C/2016 A6 (PANSTARRS)
| 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 |
1.000 |
| 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) |
| 2026-02-03 00:00 |
01:56:28.51 |
-48:31:29.1 |
HIP 9108 |
10.44 |
| 2026-02-03 12:00 |
01:56:29.41 |
-48:30:25.2 |
HIP 9108 |
11.00 |
| 2026-02-04 00:00 |
01:56:30.37 |
-48:29:21.3 |
HIP 9108 |
11.62 |
| 2026-02-04 12:00 |
01:56:31.38 |
-48:28:17.4 |
HIP 9108 |
12.29 |
| 2026-02-05 00:00 |
01:56:32.46 |
-48:27:13.6 |
HIP 9108 |
13.02 |
| 2026-02-05 12:00 |
01:56:33.59 |
-48:26:09.9 |
HIP 9108 |
13.78 |
| 2026-02-06 00:00 |
01:56:34.77 |
-48:25:06.2 |
HIP 9108 |
14.58 |
| 2026-02-06 12:00 |
01:56:36.02 |
-48:24:02.6 |
HIP 9108 |
15.41 |
| 2026-02-07 00:00 |
01:56:37.32 |
-48:22:59.1 |
HIP 9108 |
16.26 |
| 2026-02-07 12:00 |
01:56:38.68 |
-48:21:55.6 |
HIP 9108 |
17.13 |
| 2026-02-08 00:00 |
01:56:40.09 |
-48:20:52.2 |
HIP 9108 |
18.02 |
| 2026-02-08 12:00 |
01:56:41.56 |
-48:19:49.0 |
HIP 9108 |
18.93 |
| 2026-02-09 00:00 |
01:56:43.08 |
-48:18:45.8 |
HIP 9108 |
19.85 |
| 2026-02-09 12:00 |
01:56:44.66 |
-48:17:42.7 |
HIP 9108 |
20.78 |
| 2026-02-10 00:00 |
01:56:46.29 |
-48:16:39.7 |
HIP 9108 |
21.72 |
| 2026-02-10 12:00 |
01:56:47.98 |
-48:15:36.8 |
HIP 9108 |
22.67 |
| 2026-02-11 00:00 |
01:56:49.73 |
-48:14:34.0 |
HIP 9108 |
23.63 |
| 2026-02-11 12:00 |
01:56:51.53 |
-48:13:31.4 |
HIP 9108 |
24.59 |
| 2026-02-12 00:00 |
01:56:53.38 |
-48:12:28.8 |
HIP 8994 |
24.97 |
| 2026-02-12 12:00 |
01:56:55.28 |
-48:11:26.4 |
HIP 8994 |
24.16 |
| 2026-02-13 00:00 |
01:56:57.24 |
-48:10:24.1 |
HIP 8994 |
23.38 |
| 2026-02-13 12:00 |
01:56:59.26 |
-48:09:22.0 |
HIP 8994 |
22.63 |
| 2026-02-14 00:00 |
01:57:01.32 |
-48:08:20.0 |
HIP 8994 |
21.92 |
| 2026-02-14 12:00 |
01:57:03.44 |
-48:07:18.1 |
HIP 8994 |
21.24 |
| 2026-02-15 00:00 |
01:57:05.61 |
-48:06:16.4 |
HIP 8994 |
20.61 |
| 2026-02-15 12:00 |
01:57:07.84 |
-48:05:14.8 |
HIP 8994 |
20.03 |
| 2026-02-16 00:00 |
01:57:10.11 |
-48:04:13.4 |
HIP 8994 |
19.50 |
| 2026-02-16 12:00 |
01:57:12.44 |
-48:03:12.1 |
HIP 8994 |
19.02 |
| 2026-02-17 00:00 |
01:57:14.82 |
-48:02:11.0 |
HIP 8994 |
18.61 |
| 2026-02-17 12:00 |
01:57:17.25 |
-48:01:10.1 |
HIP 8994 |
18.26 |
| 2026-02-18 00:00 |
01:57:19.73 |
-48:00:09.4 |
HIP 8994 |
17.98 |
| 2026-02-18 12:00 |
01:57:22.26 |
-47:59:08.8 |
HIP 9206 |
16.94 |
| 2026-02-19 00:00 |
01:57:24.84 |
-47:58:08.4 |
HIP 9206 |
15.89 |
| 2026-02-19 12:00 |
01:57:27.47 |
-47:57:08.2 |
HIP 9206 |
14.85 |
| 2026-02-20 00:00 |
01:57:30.14 |
-47:56:08.2 |
HIP 9206 |
13.80 |
| 2026-02-20 12:00 |
01:57:32.87 |
-47:55:08.4 |
HIP 9206 |
12.77 |
| 2026-02-21 00:00 |
01:57:35.65 |
-47:54:08.8 |
HIP 9206 |
11.74 |
| 2026-02-21 12:00 |
01:57:38.47 |
-47:53:09.4 |
HIP 9206 |
10.72 |
| 2026-02-22 00:00 |
01:57:41.34 |
-47:52:10.2 |
HIP 9206 |
9.71 |
| 2026-02-22 12:00 |
01:57:44.26 |
-47:51:11.2 |
HIP 9206 |
8.72 |
| 2026-02-23 00:00 |
01:57:47.23 |
-47:50:12.5 |
HIP 9206 |
7.76 |
| 2026-02-23 12:00 |
01:57:50.24 |
-47:49:13.9 |
HIP 9206 |
6.83 |
| 2026-02-24 00:00 |
01:57:53.30 |
-47:48:15.6 |
HIP 9206 |
5.95 |