C/2014 Q1 (PANSTARRS)
Metadata
| Parameter | Value |
|---|---|
| Designation | C/2014 Q1 (PANSTARRS) |
| Type | C |
| Perihelion (tp_cal, UTC) | 2015-07-06T12:15:56.439360Z |
| Orbit solution date (soln_date, UTC) | 2021-04-15T23:32:58Z |
| Obs used | 704 |
| NEO | - |
| M1 | 9.700 |
| K1 | 7.250 |
| PC | - |
Osculating Elements
| Parameter | Value |
|---|---|
| Epoch (epoch_cal, TDB) | 2015-02-17.0000000 |
| e | 0.99972226 |
| q (au) | 0.314572 |
| a (au) | 1132.604359 |
| i (deg) | 43.106721 |
| Ω (om, deg) | 8.762539 |
| ω (w, deg) | 120.050113 |
| M (ma, deg) | 359.996393 |
Magnitude
Scatter + Global Linear
$$ M_a = (11.191 + 3.199\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
Model Parameters
| Parameter | Value |
|---|---|
| H0 | 11.191 |
| n | 3.199 |
| gf | 0.996 |
| gb | -0.807 |
| k | 0.944 |
| δ90 | 9.807 |
| 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 |
|---|---|---|---|
| 2014-08-16 | 2015-01-14 | +6.2752 | -4.022 |
| 2015-01-14 | 2015-06-22 | +1.0263 | -1.086 |
| 2015-07-06 | 2015-08-05 | +6.6394 | -2.106 |
| 2015-08-05 | 2015-08-20 | +8.7741 | -1.094 |
| 2015-08-20 | 2016-05-13 | +2.6006 | -0.134 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) | RA (J2000) | Dec (J2000) | Nearest HIP | Dist from HIP (arcmin) |
|---|---|---|---|---|
| 2026-05-12 00:00 | 21:40:02.58 | -57:56:37.9 | HIP 107065 | 14.79 |
| 2026-05-12 12:00 | 21:40:02.98 | -57:57:21.4 | HIP 107065 | 15.37 |
| 2026-05-13 00:00 | 21:40:03.31 | -57:58:05.1 | HIP 107065 | 15.97 |
| 2026-05-13 12:00 | 21:40:03.58 | -57:58:49.0 | HIP 107065 | 16.59 |
| 2026-05-14 00:00 | 21:40:03.79 | -57:59:33.0 | HIP 107065 | 17.22 |
| 2026-05-14 12:00 | 21:40:03.92 | -58:00:17.2 | HIP 107065 | 17.87 |
| 2026-05-15 00:00 | 21:40:03.99 | -58:01:01.4 | HIP 107065 | 18.53 |
| 2026-05-15 12:00 | 21:40:04.00 | -58:01:45.9 | HIP 107065 | 19.20 |
| 2026-05-16 00:00 | 21:40:03.94 | -58:02:30.4 | HIP 107065 | 19.88 |
| 2026-05-16 12:00 | 21:40:03.81 | -58:03:15.1 | HIP 107065 | 20.57 |
| 2026-05-17 00:00 | 21:40:03.61 | -58:04:00.0 | HIP 107065 | 21.27 |
| 2026-05-17 12:00 | 21:40:03.35 | -58:04:44.9 | HIP 107065 | 21.98 |
| 2026-05-18 00:00 | 21:40:03.02 | -58:05:29.9 | HIP 107065 | 22.69 |
| 2026-05-18 12:00 | 21:40:02.62 | -58:06:15.1 | HIP 106797 | 22.43 |
| 2026-05-19 00:00 | 21:40:02.16 | -58:07:00.4 | HIP 106797 | 21.91 |
| 2026-05-19 12:00 | 21:40:01.63 | -58:07:45.7 | HIP 106797 | 21.39 |
| 2026-05-20 00:00 | 21:40:01.04 | -58:08:31.2 | HIP 106797 | 20.87 |
| 2026-05-20 12:00 | 21:40:00.37 | -58:09:16.8 | HIP 106797 | 20.37 |
| 2026-05-21 00:00 | 21:39:59.64 | -58:10:02.5 | HIP 106797 | 19.87 |
| 2026-05-21 12:00 | 21:39:58.85 | -58:10:48.3 | HIP 106797 | 19.38 |
| 2026-05-22 00:00 | 21:39:57.98 | -58:11:34.1 | HIP 106797 | 18.90 |
| 2026-05-22 12:00 | 21:39:57.05 | -58:12:20.1 | HIP 106797 | 18.43 |
| 2026-05-23 00:00 | 21:39:56.06 | -58:13:06.1 | HIP 106797 | 17.98 |
| 2026-05-23 12:00 | 21:39:55.00 | -58:13:52.2 | HIP 106797 | 17.54 |
| 2026-05-24 00:00 | 21:39:53.87 | -58:14:38.4 | HIP 106797 | 17.12 |
| 2026-05-24 12:00 | 21:39:52.67 | -58:15:24.7 | HIP 106797 | 16.71 |
| 2026-05-25 00:00 | 21:39:51.41 | -58:16:11.0 | HIP 106797 | 16.32 |
| 2026-05-25 12:00 | 21:39:50.08 | -58:16:57.4 | HIP 106797 | 15.96 |
| 2026-05-26 00:00 | 21:39:48.68 | -58:17:43.8 | HIP 106797 | 15.61 |
| 2026-05-26 12:00 | 21:39:47.22 | -58:18:30.3 | HIP 106797 | 15.29 |
| 2026-05-27 00:00 | 21:39:45.69 | -58:19:16.8 | HIP 106797 | 15.00 |
| 2026-05-27 12:00 | 21:39:44.10 | -58:20:03.4 | HIP 106797 | 14.74 |
| 2026-05-28 00:00 | 21:39:42.44 | -58:20:50.1 | HIP 106797 | 14.51 |
| 2026-05-28 12:00 | 21:39:40.71 | -58:21:36.7 | HIP 106797 | 14.31 |
| 2026-05-29 00:00 | 21:39:38.92 | -58:22:23.4 | HIP 106797 | 14.15 |
| 2026-05-29 12:00 | 21:39:37.06 | -58:23:10.2 | HIP 106797 | 14.03 |
| 2026-05-30 00:00 | 21:39:35.14 | -58:23:57.0 | HIP 106797 | 13.94 |
| 2026-05-30 12:00 | 21:39:33.15 | -58:24:43.8 | HIP 106797 | 13.90 |
| 2026-05-31 00:00 | 21:39:31.10 | -58:25:30.6 | HIP 106797 | 13.89 |
| 2026-05-31 12:00 | 21:39:28.98 | -58:26:17.5 | HIP 106797 | 13.93 |
| 2026-06-01 00:00 | 21:39:26.79 | -58:27:04.3 | HIP 106797 | 14.01 |
| 2026-06-01 12:00 | 21:39:24.54 | -58:27:51.2 | HIP 106797 | 14.13 |
| 2026-06-02 00:00 | 21:39:22.22 | -58:28:38.1 | HIP 106797 | 14.29 |