P/2016 A3 (PANSTARRS)
| Parameter |
Value |
| Designation |
P/2016 A3 (PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2017-04-13T17:31:26.886720Z |
| Orbit solution date (soln_date, UTC) |
2022-07-31T01:43:22Z |
| Obs used |
198 |
| NEO |
- |
| M1 |
4.300 |
| K1 |
17.250 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2017-05-17.0000000 |
| e |
0.38019712 |
| q (au) |
4.789503 |
| a (au) |
7.727462 |
| i (deg) |
8.593880 |
| Ω (om, deg) |
187.794592 |
| ω (w, deg) |
338.486358 |
| M (ma, deg) |
1.526509 |
Magnitude
Scatter + Global Linear
$$
M_a = (5.010 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
5.010 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.971 |
| 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) |
| 2026-02-03 00:00 |
21:57:10.91 |
-07:27:26.0 |
HIP 108303 |
12.43 |
| 2026-02-03 12:00 |
21:57:22.96 |
-07:26:28.7 |
HIP 108303 |
15.50 |
| 2026-02-04 00:00 |
21:57:35.03 |
-07:25:31.2 |
HIP 108462 |
14.18 |
| 2026-02-04 12:00 |
21:57:47.10 |
-07:24:33.5 |
HIP 108462 |
12.63 |
| 2026-02-05 00:00 |
21:57:59.19 |
-07:23:35.6 |
HIP 108462 |
11.74 |
| 2026-02-05 12:00 |
21:58:11.28 |
-07:22:37.5 |
HIP 108462 |
11.65 |
| 2026-02-06 00:00 |
21:58:23.39 |
-07:21:39.2 |
HIP 108462 |
12.40 |
| 2026-02-06 12:00 |
21:58:35.51 |
-07:20:40.7 |
HIP 108462 |
13.85 |
| 2026-02-07 00:00 |
21:58:47.64 |
-07:19:42.0 |
HIP 108462 |
15.81 |
| 2026-02-07 12:00 |
21:58:59.78 |
-07:18:43.1 |
HIP 108462 |
18.12 |
| 2026-02-08 00:00 |
21:59:11.92 |
-07:17:44.0 |
HIP 108462 |
20.66 |
| 2026-02-08 12:00 |
21:59:24.08 |
-07:16:44.7 |
HIP 108462 |
23.36 |
| 2026-02-09 00:00 |
21:59:36.24 |
-07:15:45.2 |
HIP 108462 |
26.17 |
| 2026-02-09 12:00 |
21:59:48.41 |
-07:14:45.6 |
HIP 108462 |
29.05 |
| 2026-02-10 00:00 |
22:00:00.59 |
-07:13:45.7 |
HIP 108462 |
32.00 |
| 2026-02-10 12:00 |
22:00:12.77 |
-07:12:45.7 |
HIP 108462 |
34.99 |
| 2026-02-11 00:00 |
22:00:24.96 |
-07:11:45.5 |
HIP 108462 |
38.01 |
| 2026-02-11 12:00 |
22:00:37.15 |
-07:10:45.1 |
HIP 108851 |
36.68 |
| 2026-02-12 00:00 |
22:00:49.35 |
-07:09:44.6 |
HIP 108851 |
33.60 |
| 2026-02-12 12:00 |
22:01:01.55 |
-07:08:43.9 |
HIP 108851 |
30.54 |
| 2026-02-13 00:00 |
22:01:13.76 |
-07:07:43.0 |
HIP 108851 |
27.51 |
| 2026-02-13 12:00 |
22:01:25.96 |
-07:06:42.0 |
HIP 108851 |
24.52 |
| 2026-02-14 00:00 |
22:01:38.17 |
-07:05:40.8 |
HIP 108851 |
21.58 |
| 2026-02-14 12:00 |
22:01:50.39 |
-07:04:39.5 |
HIP 108851 |
18.74 |
| 2026-02-15 00:00 |
22:02:02.60 |
-07:03:38.0 |
HIP 108851 |
16.03 |
| 2026-02-15 12:00 |
22:02:14.81 |
-07:02:36.4 |
HIP 108851 |
13.53 |
| 2026-02-16 00:00 |
22:02:27.03 |
-07:01:34.6 |
HIP 108851 |
11.39 |
| 2026-02-16 12:00 |
22:02:39.24 |
-07:00:32.7 |
HIP 108851 |
9.84 |
| 2026-02-17 00:00 |
22:02:51.45 |
-06:59:30.7 |
HIP 108851 |
9.20 |
| 2026-02-17 12:00 |
22:03:03.66 |
-06:58:28.5 |
HIP 108851 |
9.63 |
| 2026-02-18 00:00 |
22:03:15.87 |
-06:57:26.2 |
HIP 108851 |
11.03 |
| 2026-02-18 12:00 |
22:03:28.07 |
-06:56:23.7 |
HIP 108851 |
13.08 |
| 2026-02-19 00:00 |
22:03:40.27 |
-06:55:21.1 |
HIP 108851 |
15.52 |
| 2026-02-19 12:00 |
22:03:52.47 |
-06:54:18.5 |
HIP 108851 |
18.20 |
| 2026-02-20 00:00 |
22:04:04.66 |
-06:53:15.7 |
HIP 108851 |
21.03 |
| 2026-02-20 12:00 |
22:04:16.85 |
-06:52:12.7 |
HIP 108851 |
23.95 |
| 2026-02-21 00:00 |
22:04:29.03 |
-06:51:09.7 |
HIP 108868 |
26.79 |
| 2026-02-21 12:00 |
22:04:41.21 |
-06:50:06.6 |
HIP 108868 |
28.20 |
| 2026-02-22 00:00 |
22:04:53.38 |
-06:49:03.4 |
HIP 109167 |
28.56 |
| 2026-02-22 12:00 |
22:05:05.54 |
-06:48:00.0 |
HIP 109167 |
25.40 |
| 2026-02-23 00:00 |
22:05:17.69 |
-06:46:56.6 |
HIP 109167 |
22.26 |
| 2026-02-23 12:00 |
22:05:29.83 |
-06:45:53.1 |
HIP 109167 |
19.13 |
| 2026-02-24 00:00 |
22:05:41.97 |
-06:44:49.5 |
HIP 109167 |
16.04 |