C/2014 S2 (PANSTARRS)
| Parameter |
Value |
| Designation |
C/2014 S2 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2015-12-09T19:08:29.909760Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:00Z |
| Obs used |
2941 |
| NEO |
- |
| M1 |
6.000 |
| K1 |
13.250 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2016-01-10.0000000 |
| e |
0.98762625 |
| q (au) |
2.100643 |
| a (au) |
169.766118 |
| i (deg) |
64.670381 |
| Ω (om, deg) |
8.122248 |
| ω (w, deg) |
87.806610 |
| M (ma, deg) |
0.013903 |
Magnitude
Scatter + Global Linear
$$
M_a = (5.333 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
5.333 |
| n |
6.000 |
| gf |
0.802 |
| gb |
-0.500 |
| k |
0.936 |
| δ90 |
1.000 |
| 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 |
| 2014-04-28 |
2014-09-22 |
-130.4874 |
+94.192 |
| 2014-09-22 |
2015-09-01 |
+1.8348 |
+0.720 |
| 2015-09-01 |
2015-12-09 |
+36.6595 |
-12.908 |
| 2015-12-09 |
2017-04-01 |
+2.8014 |
-2.446 |
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 |
12:57:41.74 |
-58:48:11.1 |
HIP 63275 |
17.05 |
| 2026-02-03 12:00 |
12:57:37.59 |
-58:49:01.2 |
HIP 63275 |
16.32 |
| 2026-02-04 00:00 |
12:57:33.37 |
-58:49:51.0 |
HIP 63275 |
15.62 |
| 2026-02-04 12:00 |
12:57:29.07 |
-58:50:40.4 |
HIP 63275 |
14.96 |
| 2026-02-05 00:00 |
12:57:24.71 |
-58:51:29.4 |
HIP 63275 |
14.35 |
| 2026-02-05 12:00 |
12:57:20.27 |
-58:52:18.1 |
HIP 63275 |
13.79 |
| 2026-02-06 00:00 |
12:57:15.76 |
-58:53:06.3 |
HIP 63275 |
13.29 |
| 2026-02-06 12:00 |
12:57:11.18 |
-58:53:54.2 |
HIP 63275 |
12.86 |
| 2026-02-07 00:00 |
12:57:06.53 |
-58:54:41.7 |
HIP 63275 |
12.50 |
| 2026-02-07 12:00 |
12:57:01.80 |
-58:55:28.7 |
HIP 63275 |
12.23 |
| 2026-02-08 00:00 |
12:56:57.01 |
-58:56:15.4 |
HIP 63275 |
12.04 |
| 2026-02-08 12:00 |
12:56:52.15 |
-58:57:01.6 |
HIP 63275 |
11.94 |
| 2026-02-09 00:00 |
12:56:47.21 |
-58:57:47.4 |
HIP 63275 |
11.94 |
| 2026-02-09 12:00 |
12:56:42.21 |
-58:58:32.9 |
HIP 63275 |
12.03 |
| 2026-02-10 00:00 |
12:56:37.13 |
-58:59:17.9 |
HIP 63049 |
11.56 |
| 2026-02-10 12:00 |
12:56:31.99 |
-59:00:02.4 |
HIP 63049 |
10.81 |
| 2026-02-11 00:00 |
12:56:26.78 |
-59:00:46.6 |
HIP 63049 |
10.09 |
| 2026-02-11 12:00 |
12:56:21.50 |
-59:01:30.3 |
HIP 63049 |
9.41 |
| 2026-02-12 00:00 |
12:56:16.16 |
-59:02:13.5 |
HIP 63049 |
8.78 |
| 2026-02-12 12:00 |
12:56:10.74 |
-59:02:56.4 |
HIP 63049 |
8.21 |
| 2026-02-13 00:00 |
12:56:05.26 |
-59:03:38.7 |
HIP 63049 |
7.73 |
| 2026-02-13 12:00 |
12:55:59.71 |
-59:04:20.7 |
HIP 63049 |
7.33 |
| 2026-02-14 00:00 |
12:55:54.10 |
-59:05:02.2 |
HIP 63049 |
7.05 |
| 2026-02-14 12:00 |
12:55:48.41 |
-59:05:43.2 |
HIP 63049 |
6.89 |
| 2026-02-15 00:00 |
12:55:42.67 |
-59:06:23.8 |
HIP 63049 |
6.86 |
| 2026-02-15 12:00 |
12:55:36.86 |
-59:07:03.9 |
HIP 63049 |
6.97 |
| 2026-02-16 00:00 |
12:55:30.98 |
-59:07:43.5 |
HIP 63007 |
6.72 |
| 2026-02-16 12:00 |
12:55:25.04 |
-59:08:22.7 |
HIP 63007 |
5.89 |
| 2026-02-17 00:00 |
12:55:19.04 |
-59:09:01.4 |
HIP 63007 |
5.11 |
| 2026-02-17 12:00 |
12:55:12.97 |
-59:09:39.6 |
HIP 63007 |
4.41 |
| 2026-02-18 00:00 |
12:55:06.84 |
-59:10:17.3 |
HIP 63007 |
3.84 |
| 2026-02-18 12:00 |
12:55:00.65 |
-59:10:54.6 |
HIP 63007 |
3.46 |
| 2026-02-19 00:00 |
12:54:54.39 |
-59:11:31.4 |
HIP 63007 |
3.35 |
| 2026-02-19 12:00 |
12:54:48.08 |
-59:12:07.7 |
HIP 63007 |
3.52 |
| 2026-02-20 00:00 |
12:54:41.70 |
-59:12:43.4 |
HIP 63007 |
3.94 |
| 2026-02-20 12:00 |
12:54:35.27 |
-59:13:18.7 |
HIP 63007 |
4.54 |
| 2026-02-21 00:00 |
12:54:28.77 |
-59:13:53.5 |
HIP 63007 |
5.27 |
| 2026-02-21 12:00 |
12:54:22.22 |
-59:14:27.8 |
HIP 63007 |
6.07 |
| 2026-02-22 00:00 |
12:54:15.61 |
-59:15:01.6 |
HIP 63007 |
6.92 |
| 2026-02-22 12:00 |
12:54:08.94 |
-59:15:34.9 |
HIP 63007 |
7.81 |
| 2026-02-23 00:00 |
12:54:02.21 |
-59:16:07.7 |
HIP 63007 |
8.73 |
| 2026-02-23 12:00 |
12:53:55.43 |
-59:16:40.0 |
HIP 63007 |
9.66 |
| 2026-02-24 00:00 |
12:53:48.59 |
-59:17:11.7 |
HIP 63007 |
10.60 |