P/2005 T4 (SWAN)
| 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) |
| 2026-02-03 00:00 |
10:18:52.12 |
-06:35:58.0 |
HIP 50450 |
15.76 |
| 2026-02-03 12:00 |
10:18:44.45 |
-06:35:29.6 |
HIP 50450 |
14.06 |
| 2026-02-04 00:00 |
10:18:36.76 |
-06:35:00.8 |
HIP 50450 |
12.43 |
| 2026-02-04 12:00 |
10:18:29.03 |
-06:34:31.6 |
HIP 50450 |
10.90 |
| 2026-02-05 00:00 |
10:18:21.29 |
-06:34:01.9 |
HIP 50450 |
9.54 |
| 2026-02-05 12:00 |
10:18:13.52 |
-06:33:31.8 |
HIP 50450 |
8.41 |
| 2026-02-06 00:00 |
10:18:05.73 |
-06:33:01.3 |
HIP 50450 |
7.64 |
| 2026-02-06 12:00 |
10:17:57.91 |
-06:32:30.3 |
HIP 50450 |
7.35 |
| 2026-02-07 00:00 |
10:17:50.08 |
-06:31:59.0 |
HIP 50450 |
7.59 |
| 2026-02-07 12:00 |
10:17:42.22 |
-06:31:27.2 |
HIP 50450 |
8.32 |
| 2026-02-08 00:00 |
10:17:34.35 |
-06:30:55.0 |
HIP 50450 |
9.44 |
| 2026-02-08 12:00 |
10:17:26.45 |
-06:30:22.4 |
HIP 50450 |
10.83 |
| 2026-02-09 00:00 |
10:17:18.53 |
-06:29:49.4 |
HIP 50450 |
12.40 |
| 2026-02-09 12:00 |
10:17:10.60 |
-06:29:15.9 |
HIP 50450 |
14.09 |
| 2026-02-10 00:00 |
10:17:02.65 |
-06:28:42.1 |
HIP 50450 |
15.87 |
| 2026-02-10 12:00 |
10:16:54.68 |
-06:28:07.9 |
HIP 50450 |
17.72 |
| 2026-02-11 00:00 |
10:16:46.69 |
-06:27:33.2 |
HIP 50450 |
19.61 |
| 2026-02-11 12:00 |
10:16:38.69 |
-06:26:58.2 |
HIP 50450 |
21.53 |
| 2026-02-12 00:00 |
10:16:30.68 |
-06:26:22.8 |
HIP 50220 |
20.68 |
| 2026-02-12 12:00 |
10:16:22.65 |
-06:25:47.0 |
HIP 50220 |
18.66 |
| 2026-02-13 00:00 |
10:16:14.60 |
-06:25:10.8 |
HIP 50220 |
16.66 |
| 2026-02-13 12:00 |
10:16:06.55 |
-06:24:34.2 |
HIP 50220 |
14.69 |
| 2026-02-14 00:00 |
10:15:58.48 |
-06:23:57.2 |
HIP 50220 |
12.74 |
| 2026-02-14 12:00 |
10:15:50.40 |
-06:23:19.9 |
HIP 50220 |
10.85 |
| 2026-02-15 00:00 |
10:15:42.31 |
-06:22:42.1 |
HIP 50220 |
9.06 |
| 2026-02-15 12:00 |
10:15:34.21 |
-06:22:04.0 |
HIP 50220 |
7.42 |
| 2026-02-16 00:00 |
10:15:26.10 |
-06:21:25.6 |
HIP 50220 |
6.10 |
| 2026-02-16 12:00 |
10:15:17.98 |
-06:20:46.7 |
HIP 50220 |
5.31 |
| 2026-02-17 00:00 |
10:15:09.86 |
-06:20:07.5 |
HIP 50220 |
5.32 |
| 2026-02-17 12:00 |
10:15:01.73 |
-06:19:28.0 |
HIP 50220 |
6.12 |
| 2026-02-18 00:00 |
10:14:53.59 |
-06:18:48.1 |
HIP 50220 |
7.46 |
| 2026-02-18 12:00 |
10:14:45.44 |
-06:18:07.8 |
HIP 50220 |
9.12 |
| 2026-02-19 00:00 |
10:14:37.29 |
-06:17:27.2 |
HIP 50220 |
10.94 |
| 2026-02-19 12:00 |
10:14:29.14 |
-06:16:46.3 |
HIP 50220 |
12.87 |
| 2026-02-20 00:00 |
10:14:20.98 |
-06:16:05.0 |
HIP 50220 |
14.86 |
| 2026-02-20 12:00 |
10:14:12.83 |
-06:15:23.4 |
HIP 50220 |
16.89 |
| 2026-02-21 00:00 |
10:14:04.67 |
-06:14:41.4 |
HIP 50220 |
18.95 |
| 2026-02-21 12:00 |
10:13:56.50 |
-06:13:59.1 |
HIP 50220 |
21.03 |
| 2026-02-22 00:00 |
10:13:48.34 |
-06:13:16.5 |
HIP 50220 |
23.12 |
| 2026-02-22 12:00 |
10:13:40.18 |
-06:12:33.6 |
HIP 49961 |
24.58 |
| 2026-02-23 00:00 |
10:13:32.02 |
-06:11:50.4 |
HIP 49961 |
22.56 |
| 2026-02-23 12:00 |
10:13:23.86 |
-06:11:06.8 |
HIP 49961 |
20.55 |
| 2026-02-24 00:00 |
10:13:15.71 |
-06:10:23.0 |
HIP 49961 |
18.59 |