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) |
|---|---|---|---|---|
| 2026-07-29 00:00 | 21:28:52.53 | -59:42:44.2 | HIP 106308 | 22.47 |
| 2026-07-29 12:00 | 21:28:44.73 | -59:43:07.5 | HIP 105976 | 22.53 |
| 2026-07-30 00:00 | 21:28:36.92 | -59:43:30.5 | HIP 105976 | 22.60 |
| 2026-07-30 12:00 | 21:28:29.08 | -59:43:53.1 | HIP 105976 | 22.71 |
| 2026-07-31 00:00 | 21:28:21.23 | -59:44:15.3 | HIP 105976 | 22.86 |
| 2026-07-31 12:00 | 21:28:13.36 | -59:44:37.1 | HIP 105976 | 23.05 |
| 2026-08-01 00:00 | 21:28:05.48 | -59:44:58.5 | HIP 105976 | 23.28 |
| 2026-08-01 12:00 | 21:27:57.58 | -59:45:19.5 | HIP 105976 | 23.56 |
| 2026-08-02 00:00 | 21:27:49.67 | -59:45:40.2 | HIP 105976 | 23.86 |
| 2026-08-02 12:00 | 21:27:41.75 | -59:46:00.4 | HIP 105976 | 24.21 |
| 2026-08-03 00:00 | 21:27:33.81 | -59:46:20.2 | HIP 105976 | 24.59 |
| 2026-08-03 12:00 | 21:27:25.86 | -59:46:39.7 | HIP 105976 | 25.00 |
| 2026-08-04 00:00 | 21:27:17.90 | -59:46:58.7 | HIP 105976 | 25.44 |
| 2026-08-04 12:00 | 21:27:09.93 | -59:47:17.4 | HIP 105976 | 25.91 |
| 2026-08-05 00:00 | 21:27:01.95 | -59:47:35.6 | HIP 105976 | 26.41 |
| 2026-08-05 12:00 | 21:26:53.96 | -59:47:53.5 | HIP 105976 | 26.94 |
| 2026-08-06 00:00 | 21:26:45.96 | -59:48:10.9 | HIP 105976 | 27.49 |
| 2026-08-06 12:00 | 21:26:37.96 | -59:48:27.9 | HIP 105976 | 28.06 |
| 2026-08-07 00:00 | 21:26:29.94 | -59:48:44.5 | HIP 105976 | 28.65 |
| 2026-08-07 12:00 | 21:26:21.92 | -59:49:00.7 | HIP 105976 | 29.27 |
| 2026-08-08 00:00 | 21:26:13.90 | -59:49:16.5 | HIP 105527 | 29.10 |
| 2026-08-08 12:00 | 21:26:05.87 | -59:49:31.9 | HIP 105527 | 28.08 |
| 2026-08-09 00:00 | 21:25:57.83 | -59:49:46.8 | HIP 105527 | 27.05 |
| 2026-08-09 12:00 | 21:25:49.79 | -59:50:01.4 | HIP 105527 | 26.02 |
| 2026-08-10 00:00 | 21:25:41.75 | -59:50:15.5 | HIP 105527 | 25.00 |
| 2026-08-10 12:00 | 21:25:33.70 | -59:50:29.2 | HIP 105527 | 23.97 |
| 2026-08-11 00:00 | 21:25:25.66 | -59:50:42.4 | HIP 105527 | 22.95 |
| 2026-08-11 12:00 | 21:25:17.61 | -59:50:55.3 | HIP 105527 | 21.93 |
| 2026-08-12 00:00 | 21:25:09.56 | -59:51:07.7 | HIP 105527 | 20.91 |
| 2026-08-12 12:00 | 21:25:01.52 | -59:51:19.7 | HIP 105527 | 19.90 |
| 2026-08-13 00:00 | 21:24:53.48 | -59:51:31.3 | HIP 105527 | 18.88 |
| 2026-08-13 12:00 | 21:24:45.43 | -59:51:42.4 | HIP 105527 | 17.87 |
| 2026-08-14 00:00 | 21:24:37.40 | -59:51:53.1 | HIP 105527 | 16.86 |
| 2026-08-14 12:00 | 21:24:29.36 | -59:52:03.4 | HIP 105527 | 15.85 |
| 2026-08-15 00:00 | 21:24:21.33 | -59:52:13.3 | HIP 105527 | 14.85 |
| 2026-08-15 12:00 | 21:24:13.31 | -59:52:22.7 | HIP 105527 | 13.85 |
| 2026-08-16 00:00 | 21:24:05.29 | -59:52:31.7 | HIP 105527 | 12.85 |
| 2026-08-16 12:00 | 21:23:57.28 | -59:52:40.2 | HIP 105527 | 11.85 |
| 2026-08-17 00:00 | 21:23:49.28 | -59:52:48.4 | HIP 105527 | 10.86 |
| 2026-08-17 12:00 | 21:23:41.28 | -59:52:56.0 | HIP 105527 | 9.88 |
| 2026-08-18 00:00 | 21:23:33.30 | -59:53:03.3 | HIP 105527 | 8.90 |
| 2026-08-18 12:00 | 21:23:25.32 | -59:53:10.1 | HIP 105527 | 7.93 |
| 2026-08-19 00:00 | 21:23:17.36 | -59:53:16.5 | HIP 105527 | 6.97 |