| 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) |
| 2026-07-29 00:00 |
22:27:15.89 |
-04:13:37.0 |
HIP 111009 |
31.95 |
| 2026-07-29 12:00 |
22:27:09.01 |
-04:14:15.0 |
HIP 111009 |
33.71 |
| 2026-07-30 00:00 |
22:27:02.07 |
-04:14:53.5 |
HIP 111009 |
35.49 |
| 2026-07-30 12:00 |
22:26:55.09 |
-04:15:32.4 |
HIP 111009 |
37.29 |
| 2026-07-31 00:00 |
22:26:48.05 |
-04:16:11.7 |
HIP 111009 |
39.11 |
| 2026-07-31 12:00 |
22:26:40.97 |
-04:16:51.3 |
HIP 111009 |
40.95 |
| 2026-08-01 00:00 |
22:26:33.84 |
-04:17:31.4 |
HIP 110920 |
41.88 |
| 2026-08-01 12:00 |
22:26:26.66 |
-04:18:11.9 |
HIP 110920 |
42.52 |
| 2026-08-02 00:00 |
22:26:19.44 |
-04:18:52.8 |
HIP 110920 |
43.24 |
| 2026-08-02 12:00 |
22:26:12.17 |
-04:19:34.0 |
HIP 110524 |
42.00 |
| 2026-08-03 00:00 |
22:26:04.85 |
-04:20:15.7 |
HIP 110524 |
40.07 |
| 2026-08-03 12:00 |
22:25:57.49 |
-04:20:57.7 |
HIP 110524 |
38.13 |
| 2026-08-04 00:00 |
22:25:50.09 |
-04:21:40.1 |
HIP 110524 |
36.18 |
| 2026-08-04 12:00 |
22:25:42.64 |
-04:22:22.9 |
HIP 110524 |
34.22 |
| 2026-08-05 00:00 |
22:25:35.16 |
-04:23:06.1 |
HIP 110524 |
32.25 |
| 2026-08-05 12:00 |
22:25:27.63 |
-04:23:49.6 |
HIP 110524 |
30.27 |
| 2026-08-06 00:00 |
22:25:20.06 |
-04:24:33.5 |
HIP 110524 |
28.29 |
| 2026-08-06 12:00 |
22:25:12.45 |
-04:25:17.7 |
HIP 110524 |
26.30 |
| 2026-08-07 00:00 |
22:25:04.80 |
-04:26:02.3 |
HIP 110524 |
24.31 |
| 2026-08-07 12:00 |
22:24:57.12 |
-04:26:47.3 |
HIP 110524 |
22.32 |
| 2026-08-08 00:00 |
22:24:49.40 |
-04:27:32.5 |
HIP 110524 |
20.34 |
| 2026-08-08 12:00 |
22:24:41.64 |
-04:28:18.2 |
HIP 110524 |
18.37 |
| 2026-08-09 00:00 |
22:24:33.85 |
-04:29:04.1 |
HIP 110524 |
16.41 |
| 2026-08-09 12:00 |
22:24:26.02 |
-04:29:50.4 |
HIP 110524 |
14.48 |
| 2026-08-10 00:00 |
22:24:18.16 |
-04:30:37.1 |
HIP 110524 |
12.59 |
| 2026-08-10 12:00 |
22:24:10.27 |
-04:31:24.0 |
HIP 110524 |
10.78 |
| 2026-08-11 00:00 |
22:24:02.34 |
-04:32:11.3 |
HIP 110524 |
9.10 |
| 2026-08-11 12:00 |
22:23:54.39 |
-04:32:58.9 |
HIP 110524 |
7.65 |
| 2026-08-12 00:00 |
22:23:46.41 |
-04:33:46.7 |
HIP 110524 |
6.57 |
| 2026-08-12 12:00 |
22:23:38.39 |
-04:34:34.9 |
HIP 110524 |
6.09 |
| 2026-08-13 00:00 |
22:23:30.35 |
-04:35:23.4 |
HIP 110524 |
6.34 |
| 2026-08-13 12:00 |
22:23:22.28 |
-04:36:12.2 |
HIP 110524 |
7.27 |
| 2026-08-14 00:00 |
22:23:14.19 |
-04:37:01.2 |
HIP 110524 |
8.66 |
| 2026-08-14 12:00 |
22:23:06.07 |
-04:37:50.5 |
HIP 110524 |
10.34 |
| 2026-08-15 00:00 |
22:22:57.93 |
-04:38:40.1 |
HIP 110524 |
12.18 |
| 2026-08-15 12:00 |
22:22:49.77 |
-04:39:30.0 |
HIP 110524 |
14.13 |
| 2026-08-16 00:00 |
22:22:41.58 |
-04:40:20.1 |
HIP 110524 |
16.15 |
| 2026-08-16 12:00 |
22:22:33.38 |
-04:41:10.5 |
HIP 110524 |
18.22 |
| 2026-08-17 00:00 |
22:22:25.15 |
-04:42:01.1 |
HIP 110524 |
20.32 |
| 2026-08-17 12:00 |
22:22:16.91 |
-04:42:52.0 |
HIP 110524 |
22.46 |
| 2026-08-18 00:00 |
22:22:08.65 |
-04:43:43.1 |
HIP 110524 |
24.61 |
| 2026-08-18 12:00 |
22:22:00.37 |
-04:44:34.5 |
HIP 110359 |
26.10 |
| 2026-08-19 00:00 |
22:21:52.07 |
-04:45:26.1 |
HIP 110359 |
24.34 |