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) |
|---|---|---|---|---|
| 2026-06-01 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 |
| 2026-06-02 12:00 | 21:39:19.84 | -58:29:25.0 | HIP 106797 | 14.49 |
| 2026-06-03 00:00 | 21:39:17.39 | -58:30:11.9 | HIP 106797 | 14.73 |
| 2026-06-03 12:00 | 21:39:14.88 | -58:30:58.8 | HIP 106797 | 15.01 |
| 2026-06-04 00:00 | 21:39:12.30 | -58:31:45.7 | HIP 106797 | 15.32 |
| 2026-06-04 12:00 | 21:39:09.66 | -58:32:32.5 | HIP 106797 | 15.67 |
| 2026-06-05 00:00 | 21:39:06.95 | -58:33:19.4 | HIP 106797 | 16.05 |
| 2026-06-05 12:00 | 21:39:04.18 | -58:34:06.3 | HIP 106797 | 16.46 |
| 2026-06-06 00:00 | 21:39:01.34 | -58:34:53.1 | HIP 106797 | 16.90 |
| 2026-06-06 12:00 | 21:38:58.44 | -58:35:39.9 | HIP 106797 | 17.37 |
| 2026-06-07 00:00 | 21:38:55.47 | -58:36:26.7 | HIP 106797 | 17.87 |
| 2026-06-07 12:00 | 21:38:52.44 | -58:37:13.4 | HIP 106797 | 18.38 |
| 2026-06-08 00:00 | 21:38:49.35 | -58:38:00.1 | HIP 106797 | 18.93 |
| 2026-06-08 12:00 | 21:38:46.19 | -58:38:46.8 | HIP 106797 | 19.49 |
| 2026-06-09 00:00 | 21:38:42.97 | -58:39:33.5 | HIP 106797 | 20.07 |
| 2026-06-09 12:00 | 21:38:39.68 | -58:40:20.0 | HIP 106904 | 20.49 |
| 2026-06-10 00:00 | 21:38:36.33 | -58:41:06.6 | HIP 106904 | 19.80 |
| 2026-06-10 12:00 | 21:38:32.92 | -58:41:53.1 | HIP 106904 | 19.13 |
| 2026-06-11 00:00 | 21:38:29.44 | -58:42:39.5 | HIP 106904 | 18.48 |
| 2026-06-11 12:00 | 21:38:25.90 | -58:43:25.8 | HIP 106904 | 17.85 |
| 2026-06-12 00:00 | 21:38:22.30 | -58:44:12.1 | HIP 106904 | 17.25 |
| 2026-06-12 12:00 | 21:38:18.63 | -58:44:58.4 | HIP 106904 | 16.69 |
| 2026-06-13 00:00 | 21:38:14.90 | -58:45:44.5 | HIP 106904 | 16.15 |
| 2026-06-13 12:00 | 21:38:11.11 | -58:46:30.6 | HIP 106904 | 15.66 |
| 2026-06-14 00:00 | 21:38:07.26 | -58:47:16.6 | HIP 106904 | 15.21 |
| 2026-06-14 12:00 | 21:38:03.35 | -58:48:02.5 | HIP 106904 | 14.81 |
| 2026-06-15 00:00 | 21:37:59.37 | -58:48:48.3 | HIP 106904 | 14.46 |
| 2026-06-15 12:00 | 21:37:55.33 | -58:49:34.0 | HIP 106904 | 14.17 |
| 2026-06-16 00:00 | 21:37:51.23 | -58:50:19.6 | HIP 106904 | 13.94 |
| 2026-06-16 12:00 | 21:37:47.07 | -58:51:05.1 | HIP 106904 | 13.78 |
| 2026-06-17 00:00 | 21:37:42.85 | -58:51:50.5 | HIP 106904 | 13.68 |
| 2026-06-17 12:00 | 21:37:38.57 | -58:52:35.8 | HIP 106904 | 13.66 |
| 2026-06-18 00:00 | 21:37:34.23 | -58:53:20.9 | HIP 106904 | 13.70 |
| 2026-06-18 12:00 | 21:37:29.83 | -58:54:06.0 | HIP 106904 | 13.82 |
| 2026-06-19 00:00 | 21:37:25.37 | -58:54:50.9 | HIP 106904 | 14.00 |
| 2026-06-19 12:00 | 21:37:20.85 | -58:55:35.7 | HIP 106904 | 14.26 |
| 2026-06-20 00:00 | 21:37:16.27 | -58:56:20.4 | HIP 106904 | 14.58 |
| 2026-06-20 12:00 | 21:37:11.64 | -58:57:04.9 | HIP 106904 | 14.96 |
| 2026-06-21 00:00 | 21:37:06.94 | -58:57:49.3 | HIP 106904 | 15.39 |
| 2026-06-21 12:00 | 21:37:02.19 | -58:58:33.5 | HIP 106904 | 15.88 |
| 2026-06-22 00:00 | 21:36:57.39 | -58:59:17.6 | HIP 106904 | 16.42 |