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 | 2014-12-17 | +8.1822 | -5.233 |
| 2014-12-17 | 2015-05-14 | -1.1668 | -0.020 |
| 2015-05-14 | 2015-06-22 | +7.0841 | -1.117 |
| 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) |
|---|---|---|---|---|
| 2026-02-03 00:00 | 21:22:49.43 | -57:07:49.5 | HIP 105719 | 17.50 |
| 2026-02-03 12:00 | 21:22:57.26 | -57:07:30.1 | HIP 105719 | 16.70 |
| 2026-02-04 00:00 | 21:23:05.08 | -57:07:11.0 | HIP 105719 | 15.94 |
| 2026-02-04 12:00 | 21:23:12.91 | -57:06:52.3 | HIP 105719 | 15.22 |
| 2026-02-05 00:00 | 21:23:20.73 | -57:06:34.0 | HIP 105719 | 14.54 |
| 2026-02-05 12:00 | 21:23:28.56 | -57:06:15.9 | HIP 105719 | 13.91 |
| 2026-02-06 00:00 | 21:23:36.39 | -57:05:58.2 | HIP 105719 | 13.34 |
| 2026-02-06 12:00 | 21:23:44.22 | -57:05:40.9 | HIP 105719 | 12.83 |
| 2026-02-07 00:00 | 21:23:52.04 | -57:05:23.9 | HIP 105719 | 12.39 |
| 2026-02-07 12:00 | 21:23:59.87 | -57:05:07.3 | HIP 105719 | 12.04 |
| 2026-02-08 00:00 | 21:24:07.69 | -57:04:51.0 | HIP 105719 | 11.77 |
| 2026-02-08 12:00 | 21:24:15.51 | -57:04:35.0 | HIP 105719 | 11.59 |
| 2026-02-09 00:00 | 21:24:23.33 | -57:04:19.4 | HIP 105719 | 11.51 |
| 2026-02-09 12:00 | 21:24:31.15 | -57:04:04.2 | HIP 105719 | 11.53 |
| 2026-02-10 00:00 | 21:24:38.96 | -57:03:49.3 | HIP 105719 | 11.64 |
| 2026-02-10 12:00 | 21:24:46.77 | -57:03:34.8 | HIP 105719 | 11.85 |
| 2026-02-11 00:00 | 21:24:54.57 | -57:03:20.6 | HIP 105719 | 12.14 |
| 2026-02-11 12:00 | 21:25:02.37 | -57:03:06.8 | HIP 105719 | 12.51 |
| 2026-02-12 00:00 | 21:25:10.16 | -57:02:53.3 | HIP 105719 | 12.96 |
| 2026-02-12 12:00 | 21:25:17.95 | -57:02:40.2 | HIP 105719 | 13.48 |
| 2026-02-13 00:00 | 21:25:25.73 | -57:02:27.5 | HIP 105719 | 14.05 |
| 2026-02-13 12:00 | 21:25:33.50 | -57:02:15.1 | HIP 105719 | 14.67 |
| 2026-02-14 00:00 | 21:25:41.27 | -57:02:03.1 | HIP 105719 | 15.34 |
| 2026-02-14 12:00 | 21:25:49.02 | -57:01:51.4 | HIP 105719 | 16.05 |
| 2026-02-15 00:00 | 21:25:56.77 | -57:01:40.1 | HIP 105719 | 16.79 |
| 2026-02-15 12:00 | 21:26:04.51 | -57:01:29.2 | HIP 105719 | 17.56 |
| 2026-02-16 00:00 | 21:26:12.24 | -57:01:18.7 | HIP 105719 | 18.35 |
| 2026-02-16 12:00 | 21:26:19.96 | -57:01:08.5 | HIP 105719 | 19.16 |
| 2026-02-17 00:00 | 21:26:27.67 | -57:00:58.7 | HIP 105719 | 19.99 |
| 2026-02-17 12:00 | 21:26:35.37 | -57:00:49.2 | HIP 105719 | 20.84 |
| 2026-02-18 00:00 | 21:26:43.06 | -57:00:40.1 | HIP 105719 | 21.70 |
| 2026-02-18 12:00 | 21:26:50.74 | -57:00:31.4 | HIP 105719 | 22.57 |
| 2026-02-19 00:00 | 21:26:58.40 | -57:00:23.1 | HIP 105719 | 23.45 |
| 2026-02-19 12:00 | 21:27:06.05 | -57:00:15.1 | HIP 105719 | 24.34 |
| 2026-02-20 00:00 | 21:27:13.69 | -57:00:07.5 | HIP 105719 | 25.23 |
| 2026-02-20 12:00 | 21:27:21.31 | -57:00:00.3 | HIP 105719 | 26.13 |
| 2026-02-21 00:00 | 21:27:28.92 | -56:59:53.4 | HIP 105719 | 27.04 |
| 2026-02-21 12:00 | 21:27:36.51 | -56:59:46.9 | HIP 106105 | 26.77 |
| 2026-02-22 00:00 | 21:27:44.09 | -56:59:40.8 | HIP 106105 | 26.25 |
| 2026-02-22 12:00 | 21:27:51.65 | -56:59:35.1 | HIP 106105 | 25.75 |
| 2026-02-23 00:00 | 21:27:59.19 | -56:59:29.7 | HIP 106105 | 25.28 |
| 2026-02-23 12:00 | 21:28:06.72 | -56:59:24.7 | HIP 106237 | 24.53 |
| 2026-02-24 00:00 | 21:28:14.23 | -56:59:20.1 | HIP 106237 | 23.51 |