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) |
|---|---|---|---|---|
| 2026-09-20 00:00 | 17:29:17.38 | -02:57:26.2 | HIP 85449 | 25.41 |
| 2026-09-20 12:00 | 17:29:41.99 | -03:00:37.6 | HIP 85722 | 22.87 |
| 2026-09-21 00:00 | 17:30:06.78 | -03:03:48.1 | HIP 85722 | 19.83 |
| 2026-09-21 12:00 | 17:30:31.76 | -03:06:57.9 | HIP 85722 | 18.96 |
| 2026-09-22 00:00 | 17:30:56.92 | -03:10:06.8 | HIP 85722 | 20.55 |
| 2026-09-22 12:00 | 17:31:22.26 | -03:13:14.8 | HIP 85722 | 24.17 |
| 2026-09-23 00:00 | 17:31:47.78 | -03:16:22.1 | HIP 85917 | 26.57 |
| 2026-09-23 12:00 | 17:32:13.47 | -03:19:28.5 | HIP 85917 | 19.47 |
| 2026-09-24 00:00 | 17:32:39.35 | -03:22:34.0 | HIP 85917 | 12.36 |
| 2026-09-24 12:00 | 17:33:05.40 | -03:25:38.6 | HIP 85917 | 5.35 |
| 2026-09-25 00:00 | 17:33:31.63 | -03:28:42.4 | HIP 85917 | 2.82 |
| 2026-09-25 12:00 | 17:33:58.02 | -03:31:45.3 | HIP 85917 | 9.60 |
| 2026-09-26 00:00 | 17:34:24.59 | -03:34:47.3 | HIP 85917 | 16.82 |
| 2026-09-26 12:00 | 17:34:51.34 | -03:37:48.4 | HIP 85917 | 24.11 |
| 2026-09-27 00:00 | 17:35:18.25 | -03:40:48.7 | HIP 85917 | 31.44 |
| 2026-09-27 12:00 | 17:35:45.32 | -03:43:48.0 | HIP 86111 | 27.32 |
| 2026-09-28 00:00 | 17:36:12.57 | -03:46:46.4 | HIP 86111 | 24.75 |
| 2026-09-28 12:00 | 17:36:39.98 | -03:49:43.8 | HIP 86111 | 24.29 |
| 2026-09-29 00:00 | 17:37:07.55 | -03:52:40.4 | HIP 86111 | 26.09 |
| 2026-09-29 12:00 | 17:37:35.29 | -03:55:36.0 | HIP 86111 | 29.76 |
| 2026-09-30 00:00 | 17:38:03.19 | -03:58:30.7 | HIP 86111 | 34.73 |
| 2026-09-30 12:00 | 17:38:31.26 | -04:01:24.4 | HIP 86341 | 37.15 |
| 2026-10-01 00:00 | 17:38:59.48 | -04:04:17.2 | HIP 86341 | 34.70 |
| 2026-10-01 12:00 | 17:39:27.86 | -04:07:09.0 | HIP 86341 | 33.84 |
| 2026-10-02 00:00 | 17:39:56.40 | -04:09:59.9 | HIP 86341 | 34.71 |
| 2026-10-02 12:00 | 17:40:25.10 | -04:12:49.8 | HIP 86341 | 37.22 |
| 2026-10-03 00:00 | 17:40:53.95 | -04:15:38.7 | HIP 86678 | 36.88 |
| 2026-10-03 12:00 | 17:41:22.96 | -04:18:26.6 | HIP 86678 | 34.64 |
| 2026-10-04 00:00 | 17:41:52.13 | -04:21:13.6 | HIP 86677 | 31.63 |
| 2026-10-04 12:00 | 17:42:21.45 | -04:23:59.5 | HIP 86789 | 27.19 |
| 2026-10-05 00:00 | 17:42:50.92 | -04:26:44.5 | HIP 86789 | 19.34 |
| 2026-10-05 12:00 | 17:43:20.54 | -04:29:28.4 | HIP 86789 | 11.47 |
| 2026-10-06 00:00 | 17:43:50.31 | -04:32:11.3 | HIP 86789 | 3.57 |
| 2026-10-06 12:00 | 17:44:20.23 | -04:34:53.2 | HIP 86789 | 4.36 |
| 2026-10-07 00:00 | 17:44:50.30 | -04:37:34.0 | HIP 86789 | 12.32 |
| 2026-10-07 12:00 | 17:45:20.51 | -04:40:13.9 | HIP 86897 | 17.28 |
| 2026-10-08 00:00 | 17:45:50.87 | -04:42:52.6 | HIP 86897 | 16.57 |
| 2026-10-08 12:00 | 17:46:21.38 | -04:45:30.4 | HIP 86897 | 19.51 |
| 2026-10-09 00:00 | 17:46:52.03 | -04:48:07.0 | HIP 86897 | 24.86 |
| 2026-10-09 12:00 | 17:47:22.82 | -04:50:42.6 | HIP 86897 | 31.43 |
| 2026-10-10 00:00 | 17:47:53.76 | -04:53:17.1 | HIP 86897 | 38.62 |
| 2026-10-10 12:00 | 17:48:24.83 | -04:55:50.6 | HIP 87338 | 42.44 |
| 2026-10-11 00:00 | 17:48:56.05 | -04:58:22.9 | HIP 87338 | 34.66 |