C/2015 P3 (SWAN)
| Parameter |
Value |
| Designation |
C/2015 P3 (SWAN) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2015-07-27T19:07:02.274240Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:13Z |
| Obs used |
132 |
| NEO |
- |
| M1 |
16.300 |
| K1 |
10.250 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2015-08-17.0000000 |
| e |
0.99710074 |
| q (au) |
0.715220 |
| a (au) |
246.691015 |
| i (deg) |
58.183707 |
| Ω (om, deg) |
88.145306 |
| ω (w, deg) |
132.872099 |
| M (ma, deg) |
0.005139 |
Magnitude
Scatter + Global Linear
$$
M_a = (16.714 + 5.525\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
16.714 |
| n |
5.525 |
| gf |
0.999 |
| 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 |
03:24:48.79 |
-34:11:24.5 |
HIP 16014 |
29.87 |
| 2026-02-03 12:00 |
03:24:48.05 |
-34:10:29.4 |
HIP 16014 |
29.22 |
| 2026-02-04 00:00 |
03:24:47.36 |
-34:09:34.3 |
HIP 16014 |
28.57 |
| 2026-02-04 12:00 |
03:24:46.72 |
-34:08:39.0 |
HIP 16014 |
27.93 |
| 2026-02-05 00:00 |
03:24:46.13 |
-34:07:43.5 |
HIP 16014 |
27.30 |
| 2026-02-05 12:00 |
03:24:45.58 |
-34:06:48.0 |
HIP 16014 |
26.68 |
| 2026-02-06 00:00 |
03:24:45.08 |
-34:05:52.3 |
HIP 16014 |
26.07 |
| 2026-02-06 12:00 |
03:24:44.63 |
-34:04:56.6 |
HIP 16014 |
25.47 |
| 2026-02-07 00:00 |
03:24:44.22 |
-34:04:00.7 |
HIP 16014 |
24.89 |
| 2026-02-07 12:00 |
03:24:43.86 |
-34:03:04.7 |
HIP 16014 |
24.31 |
| 2026-02-08 00:00 |
03:24:43.54 |
-34:02:08.6 |
HIP 16014 |
23.76 |
| 2026-02-08 12:00 |
03:24:43.28 |
-34:01:12.4 |
HIP 16014 |
23.21 |
| 2026-02-09 00:00 |
03:24:43.06 |
-34:00:16.1 |
HIP 16014 |
22.69 |
| 2026-02-09 12:00 |
03:24:42.88 |
-33:59:19.7 |
HIP 16014 |
22.18 |
| 2026-02-10 00:00 |
03:24:42.76 |
-33:58:23.2 |
HIP 16014 |
21.69 |
| 2026-02-10 12:00 |
03:24:42.68 |
-33:57:26.7 |
HIP 16014 |
21.23 |
| 2026-02-11 00:00 |
03:24:42.64 |
-33:56:30.1 |
HIP 16014 |
20.79 |
| 2026-02-11 12:00 |
03:24:42.65 |
-33:55:33.4 |
HIP 16014 |
20.37 |
| 2026-02-12 00:00 |
03:24:42.71 |
-33:54:36.6 |
HIP 16014 |
19.98 |
| 2026-02-12 12:00 |
03:24:42.82 |
-33:53:39.8 |
HIP 16014 |
19.62 |
| 2026-02-13 00:00 |
03:24:42.97 |
-33:52:42.9 |
HIP 16014 |
19.28 |
| 2026-02-13 12:00 |
03:24:43.17 |
-33:51:45.9 |
HIP 16014 |
18.98 |
| 2026-02-14 00:00 |
03:24:43.42 |
-33:50:48.9 |
HIP 16014 |
18.72 |
| 2026-02-14 12:00 |
03:24:43.71 |
-33:49:51.8 |
HIP 16014 |
18.49 |
| 2026-02-15 00:00 |
03:24:44.04 |
-33:48:54.7 |
HIP 16014 |
18.29 |
| 2026-02-15 12:00 |
03:24:44.43 |
-33:47:57.6 |
HIP 16014 |
18.14 |
| 2026-02-16 00:00 |
03:24:44.86 |
-33:47:00.4 |
HIP 16014 |
18.02 |
| 2026-02-16 12:00 |
03:24:45.33 |
-33:46:03.2 |
HIP 16014 |
17.95 |
| 2026-02-17 00:00 |
03:24:45.85 |
-33:45:06.0 |
HIP 16014 |
17.92 |
| 2026-02-17 12:00 |
03:24:46.42 |
-33:44:08.7 |
HIP 16014 |
17.93 |
| 2026-02-18 00:00 |
03:24:47.03 |
-33:43:11.5 |
HIP 16014 |
17.98 |
| 2026-02-18 12:00 |
03:24:47.69 |
-33:42:14.2 |
HIP 16014 |
18.07 |
| 2026-02-19 00:00 |
03:24:48.39 |
-33:41:16.9 |
HIP 16014 |
18.21 |
| 2026-02-19 12:00 |
03:24:49.14 |
-33:40:19.6 |
HIP 16014 |
18.38 |
| 2026-02-20 00:00 |
03:24:49.94 |
-33:39:22.3 |
HIP 16014 |
18.60 |
| 2026-02-20 12:00 |
03:24:50.78 |
-33:38:25.0 |
HIP 16014 |
18.85 |
| 2026-02-21 00:00 |
03:24:51.66 |
-33:37:27.7 |
HIP 16014 |
19.15 |
| 2026-02-21 12:00 |
03:24:52.59 |
-33:36:30.4 |
HIP 16014 |
19.47 |
| 2026-02-22 00:00 |
03:24:53.56 |
-33:35:33.2 |
HIP 16014 |
19.84 |
| 2026-02-22 12:00 |
03:24:54.58 |
-33:34:35.9 |
HIP 16014 |
20.23 |
| 2026-02-23 00:00 |
03:24:55.64 |
-33:33:38.7 |
HIP 16014 |
20.66 |
| 2026-02-23 12:00 |
03:24:56.75 |
-33:32:41.5 |
HIP 16014 |
21.12 |
| 2026-02-24 00:00 |
03:24:57.90 |
-33:31:44.4 |
HIP 16014 |
21.61 |