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) |
|---|---|---|---|---|
| 2026-07-29 00:00 | 17:07:32.34 | +03:11:26.6 | HIP 83836 | 21.15 |
| 2026-07-29 12:00 | 17:07:30.77 | +03:08:14.4 | HIP 83836 | 18.33 |
| 2026-07-30 00:00 | 17:07:29.48 | +03:05:01.1 | HIP 83836 | 15.62 |
| 2026-07-30 12:00 | 17:07:28.48 | +03:01:46.7 | HIP 83836 | 13.10 |
| 2026-07-31 00:00 | 17:07:27.75 | +02:58:31.3 | HIP 83836 | 10.89 |
| 2026-07-31 12:00 | 17:07:27.31 | +02:55:14.9 | HIP 83836 | 9.26 |
| 2026-08-01 00:00 | 17:07:27.15 | +02:51:57.4 | HIP 83836 | 8.55 |
| 2026-08-01 12:00 | 17:07:27.27 | +02:48:38.9 | HIP 83836 | 9.00 |
| 2026-08-02 00:00 | 17:07:27.67 | +02:45:19.5 | HIP 83836 | 10.48 |
| 2026-08-02 12:00 | 17:07:28.36 | +02:41:59.2 | HIP 83836 | 12.64 |
| 2026-08-03 00:00 | 17:07:29.32 | +02:38:38.0 | HIP 83836 | 15.22 |
| 2026-08-03 12:00 | 17:07:30.57 | +02:35:15.8 | HIP 83836 | 18.03 |
| 2026-08-04 00:00 | 17:07:32.10 | +02:31:52.9 | HIP 83836 | 21.01 |
| 2026-08-04 12:00 | 17:07:33.91 | +02:28:29.1 | HIP 83836 | 24.09 |
| 2026-08-05 00:00 | 17:07:36.01 | +02:25:04.5 | HIP 83836 | 27.25 |
| 2026-08-05 12:00 | 17:07:38.38 | +02:21:39.1 | HIP 83836 | 30.47 |
| 2026-08-06 00:00 | 17:07:41.03 | +02:18:13.0 | HIP 83632 | 32.37 |
| 2026-08-06 12:00 | 17:07:43.97 | +02:14:46.1 | HIP 83851 | 32.25 |
| 2026-08-07 00:00 | 17:07:47.19 | +02:11:18.5 | HIP 83851 | 28.70 |
| 2026-08-07 12:00 | 17:07:50.68 | +02:07:50.3 | HIP 83851 | 25.12 |
| 2026-08-08 00:00 | 17:07:54.46 | +02:04:21.3 | HIP 83851 | 21.52 |
| 2026-08-08 12:00 | 17:07:58.52 | +02:00:51.8 | HIP 83851 | 17.91 |
| 2026-08-09 00:00 | 17:08:02.86 | +01:57:21.6 | HIP 83851 | 14.29 |
| 2026-08-09 12:00 | 17:08:07.48 | +01:53:50.9 | HIP 83851 | 10.68 |
| 2026-08-10 00:00 | 17:08:12.38 | +01:50:19.6 | HIP 83851 | 7.17 |
| 2026-08-10 12:00 | 17:08:17.56 | +01:46:47.8 | HIP 83852 | 4.00 |
| 2026-08-11 00:00 | 17:08:23.02 | +01:43:15.4 | HIP 83852 | 3.04 |
| 2026-08-11 12:00 | 17:08:28.75 | +01:39:42.6 | HIP 83852 | 5.65 |
| 2026-08-12 00:00 | 17:08:34.77 | +01:36:09.3 | HIP 83852 | 9.21 |
| 2026-08-12 12:00 | 17:08:41.06 | +01:32:35.6 | HIP 83852 | 12.99 |
| 2026-08-13 00:00 | 17:08:47.63 | +01:29:01.4 | HIP 83852 | 16.87 |
| 2026-08-13 12:00 | 17:08:54.48 | +01:25:26.9 | HIP 83852 | 20.80 |
| 2026-08-14 00:00 | 17:09:01.60 | +01:21:52.1 | HIP 84018 | 24.06 |
| 2026-08-14 12:00 | 17:09:09.00 | +01:18:16.8 | HIP 84018 | 24.21 |
| 2026-08-15 00:00 | 17:09:16.67 | +01:14:41.3 | HIP 84018 | 24.98 |
| 2026-08-15 12:00 | 17:09:24.62 | +01:11:05.5 | HIP 84018 | 26.32 |
| 2026-08-16 00:00 | 17:09:32.84 | +01:07:29.4 | HIP 84018 | 28.17 |
| 2026-08-16 12:00 | 17:09:41.33 | +01:03:53.1 | HIP 84018 | 30.45 |
| 2026-08-17 00:00 | 17:09:50.09 | +01:00:16.6 | HIP 83957 | 27.43 |
| 2026-08-17 12:00 | 17:09:59.13 | +00:56:39.9 | HIP 83957 | 24.10 |
| 2026-08-18 00:00 | 17:10:08.43 | +00:53:03.0 | HIP 83957 | 21.13 |
| 2026-08-18 12:00 | 17:10:18.00 | +00:49:25.9 | HIP 83957 | 18.72 |
| 2026-08-19 00:00 | 17:10:27.83 | +00:45:48.8 | HIP 83957 | 17.12 |