HIP 49465 |
14.51 |
| 2026-03-28 12:00 |
10:05:03.03 |
-05:15:22.9 |
HIP 49465 |
16.36 |
| 2026-03-29 00:00 |
10:04:56.49 |
-05:14:28.6 |
HIP 49465 |
18.20 |
| 2026-03-29 12:00 |
10:04:49.99 |
-05:13:34.4 |
HIP 49465 |
20.04 |
| 2026-03-30 00:00 |
10:04:43.54 |
-05:12:40.1 |
HIP 49465 |
21.87 |
| 2026-03-30 12:00 |
10:04:37.13 |
-05:11:45.9 |
HIP 49465 |
23.70 |
| 2026-03-31 00:00 |
10:04:30.77 |
-05:10:51.7 |
HIP 49465 |
25.51 |
| 2026-03-31 12:00 |
10:04:24.45 |
-05:09:57.5 |
HIP 49465 |
27.32 |
| 2026-04-01 00:00 |
10:04:18.18 |
-05:09:03.3 |
HIP 49465 |
29.12 |
| 2026-04-01 12:00 |
10:04:11.95 |
-05:08:09.2 |
HIP 49465 |
30.91 |
| 2026-04-02 00:00 |
10:04:05.77 |
-05:07:15.0 |
HIP 49465 |
32.69 |
| 2026-04-02 12:00 |
10:03:59.64 |
-05:06:21.0 |
HIP 49465 |
34.46 |
| 2026-04-03 00:00 |
10:03:53.56 |
-05:05:26.9 |
HIP 49231 |
34.68 |
| 2026-04-03 12:00 |
10:03:47.52 |
-05:04:33.0 |
HIP 49231 |
34.92 |
| 2026-04-04 00:00 |
10:03:41.54 |
-05:03:39.0 |
HIP 49231 |
35.26 |
| 2026-04-04 12:00 |
10:03:35.60 |
-05:02:45.2 |
HIP 49231 |
35.68 |
| 2026-04-05 00:00 |
10:03:29.71 |
-05:01:51.3 |
HIP 49231 |
36.18 |
| 2026-04-05 12:00 |
10:03:23.87 |
-05:00:57.6 |
HIP 49231 |
36.75 |
| 2026-04-06 00:00 |
10:03:18.08 |
-05:00:03.9 |
HIP 49231 |
37.40 |
| 2026-04-06 12:00 |
10:03:12.34 |
-04:59:10.3 |
HIP 49231 |
38.11 |
| 2026-04-07 00:00 |
10:03:06.65 |
-04:58:16.7 |
HIP 49231 |
38.88 |
| 2026-04-07 12:00 |
10:03:01.01 |
-04:57:23.3 |
HIP 49231 |
39.70 |
| 2026-04-08 00:00 |
10:02:55.42 |
-04:56:29.9 |
HIP 49231 |
40.58 |
| 2026-04-08 12:00 |
10:02:49.89 |
-04:55:36.6 |
HIP 49231 |
41.49 |
| 2026-04-09 00:00 |
10:02:44.41 |
-04:54:43.4 |
HIP 49021 |
40.44 |
| 2026-04-09 12:00 |
10:02:38.98 |
-04:53:50.3 |
HIP 49021 |
39.25 |
| 2026-04-10 00:00 |
10:02:33.60 |
-04:52:57.4 |
HIP 49021 |
38.10 |
| 2026-04-10 12:00 |
10:02:28.27 |
-04:52:04.5 |
HIP 49021 |
37.00 |
| 2026-04-11 00:00 |
10:02:23.00 |
-04:51:11.7 |
HIP 49021 |
35.95 |
| 2026-04-11 12:00 |
10:02:17.79 |
-04:50:19.1 |
HIP 49021 |
34.95 |
| 2026-04-12 00:00 |
10:02:12.62 |
-04:49:26.5 |
HIP 49021 |
34.01 |
| 2026-04-12 12:00 |
10:02:07.52 |
-04:48:34.1 |
HIP 49021 |
33.13 |
| 2026-04-13 00:00 |
10:02:02.46 |
-04:47:41.8 |
HIP 49021 |
32.30 |
| 2026-04-13 12:00 |
10:01:57.47 |
-04:46:49.7 |
HIP 49021 |
31.54 |
| 2026-04-14 00:00 |
10:01:52.52 |
-04:45:57.7 |
HIP 49021 |
30.85 |
| 2026-04-14 12:00 |
10:01:47.64 |
-04:45:05.8 |
HIP 49021 |
30.23 |
| 2026-04-15 00:00 |
10:01:42.81 |
-04:44:14.1 |
HIP 49021 |
29.67 |
| 2026-04-15 12:00 |
10:01:38.03 |
-04:43:22.5 |
HIP 49021 |
29.20 |
| 2026-04-16 00:00 |
10:01:33.32 |
-04:42:31.1 |
HIP 49072 |
28.24 |