7P/Pons-Winnecke
| Parameter |
Value |
| Designation |
7P/Pons-Winnecke |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2015-01-30T12:39:41.261760Z |
| Orbit solution date (soln_date, UTC) |
2026-01-08T08:16:07Z |
| Obs used |
1686 |
| NEO |
Yes |
| M1 |
16.000 |
| K1 |
4.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2015-05-13.0000000 |
| e |
0.63757762 |
| q (au) |
1.239193 |
| a (au) |
3.419195 |
| i (deg) |
22.334568 |
| Ω (om, deg) |
93.415263 |
| ω (w, deg) |
172.505518 |
| M (ma, deg) |
15.974432 |
Magnitude
Scatter + Global Linear
$$
M_a = (H_0 + n\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
- |
| n |
- |
| gf |
- |
| gb |
- |
| k |
- |
| δ90 |
- |
| 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
Finding Chart
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
07:21:05.12 |
+32:04:29.1 |
HIP 35563 |
9.84 |
| 2026-02-03 12:00 |
07:20:40.75 |
+32:05:33.0 |
HIP 35563 |
4.61 |
| 2026-02-04 00:00 |
07:20:16.53 |
+32:06:35.7 |
HIP 35563 |
1.12 |
| 2026-02-04 12:00 |
07:19:52.48 |
+32:07:37.1 |
HIP 35563 |
5.97 |
| 2026-02-05 00:00 |
07:19:28.59 |
+32:08:37.3 |
HIP 35563 |
11.09 |
| 2026-02-05 12:00 |
07:19:04.86 |
+32:09:36.3 |
HIP 35563 |
16.20 |
| 2026-02-06 00:00 |
07:18:41.31 |
+32:10:33.9 |
HIP 35563 |
21.27 |
| 2026-02-06 12:00 |
07:18:17.94 |
+32:11:30.4 |
HIP 35272 |
19.44 |
| 2026-02-07 00:00 |
07:17:54.74 |
+32:12:25.6 |
HIP 35272 |
17.14 |
| 2026-02-07 12:00 |
07:17:31.72 |
+32:13:19.5 |
HIP 35272 |
16.11 |
| 2026-02-08 00:00 |
07:17:08.89 |
+32:14:12.3 |
HIP 35272 |
16.53 |
| 2026-02-08 12:00 |
07:16:46.26 |
+32:15:03.8 |
HIP 35272 |
18.28 |
| 2026-02-09 00:00 |
07:16:23.81 |
+32:15:54.0 |
HIP 35272 |
21.00 |
| 2026-02-09 12:00 |
07:16:01.56 |
+32:16:43.1 |
HIP 35272 |
24.34 |
| 2026-02-10 00:00 |
07:15:39.52 |
+32:17:30.9 |
HIP 35272 |
28.05 |
| 2026-02-10 12:00 |
07:15:17.68 |
+32:18:17.6 |
HIP 34920 |
24.52 |
| 2026-02-11 00:00 |
07:14:56.04 |
+32:19:03.0 |
HIP 34920 |
20.75 |
| 2026-02-11 12:00 |
07:14:34.62 |
+32:19:47.2 |
HIP 34920 |
17.42 |
| 2026-02-12 00:00 |
07:14:13.41 |
+32:20:30.3 |
HIP 34920 |
14.81 |
| 2026-02-12 12:00 |
07:13:52.42 |
+32:21:12.2 |
HIP 34920 |
13.28 |
| 2026-02-13 00:00 |
07:13:31.66 |
+32:21:52.8 |
HIP 34920 |
13.15 |
| 2026-02-13 12:00 |
07:13:11.11 |
+32:22:32.4 |
HIP 34920 |
14.43 |
| 2026-02-14 00:00 |
07:12:50.80 |
+32:23:10.7 |
HIP 34920 |
16.76 |
| 2026-02-14 12:00 |
07:12:30.72 |
+32:23:47.9 |
HIP 34920 |
19.73 |
| 2026-02-15 00:00 |
07:12:10.87 |
+32:24:24.0 |
HIP 34700 |
17.21 |
| 2026-02-15 12:00 |
07:11:51.25 |
+32:24:58.9 |
HIP 34700 |
14.18 |
| 2026-02-16 00:00 |
07:11:31.88 |
+32:25:32.6 |
HIP 34700 |
11.91 |
| 2026-02-16 12:00 |
07:11:12.75 |
+32:26:05.3 |
HIP 34700 |
10.82 |
| 2026-02-17 00:00 |
07:10:53.86 |
+32:26:36.9 |
HIP 34663 |
10.75 |
| 2026-02-17 12:00 |
07:10:35.22 |
+32:27:07.3 |
HIP 34663 |
10.14 |
| 2026-02-18 00:00 |
07:10:16.84 |
+32:27:36.6 |
HIP 34663 |
11.02 |
| 2026-02-18 12:00 |
07:09:58.70 |
+32:28:04.9 |
HIP 34663 |
13.03 |
| 2026-02-19 00:00 |
07:09:40.83 |
+32:28:32.1 |
HIP 34663 |
15.71 |
| 2026-02-19 12:00 |
07:09:23.21 |
+32:28:58.2 |
HIP 34663 |
18.73 |
| 2026-02-20 00:00 |
07:09:05.85 |
+32:29:23.3 |
HIP 34663 |
21.93 |
| 2026-02-20 12:00 |
07:08:48.75 |
+32:29:47.3 |
HIP 34323 |
24.02 |
| 2026-02-21 00:00 |
07:08:31.92 |
+32:30:10.2 |
HIP 34323 |
20.55 |
| 2026-02-21 12:00 |
07:08:15.35 |
+32:30:32.2 |
HIP 34323 |
17.16 |
| 2026-02-22 00:00 |
07:07:59.05 |
+32:30:53.1 |
HIP 34323 |
13.90 |
| 2026-02-22 12:00 |
07:07:43.03 |
+32:31:13.1 |
HIP 34323 |
10.79 |
| 2026-02-23 00:00 |
07:07:27.27 |
+32:31:32.0 |
HIP 34323 |
7.98 |
| 2026-02-23 12:00 |
07:07:11.79 |
+32:31:49.9 |
HIP 34323 |
5.77 |
| 2026-02-24 00:00 |
07:06:56.58 |
+32:32:06.9 |
HIP 34323 |
4.92 |