469P/PANSTARRS
Metadata
| Parameter | Value |
|---|---|
| Designation | 469P/PANSTARRS |
| Type | P |
| Perihelion (tp_cal, UTC) | 2016-12-03T09:46:16.360320Z |
| Orbit solution date (soln_date, UTC) | 2025-01-02T20:13:05Z |
| Obs used | 80 |
| NEO | - |
| M1 | 14.800 |
| K1 | 6.750 |
| PC | - |
| Discovery observation (MPC, UTC) | 2015-12-13T15:11:15.648000Z |
| Discovery magnitude (MPC) | 22.40 w |
| Discovery observatory (MPC) | F51 · Pan-STARRS 1, Haleakala |
Osculating Elements
| Parameter | Value |
|---|---|
| Epoch (epoch_cal, TDB) | 2015-07-09.0000000 |
| e | 0.31155930 |
| q (au) | 2.984245 |
| a (au) | 4.334789 |
| i (deg) | 20.165485 |
| Ω (om, deg) | 179.032083 |
| ω (w, deg) | 43.960303 |
| M (ma, deg) | 303.932135 |
Magnitude
Scatter + Global Linear
$$ M_a = (12.553 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
Model Parameters
| Parameter | Value |
|---|---|
| H0 | 12.553 |
| n | 6.000 |
| gf | 1.000 |
| gb | -0.649 |
| k | 0.800 |
| δ90 | 10.000 |
| 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 |
|---|---|---|---|
| 2015-12-13 | 2016-08-15 | +29.8074 | -15.634 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Finding Chart
Ephemeris
| Date/Time (UTC) | RA (J2000) | Dec (J2000) | Nearest HIP | Dist from HIP (arcmin) |
|---|---|---|---|---|
| 2026-06-01 00:00 | 17:34:05.05 | +05:17:27.3 | HIP 85911 | 26.86 |
| 2026-06-01 12:00 | 17:33:47.29 | +05:19:06.0 | HIP 85911 | 23.82 |
| 2026-06-02 00:00 | 17:33:29.42 | +05:20:41.8 | HIP 85911 | 21.43 |
| 2026-06-02 12:00 | 17:33:11.45 | +05:22:14.7 | HIP 85911 | 19.95 |
| 2026-06-03 00:00 | 17:32:53.38 | +05:23:44.7 | HIP 85911 | 19.59 |
| 2026-06-03 12:00 | 17:32:35.22 | +05:25:11.7 | HIP 85911 | 20.42 |
| 2026-06-04 00:00 | 17:32:16.97 | +05:26:35.8 | HIP 85911 | 22.29 |
| 2026-06-04 12:00 | 17:31:58.63 | +05:27:56.8 | HIP 85665 | 24.39 |
| 2026-06-05 00:00 | 17:31:40.22 | +05:29:14.9 | HIP 85665 | 19.64 |
| 2026-06-05 12:00 | 17:31:21.73 | +05:30:29.9 | HIP 85665 | 14.89 |
| 2026-06-06 00:00 | 17:31:03.18 | +05:31:41.9 | HIP 85665 | 10.15 |
| 2026-06-06 12:00 | 17:30:44.56 | +05:32:50.9 | HIP 85665 | 5.44 |
| 2026-06-07 00:00 | 17:30:25.88 | +05:33:56.8 | HIP 85665 | 1.27 |
| 2026-06-07 12:00 | 17:30:07.14 | +05:34:59.7 | HIP 85665 | 4.38 |
| 2026-06-08 00:00 | 17:29:48.36 | +05:35:59.4 | HIP 85625 | 5.59 |
| 2026-06-08 12:00 | 17:29:29.54 | +05:36:56.1 | HIP 85625 | 8.07 |
| 2026-06-09 00:00 | 17:29:10.67 | +05:37:49.7 | HIP 85625 | 12.01 |
| 2026-06-09 12:00 | 17:28:51.77 | +05:38:40.2 | HIP 85625 | 16.38 |
| 2026-06-10 00:00 | 17:28:32.84 | +05:39:27.5 | HIP 85625 | 20.91 |
| 2026-06-10 12:00 | 17:28:13.89 | +05:40:11.7 | HIP 85625 | 25.52 |
| 2026-06-11 00:00 | 17:27:54.92 | +05:40:52.8 | HIP 85625 | 30.16 |
| 2026-06-11 12:00 | 17:27:35.94 | +05:41:30.7 | HIP 85625 | 34.82 |
| 2026-06-12 00:00 | 17:27:16.95 | +05:42:05.5 | HIP 85564 | 38.77 |
| 2026-06-12 12:00 | 17:26:57.96 | +05:42:37.1 | HIP 85248 | 37.39 |
| 2026-06-13 00:00 | 17:26:38.97 | +05:43:05.6 | HIP 85248 | 34.59 |
| 2026-06-13 12:00 | 17:26:19.99 | +05:43:30.9 | HIP 85248 | 32.22 |
| 2026-06-14 00:00 | 17:26:01.03 | +05:43:53.1 | HIP 85248 | 30.36 |
| 2026-06-14 12:00 | 17:25:42.08 | +05:44:12.0 | HIP 85248 | 29.10 |
| 2026-06-15 00:00 | 17:25:23.16 | +05:44:27.8 | HIP 85248 | 28.53 |
| 2026-06-15 12:00 | 17:25:04.27 | +05:44:40.5 | HIP 85248 | 28.68 |
| 2026-06-16 00:00 | 17:24:45.42 | +05:44:50.0 | HIP 85248 | 29.53 |
| 2026-06-16 12:00 | 17:24:26.61 | +05:44:56.3 | HIP 85248 | 31.03 |
| 2026-06-17 00:00 | 17:24:07.84 | +05:44:59.5 | HIP 85248 | 33.07 |
| 2026-06-17 12:00 | 17:23:49.13 | +05:44:59.5 | HIP 85248 | 35.56 |
| 2026-06-18 00:00 | 17:23:30.48 | +05:44:56.4 | HIP 84983 | 37.92 |
| 2026-06-18 12:00 | 17:23:11.89 | +05:44:50.1 | HIP 84983 | 35.58 |
| 2026-06-19 00:00 | 17:22:53.36 | +05:44:40.7 | HIP 84983 | 33.67 |
| 2026-06-19 12:00 | 17:22:34.92 | +05:44:28.3 | HIP 84983 | 32.26 |
| 2026-06-20 00:00 | 17:22:16.54 | +05:44:12.7 | HIP 84983 | 31.42 |
| 2026-06-20 12:00 | 17:21:58.26 | +05:43:54.0 | HIP 84983 | 31.18 |
| 2026-06-21 00:00 | 17:21:40.06 | +05:43:32.2 | HIP 84812 | 26.97 |
| 2026-06-21 12:00 | 17:21:21.95 | +05:43:07.4 | HIP 84812 | 22.80 |
| 2026-06-22 00:00 | 17:21:03.94 | +05:42:39.5 | HIP 84812 | 18.78 |