C/2016 C1 (PANSTARRS)
| Parameter |
Value |
| Designation |
C/2016 C1 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2016-02-19T07:06:40.415040Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:23Z |
| Obs used |
236 |
| NEO |
- |
| M1 |
6.500 |
| K1 |
8.500 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2017-08-02.0000000 |
| e |
1.00512425 |
| q (au) |
8.462645 |
| a (au) |
-1651.490288 |
| i (deg) |
56.178888 |
| Ω (om, deg) |
181.780057 |
| ω (w, deg) |
328.739361 |
| M (ma, deg) |
0.007779 |
Magnitude
Scatter + Global Linear
$$
M_a = (0.005 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
0.005 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.940 |
| 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
Residuals (Piecewise)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| Start (UTC) |
End (UTC) |
a |
b |
| 2016-03-01 |
2018-04-25 |
+15.4198 |
-14.566 |
| 2018-04-25 |
2020-05-24 |
+23.5230 |
-22.797 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
16:39:58.26 |
+29:01:53.2 |
HIP 81644 |
11.90 |
| 2026-02-03 12:00 |
16:40:02.47 |
+29:02:52.6 |
HIP 81644 |
11.81 |
| 2026-02-04 00:00 |
16:40:06.63 |
+29:03:52.3 |
HIP 81644 |
11.88 |
| 2026-02-04 12:00 |
16:40:10.75 |
+29:04:52.3 |
HIP 81644 |
12.12 |
| 2026-02-05 00:00 |
16:40:14.81 |
+29:05:52.7 |
HIP 81644 |
12.51 |
| 2026-02-05 12:00 |
16:40:18.83 |
+29:06:53.4 |
HIP 81644 |
13.03 |
| 2026-02-06 00:00 |
16:40:22.80 |
+29:07:54.4 |
HIP 81560 |
13.42 |
| 2026-02-06 12:00 |
16:40:26.72 |
+29:08:55.7 |
HIP 81560 |
13.88 |
| 2026-02-07 00:00 |
16:40:30.60 |
+29:09:57.4 |
HIP 81560 |
14.43 |
| 2026-02-07 12:00 |
16:40:34.42 |
+29:10:59.3 |
HIP 81560 |
15.06 |
| 2026-02-08 00:00 |
16:40:38.19 |
+29:12:01.6 |
HIP 81560 |
15.77 |
| 2026-02-08 12:00 |
16:40:41.92 |
+29:13:04.1 |
HIP 81560 |
16.55 |
| 2026-02-09 00:00 |
16:40:45.59 |
+29:14:06.9 |
HIP 81560 |
17.38 |
| 2026-02-09 12:00 |
16:40:49.22 |
+29:15:10.1 |
HIP 81560 |
18.26 |
| 2026-02-10 00:00 |
16:40:52.79 |
+29:16:13.5 |
HIP 81560 |
19.17 |
| 2026-02-10 12:00 |
16:40:56.32 |
+29:17:17.2 |
HIP 81560 |
20.13 |
| 2026-02-11 00:00 |
16:40:59.79 |
+29:18:21.2 |
HIP 81560 |
21.11 |
| 2026-02-11 12:00 |
16:41:03.21 |
+29:19:25.4 |
HIP 81560 |
22.11 |
| 2026-02-12 00:00 |
16:41:06.59 |
+29:20:30.0 |
HIP 81560 |
23.14 |
| 2026-02-12 12:00 |
16:41:09.91 |
+29:21:34.8 |
HIP 81560 |
24.18 |
| 2026-02-13 00:00 |
16:41:13.17 |
+29:22:39.8 |
HIP 81560 |
25.24 |
| 2026-02-13 12:00 |
16:41:16.39 |
+29:23:45.1 |
HIP 81560 |
26.31 |
| 2026-02-14 00:00 |
16:41:19.56 |
+29:24:50.7 |
HIP 81560 |
27.39 |
| 2026-02-14 12:00 |
16:41:22.67 |
+29:25:56.5 |
HIP 81630 |
28.18 |
| 2026-02-15 00:00 |
16:41:25.73 |
+29:27:02.6 |
HIP 81630 |
27.48 |
| 2026-02-15 12:00 |
16:41:28.74 |
+29:28:08.9 |
HIP 81630 |
26.82 |
| 2026-02-16 00:00 |
16:41:31.69 |
+29:29:15.4 |
HIP 81630 |
26.19 |
| 2026-02-16 12:00 |
16:41:34.59 |
+29:30:22.2 |
HIP 81630 |
25.60 |
| 2026-02-17 00:00 |
16:41:37.44 |
+29:31:29.2 |
HIP 81630 |
25.05 |
| 2026-02-17 12:00 |
16:41:40.24 |
+29:32:36.4 |
HIP 81630 |
24.54 |
| 2026-02-18 00:00 |
16:41:42.98 |
+29:33:43.8 |
HIP 81630 |
24.08 |
| 2026-02-18 12:00 |
16:41:45.66 |
+29:34:51.4 |
HIP 81630 |
23.67 |
| 2026-02-19 00:00 |
16:41:48.30 |
+29:35:59.3 |
HIP 81630 |
23.32 |
| 2026-02-19 12:00 |
16:41:50.88 |
+29:37:07.3 |
HIP 81630 |
23.01 |
| 2026-02-20 00:00 |
16:41:53.40 |
+29:38:15.5 |
HIP 81630 |
22.76 |
| 2026-02-20 12:00 |
16:41:55.88 |
+29:39:24.0 |
HIP 81630 |
22.56 |
| 2026-02-21 00:00 |
16:41:58.29 |
+29:40:32.6 |
HIP 81630 |
22.42 |
| 2026-02-21 12:00 |
16:42:00.66 |
+29:41:41.4 |
HIP 81630 |
22.34 |
| 2026-02-22 00:00 |
16:42:02.96 |
+29:42:50.3 |
HIP 81630 |
22.32 |
| 2026-02-22 12:00 |
16:42:05.22 |
+29:43:59.5 |
HIP 81630 |
22.36 |
| 2026-02-23 00:00 |
16:42:07.42 |
+29:45:08.8 |
HIP 81630 |
22.45 |
| 2026-02-23 12:00 |
16:42:09.56 |
+29:46:18.2 |
HIP 81630 |
22.60 |
| 2026-02-24 00:00 |
16:42:11.65 |
+29:47:27.8 |
HIP 81630 |
22.80 |