| Parameter |
Value |
| Designation |
C/2016 A6 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2015-11-05T22:12:03.853440Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:21Z |
| Obs used |
42 |
| NEO |
- |
| M1 |
7.900 |
| K1 |
28.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2016-01-20.0000000 |
| e |
0.99059983 |
| q (au) |
2.412923 |
| a (au) |
256.689319 |
| i (deg) |
120.934185 |
| Ω (om, deg) |
300.253669 |
| ω (w, deg) |
141.118673 |
| M (ma, deg) |
0.017992 |
Magnitude
Scatter + Global Linear
$$
M_a = (16.450 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
16.450 |
| n |
6.000 |
| gf |
0.999 |
| gb |
-0.764 |
| 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) |
| 2026-07-29 00:00 |
02:19:08.39 |
-48:18:44.7 |
HIP 10983 |
24.17 |
| 2026-07-29 12:00 |
02:19:07.81 |
-48:19:49.3 |
HIP 10983 |
24.28 |
| 2026-07-30 00:00 |
02:19:07.18 |
-48:20:54.0 |
HIP 10983 |
24.46 |
| 2026-07-30 12:00 |
02:19:06.49 |
-48:21:58.9 |
HIP 10983 |
24.69 |
| 2026-07-31 00:00 |
02:19:05.74 |
-48:23:03.8 |
HIP 10983 |
24.97 |
| 2026-07-31 12:00 |
02:19:04.93 |
-48:24:08.8 |
HIP 10983 |
25.31 |
| 2026-08-01 00:00 |
02:19:04.07 |
-48:25:14.0 |
HIP 10983 |
25.70 |
| 2026-08-01 12:00 |
02:19:03.15 |
-48:26:19.2 |
HIP 10983 |
26.13 |
| 2026-08-02 00:00 |
02:19:02.17 |
-48:27:24.5 |
HIP 10983 |
26.62 |
| 2026-08-02 12:00 |
02:19:01.13 |
-48:28:29.9 |
HIP 10983 |
27.15 |
| 2026-08-03 00:00 |
02:19:00.04 |
-48:29:35.4 |
HIP 10983 |
27.73 |
| 2026-08-03 12:00 |
02:18:58.89 |
-48:30:40.9 |
HIP 10983 |
28.34 |
| 2026-08-04 00:00 |
02:18:57.67 |
-48:31:46.5 |
HIP 10983 |
28.99 |
| 2026-08-04 12:00 |
02:18:56.40 |
-48:32:52.2 |
HIP 10983 |
29.68 |
| 2026-08-05 00:00 |
02:18:55.08 |
-48:33:57.9 |
HIP 10983 |
30.41 |
| 2026-08-05 12:00 |
02:18:53.69 |
-48:35:03.7 |
HIP 11011 |
30.36 |
| 2026-08-06 00:00 |
02:18:52.25 |
-48:36:09.5 |
HIP 11011 |
30.27 |
| 2026-08-06 12:00 |
02:18:50.74 |
-48:37:15.3 |
HIP 11011 |
30.23 |
| 2026-08-07 00:00 |
02:18:49.18 |
-48:38:21.2 |
HIP 11011 |
30.25 |
| 2026-08-07 12:00 |
02:18:47.56 |
-48:39:27.2 |
HIP 11011 |
30.31 |
| 2026-08-08 00:00 |
02:18:45.88 |
-48:40:33.2 |
HIP 11011 |
30.43 |
| 2026-08-08 12:00 |
02:18:44.14 |
-48:41:39.1 |
HIP 11011 |
30.59 |
| 2026-08-09 00:00 |
02:18:42.34 |
-48:42:45.1 |
HIP 11011 |
30.81 |
| 2026-08-09 12:00 |
02:18:40.49 |
-48:43:51.2 |
HIP 11011 |
31.08 |
| 2026-08-10 00:00 |
02:18:38.57 |
-48:44:57.2 |
HIP 11011 |
31.39 |
| 2026-08-10 12:00 |
02:18:36.60 |
-48:46:03.2 |
HIP 11011 |
31.75 |
| 2026-08-11 00:00 |
02:18:34.57 |
-48:47:09.2 |
HIP 11011 |
32.16 |
| 2026-08-11 12:00 |
02:18:32.47 |
-48:48:15.3 |
HIP 11011 |
32.62 |
| 2026-08-12 00:00 |
02:18:30.32 |
-48:49:21.3 |
HIP 11011 |
33.12 |
| 2026-08-12 12:00 |
02:18:28.11 |
-48:50:27.3 |
HIP 11011 |
33.65 |
| 2026-08-13 00:00 |
02:18:25.85 |
-48:51:33.2 |
HIP 10696 |
32.98 |
| 2026-08-13 12:00 |
02:18:23.52 |
-48:52:39.2 |
HIP 10696 |
31.83 |
| 2026-08-14 00:00 |
02:18:21.13 |
-48:53:45.0 |
HIP 10696 |
30.67 |
| 2026-08-14 12:00 |
02:18:18.69 |
-48:54:50.9 |
HIP 10696 |
29.51 |
| 2026-08-15 00:00 |
02:18:16.18 |
-48:55:56.7 |
HIP 10696 |
28.36 |
| 2026-08-15 12:00 |
02:18:13.62 |
-48:57:02.5 |
HIP 10696 |
27.20 |
| 2026-08-16 00:00 |
02:18:11.00 |
-48:58:08.2 |
HIP 10696 |
26.05 |
| 2026-08-16 12:00 |
02:18:08.32 |
-48:59:13.8 |
HIP 10696 |
24.89 |
| 2026-08-17 00:00 |
02:18:05.59 |
-49:00:19.4 |
HIP 10696 |
23.74 |
| 2026-08-17 12:00 |
02:18:02.79 |
-49:01:24.9 |
HIP 10696 |
22.59 |
| 2026-08-18 00:00 |
02:17:59.94 |
-49:02:30.3 |
HIP 10696 |
21.44 |
| 2026-08-18 12:00 |
02:17:57.03 |
-49:03:35.6 |
HIP 10696 |
20.30 |
| 2026-08-19 00:00 |
02:17:54.06 |
-49:04:40.9 |
HIP 10696 |
19.17 |