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) |
|---|---|---|---|---|
| 2026-05-12 00:00 | 17:43:37.52 | +03:36:10.7 | HIP 86820 | 39.87 |
| 2026-05-12 12:00 | 17:43:27.53 | +03:39:26.1 | HIP 86779 | 41.19 |
| 2026-05-13 00:00 | 17:43:17.29 | +03:42:39.6 | HIP 86581 | 37.09 |
| 2026-05-13 12:00 | 17:43:06.77 | +03:45:51.4 | HIP 86581 | 32.96 |
| 2026-05-14 00:00 | 17:42:56.00 | +03:49:01.2 | HIP 86581 | 28.82 |
| 2026-05-14 12:00 | 17:42:44.97 | +03:52:09.1 | HIP 86581 | 24.65 |
| 2026-05-15 00:00 | 17:42:33.68 | +03:55:15.0 | HIP 86581 | 20.46 |
| 2026-05-15 12:00 | 17:42:22.14 | +03:58:19.0 | HIP 86581 | 16.26 |
| 2026-05-16 00:00 | 17:42:10.35 | +04:01:20.9 | HIP 86581 | 12.04 |
| 2026-05-16 12:00 | 17:41:58.32 | +04:04:20.7 | HIP 86581 | 7.80 |
| 2026-05-17 00:00 | 17:41:46.05 | +04:07:18.5 | HIP 86581 | 3.58 |
| 2026-05-17 12:00 | 17:41:33.54 | +04:10:14.1 | HIP 86581 | 1.10 |
| 2026-05-18 00:00 | 17:41:20.79 | +04:13:07.5 | HIP 86581 | 5.14 |
| 2026-05-18 12:00 | 17:41:07.81 | +04:15:58.7 | HIP 86511 | 8.97 |
| 2026-05-19 00:00 | 17:40:54.61 | +04:18:47.7 | HIP 86511 | 10.03 |
| 2026-05-19 12:00 | 17:40:41.18 | +04:21:34.5 | HIP 86511 | 12.55 |
| 2026-05-20 00:00 | 17:40:27.54 | +04:24:18.9 | HIP 86511 | 15.86 |
| 2026-05-20 12:00 | 17:40:13.68 | +04:27:01.0 | HIP 86387 | 16.78 |
| 2026-05-21 00:00 | 17:39:59.60 | +04:29:40.8 | HIP 86387 | 13.27 |
| 2026-05-21 12:00 | 17:39:45.32 | +04:32:18.1 | HIP 86387 | 10.40 |
| 2026-05-22 00:00 | 17:39:30.84 | +04:34:53.1 | HIP 86387 | 8.84 |
| 2026-05-22 12:00 | 17:39:16.16 | +04:37:25.6 | HIP 86387 | 9.30 |
| 2026-05-23 00:00 | 17:39:01.28 | +04:39:55.6 | HIP 86387 | 11.57 |
| 2026-05-23 12:00 | 17:38:46.22 | +04:42:23.2 | HIP 86387 | 14.85 |
| 2026-05-24 00:00 | 17:38:30.96 | +04:44:48.2 | HIP 86316 | 16.10 |
| 2026-05-24 12:00 | 17:38:15.53 | +04:47:10.7 | HIP 86336 | 14.59 |
| 2026-05-25 00:00 | 17:37:59.92 | +04:49:30.7 | HIP 86336 | 13.98 |
| 2026-05-25 12:00 | 17:37:44.13 | +04:51:48.0 | HIP 86336 | 14.86 |
| 2026-05-26 00:00 | 17:37:28.17 | +04:54:02.7 | HIP 86336 | 17.01 |
| 2026-05-26 12:00 | 17:37:12.05 | +04:56:14.8 | HIP 86135 | 16.51 |
| 2026-05-27 00:00 | 17:36:55.77 | +04:58:24.2 | HIP 86135 | 13.86 |
| 2026-05-27 12:00 | 17:36:39.33 | +05:00:31.0 | HIP 86135 | 12.34 |
| 2026-05-28 00:00 | 17:36:22.74 | +05:02:35.0 | HIP 86135 | 12.40 |
| 2026-05-28 12:00 | 17:36:06.00 | +05:04:36.3 | HIP 86084 | 9.06 |
| 2026-05-29 00:00 | 17:35:49.12 | +05:06:34.8 | HIP 86084 | 6.93 |
| 2026-05-29 12:00 | 17:35:32.09 | +05:08:30.6 | HIP 86084 | 7.50 |
| 2026-05-30 00:00 | 17:35:14.94 | +05:10:23.6 | HIP 86084 | 10.36 |
| 2026-05-30 12:00 | 17:34:57.65 | +05:12:13.8 | HIP 86084 | 14.20 |
| 2026-05-31 00:00 | 17:34:40.24 | +05:14:01.1 | HIP 86084 | 18.42 |
| 2026-05-31 12:00 | 17:34:22.70 | +05:15:45.6 | HIP 86084 | 22.81 |
| 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 |