| Parameter |
Value |
| Designation |
P/2016 A7 (PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2016-02-25T20:41:32.879040Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:21Z |
| Obs used |
46 |
| NEO |
- |
| M1 |
7.800 |
| K1 |
33.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2016-03-18.0000000 |
| e |
0.56662578 |
| q (au) |
2.176649 |
| a (au) |
5.022563 |
| i (deg) |
16.637470 |
| Ω (om, deg) |
221.466093 |
| ω (w, deg) |
352.469583 |
| M (ma, deg) |
1.850871 |
Magnitude
Scatter + Global Linear
$$
M_a = (13.342 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
13.342 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.998 |
| k |
1.000 |
| 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 |
06:16:04.60 |
+07:46:50.4 |
HIP 29719 |
10.52 |
| 2026-03-26 12:00 |
06:16:16.47 |
+07:48:13.8 |
HIP 29719 |
13.59 |
| 2026-03-27 00:00 |
06:16:28.58 |
+07:49:36.8 |
HIP 29719 |
16.77 |
| 2026-03-27 12:00 |
06:16:40.93 |
+07:50:59.4 |
HIP 29719 |
20.04 |
| 2026-03-28 00:00 |
06:16:53.51 |
+07:52:21.6 |
HIP 29719 |
23.37 |
| 2026-03-28 12:00 |
06:17:06.32 |
+07:53:43.4 |
HIP 29719 |
26.77 |
| 2026-03-29 00:00 |
06:17:19.36 |
+07:55:04.8 |
HIP 29868 |
28.46 |
| 2026-03-29 12:00 |
06:17:32.63 |
+07:56:25.8 |
HIP 29868 |
29.96 |
| 2026-03-30 00:00 |
06:17:46.13 |
+07:57:46.3 |
HIP 29868 |
31.79 |
| 2026-03-30 12:00 |
06:17:59.86 |
+07:59:06.5 |
HIP 29896 |
32.38 |
| 2026-03-31 00:00 |
06:18:13.81 |
+08:00:26.2 |
HIP 29896 |
31.74 |
| 2026-03-31 12:00 |
06:18:27.99 |
+08:01:45.4 |
HIP 29896 |
31.55 |
| 2026-04-01 00:00 |
06:18:42.40 |
+08:03:04.2 |
HIP 30120 |
30.79 |
| 2026-04-01 12:00 |
06:18:57.02 |
+08:04:22.6 |
HIP 30120 |
29.07 |
| 2026-04-02 00:00 |
06:19:11.87 |
+08:05:40.4 |
HIP 30120 |
27.74 |
| 2026-04-02 12:00 |
06:19:26.94 |
+08:06:57.8 |
HIP 30120 |
26.88 |
| 2026-04-03 00:00 |
06:19:42.23 |
+08:08:14.7 |
HIP 30120 |
26.56 |
| 2026-04-03 12:00 |
06:19:57.74 |
+08:09:31.2 |
HIP 30120 |
26.82 |
| 2026-04-04 00:00 |
06:20:13.47 |
+08:10:47.1 |
HIP 30120 |
27.67 |
| 2026-04-04 12:00 |
06:20:29.42 |
+08:12:02.5 |
HIP 30297 |
28.99 |
| 2026-04-05 00:00 |
06:20:45.58 |
+08:13:17.4 |
HIP 30297 |
24.81 |
| 2026-04-05 12:00 |
06:21:01.96 |
+08:14:31.8 |
HIP 30297 |
20.57 |
| 2026-04-06 00:00 |
06:21:18.55 |
+08:15:45.7 |
HIP 30297 |
16.29 |
| 2026-04-06 12:00 |
06:21:35.35 |
+08:16:59.0 |
HIP 30297 |
11.97 |
| 2026-04-07 00:00 |
06:21:52.37 |
+08:18:11.8 |
HIP 30297 |
7.60 |
| 2026-04-07 12:00 |
06:22:09.60 |
+08:19:24.1 |
HIP 30297 |
3.21 |
| 2026-04-08 00:00 |
06:22:27.03 |
+08:20:35.8 |
HIP 30297 |
1.49 |
| 2026-04-08 12:00 |
06:22:44.68 |
+08:21:46.9 |
HIP 30297 |
5.89 |
| 2026-04-09 00:00 |
06:23:02.54 |
+08:22:57.5 |
HIP 30297 |
10.44 |
| 2026-04-09 12:00 |
06:23:20.60 |
+08:24:07.5 |
HIP 30443 |
11.53 |
| 2026-04-10 00:00 |
06:23:38.87 |
+08:25:16.9 |
HIP 30443 |
8.95 |
| 2026-04-10 12:00 |
06:23:57.35 |
+08:26:25.7 |
HIP 30485 |
8.39 |
| 2026-04-11 00:00 |
06:24:16.03 |
+08:27:33.9 |
HIP 30485 |
5.03 |
| 2026-04-11 12:00 |
06:24:34.91 |
+08:28:41.5 |
HIP 30485 |
5.04 |
| 2026-04-12 00:00 |
06:24:54.00 |
+08:29:48.6 |
HIP 30485 |
8.50 |
| 2026-04-12 12:00 |
06:25:13.29 |
+08:30:55.0 |
HIP 30485 |
12.92 |
| 2026-04-13 00:00 |
06:25:32.77 |
+08:32:00.7 |
HIP 30631 |
12.49 |
| 2026-04-13 12:00 |
06:25:52.46 |
+08:33:05.9 |
HIP 30631 |
8.38 |
| 2026-04-14 00:00 |
06:26:12.35 |
+08:34:10.4 |
HIP 30631 |
5.86 |
| 2026-04-14 12:00 |
06:26:32.44 |
+08:35:14.2 |
HIP 30686 |
6.98 |
| 2026-04-15 00:00 |
06:26:52.72 |
+08:36:17.4 |
HIP 30686 |
3.30 |
| 2026-04-15 12:00 |
06:27:13.19 |
+08:37:19.9 |
HIP 30686 |
5.10 |
| 2026-04-16 00:00 |
06:27:33.87 |
+08:38:21.8 |
HIP 30686 |
9.77 |