| Parameter |
Value |
| Designation |
505P/Palomar |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2017-09-27T02:30:29.422080Z |
| Orbit solution date (soln_date, UTC) |
2025-08-01T17:26:05Z |
| Obs used |
84 |
| NEO |
- |
| M1 |
16.800 |
| K1 |
5.250 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2009-05-27T04:54:45.216000Z |
| Discovery magnitude (MPC) |
19.60 r |
| Discovery observatory (MPC) |
I41 · Palomar Mountain–ZTF |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2014-09-06.0000000 |
| e |
0.31923792 |
| q (au) |
2.775295 |
| a (au) |
4.076748 |
| i (deg) |
11.483482 |
| Ω (om, deg) |
112.299648 |
| ω (w, deg) |
144.977424 |
| M (ma, deg) |
226.239740 |
Magnitude
Scatter + Global Linear
$$
M_a = (10.961 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
10.961 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.501 |
| k |
1.000 |
| 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
Finding Chart
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-06-01 00:00 |
20:19:52.58 |
-18:12:30.6 |
HIP 100334 |
14.81 |
| 2026-06-01 12:00 |
20:19:54.29 |
-18:14:00.4 |
HIP 100334 |
14.81 |
| 2026-06-02 00:00 |
20:19:55.67 |
-18:15:31.9 |
HIP 100334 |
15.06 |
| 2026-06-02 12:00 |
20:19:56.70 |
-18:17:05.0 |
HIP 100348 |
15.49 |
| 2026-06-03 00:00 |
20:19:57.39 |
-18:18:39.7 |
HIP 100348 |
15.17 |
| 2026-06-03 12:00 |
20:19:57.75 |
-18:20:16.0 |
HIP 100348 |
15.09 |
| 2026-06-04 00:00 |
20:19:57.76 |
-18:21:53.9 |
HIP 100348 |
15.26 |
| 2026-06-04 12:00 |
20:19:57.44 |
-18:23:33.5 |
HIP 100348 |
15.69 |
| 2026-06-05 00:00 |
20:19:56.77 |
-18:25:14.6 |
HIP 100348 |
16.36 |
| 2026-06-05 12:00 |
20:19:55.77 |
-18:26:57.4 |
HIP 100348 |
17.26 |
| 2026-06-06 00:00 |
20:19:54.42 |
-18:28:41.7 |
HIP 100348 |
18.36 |
| 2026-06-06 12:00 |
20:19:52.73 |
-18:30:27.7 |
HIP 100348 |
19.63 |
| 2026-06-07 00:00 |
20:19:50.71 |
-18:32:15.2 |
HIP 100348 |
21.07 |
| 2026-06-07 12:00 |
20:19:48.35 |
-18:34:04.4 |
HIP 100348 |
22.65 |
| 2026-06-08 00:00 |
20:19:45.64 |
-18:35:55.1 |
HIP 100348 |
24.35 |
| 2026-06-08 12:00 |
20:19:42.60 |
-18:37:47.4 |
HIP 100348 |
26.16 |
| 2026-06-09 00:00 |
20:19:39.22 |
-18:39:41.3 |
HIP 100195 |
27.67 |
| 2026-06-09 12:00 |
20:19:35.51 |
-18:41:36.8 |
HIP 100195 |
25.65 |
| 2026-06-10 00:00 |
20:19:31.46 |
-18:43:33.8 |
HIP 100195 |
23.62 |
| 2026-06-10 12:00 |
20:19:27.07 |
-18:45:32.4 |
HIP 100195 |
21.59 |
| 2026-06-11 00:00 |
20:19:22.35 |
-18:47:32.5 |
HIP 100195 |
19.57 |
| 2026-06-11 12:00 |
20:19:17.29 |
-18:49:34.2 |
HIP 100195 |
17.60 |
| 2026-06-12 00:00 |
20:19:11.90 |
-18:51:37.4 |
HIP 100195 |
15.73 |
| 2026-06-12 12:00 |
20:19:06.18 |
-18:53:42.1 |
HIP 100195 |
14.03 |
| 2026-06-13 00:00 |
20:19:00.13 |
-18:55:48.3 |
HIP 100195 |
12.59 |
| 2026-06-13 12:00 |
20:18:53.75 |
-18:57:55.9 |
HIP 100195 |
11.58 |
| 2026-06-14 00:00 |
20:18:47.04 |
-19:00:05.1 |
HIP 100195 |
11.13 |
| 2026-06-14 12:00 |
20:18:40.01 |
-19:02:15.8 |
HIP 100195 |
11.38 |
| 2026-06-15 00:00 |
20:18:32.66 |
-19:04:27.8 |
HIP 100195 |
12.32 |
| 2026-06-15 12:00 |
20:18:24.98 |
-19:06:41.4 |
HIP 100107 |
10.82 |
| 2026-06-16 00:00 |
20:18:16.98 |
-19:08:56.3 |
HIP 100107 |
8.97 |
| 2026-06-16 12:00 |
20:18:08.67 |
-19:11:12.7 |
HIP 100107 |
7.83 |
| 2026-06-17 00:00 |
20:18:00.04 |
-19:13:30.4 |
HIP 100107 |
7.81 |
| 2026-06-17 12:00 |
20:17:51.10 |
-19:15:49.5 |
HIP 100107 |
8.99 |
| 2026-06-18 00:00 |
20:17:41.85 |
-19:18:09.9 |
HIP 100107 |
11.04 |
| 2026-06-18 12:00 |
20:17:32.30 |
-19:20:31.7 |
HIP 100107 |
13.62 |
| 2026-06-19 00:00 |
20:17:22.43 |
-19:22:54.8 |
HIP 100107 |
16.52 |
| 2026-06-19 12:00 |
20:17:12.27 |
-19:25:19.1 |
HIP 100107 |
19.63 |
| 2026-06-20 00:00 |
20:17:01.81 |
-19:27:44.7 |
HIP 100107 |
22.89 |
| 2026-06-20 12:00 |
20:16:51.05 |
-19:30:11.6 |
HIP 100107 |
26.27 |
| 2026-06-21 00:00 |
20:16:40.00 |
-19:32:39.7 |
HIP 100000 |
26.36 |
| 2026-06-21 12:00 |
20:16:28.66 |
-19:35:09.0 |
HIP 100000 |
25.07 |
| 2026-06-22 00:00 |
20:16:17.03 |
-19:37:39.5 |
HIP 100000 |
24.29 |