505P/Palomar
| 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) |
| 2026-02-03 00:00 |
18:14:07.44 |
-18:31:17.2 |
HIP 89470 |
21.46 |
| 2026-02-03 12:00 |
18:14:58.08 |
-18:31:35.1 |
HIP 89470 |
11.21 |
| 2026-02-04 00:00 |
18:15:48.65 |
-18:31:52.1 |
HIP 89529 |
6.72 |
| 2026-02-04 12:00 |
18:16:39.14 |
-18:32:08.0 |
HIP 89529 |
9.11 |
| 2026-02-05 00:00 |
18:17:29.56 |
-18:32:22.9 |
HIP 89630 |
4.58 |
| 2026-02-05 12:00 |
18:18:19.90 |
-18:32:36.9 |
HIP 89630 |
13.09 |
| 2026-02-06 00:00 |
18:19:10.17 |
-18:32:49.9 |
HIP 89736 |
23.17 |
| 2026-02-06 12:00 |
18:20:00.37 |
-18:33:01.9 |
HIP 89968 |
26.97 |
| 2026-02-07 00:00 |
18:20:50.48 |
-18:33:13.0 |
HIP 89968 |
19.93 |
| 2026-02-07 12:00 |
18:21:40.52 |
-18:33:23.1 |
HIP 89968 |
18.68 |
| 2026-02-08 00:00 |
18:22:30.47 |
-18:33:32.2 |
HIP 90110 |
11.57 |
| 2026-02-08 12:00 |
18:23:20.35 |
-18:33:40.4 |
HIP 90110 |
0.86 |
| 2026-02-09 00:00 |
18:24:10.14 |
-18:33:47.6 |
HIP 90257 |
11.88 |
| 2026-02-09 12:00 |
18:24:59.86 |
-18:33:54.0 |
HIP 90257 |
1.58 |
| 2026-02-10 00:00 |
18:25:49.48 |
-18:33:59.4 |
HIP 90257 |
11.88 |
| 2026-02-10 12:00 |
18:26:39.03 |
-18:34:03.8 |
HIP 90257 |
23.56 |
| 2026-02-11 00:00 |
18:27:28.48 |
-18:34:07.4 |
HIP 90577 |
21.23 |
| 2026-02-11 12:00 |
18:28:17.85 |
-18:34:10.1 |
HIP 90577 |
9.62 |
| 2026-02-12 00:00 |
18:29:07.13 |
-18:34:11.9 |
HIP 90577 |
2.78 |
| 2026-02-12 12:00 |
18:29:56.32 |
-18:34:12.7 |
HIP 90619 |
9.16 |
| 2026-02-13 00:00 |
18:30:45.42 |
-18:34:12.7 |
HIP 90687 |
12.39 |
| 2026-02-13 12:00 |
18:31:34.43 |
-18:34:11.9 |
HIP 90806 |
10.22 |
| 2026-02-14 00:00 |
18:32:23.35 |
-18:34:10.1 |
HIP 90950 |
16.39 |
| 2026-02-14 12:00 |
18:33:12.17 |
-18:34:07.5 |
HIP 90950 |
12.03 |
| 2026-02-15 00:00 |
18:34:00.90 |
-18:34:04.1 |
HIP 90950 |
16.98 |
| 2026-02-15 12:00 |
18:34:49.53 |
-18:33:59.8 |
HIP 91143 |
11.23 |
| 2026-02-16 00:00 |
18:35:38.06 |
-18:33:54.7 |
HIP 91143 |
0.93 |
| 2026-02-16 12:00 |
18:36:26.50 |
-18:33:48.8 |
HIP 91143 |
11.81 |
| 2026-02-17 00:00 |
18:37:14.83 |
-18:33:42.0 |
HIP 91143 |
23.25 |
| 2026-02-17 12:00 |
18:38:03.06 |
-18:33:34.5 |
HIP 91486 |
21.50 |
| 2026-02-18 00:00 |
18:38:51.19 |
-18:33:26.2 |
HIP 91486 |
11.35 |
| 2026-02-18 12:00 |
18:39:39.22 |
-18:33:17.0 |
HIP 91486 |
7.45 |
| 2026-02-19 00:00 |
18:40:27.15 |
-18:33:07.1 |
HIP 91486 |
15.52 |
| 2026-02-19 12:00 |
18:41:14.96 |
-18:32:56.4 |
HIP 91486 |
26.14 |
| 2026-02-20 00:00 |
18:42:02.67 |
-18:32:45.0 |
HIP 91806 |
28.09 |
| 2026-02-20 12:00 |
18:42:50.28 |
-18:32:32.8 |
HIP 91806 |
23.42 |
| 2026-02-21 00:00 |
18:43:37.77 |
-18:32:19.9 |
HIP 91806 |
23.71 |
| 2026-02-21 12:00 |
18:44:25.16 |
-18:32:06.3 |
HIP 92066 |
23.27 |
| 2026-02-22 00:00 |
18:45:12.43 |
-18:31:51.9 |
HIP 92066 |
13.93 |
| 2026-02-22 12:00 |
18:45:59.59 |
-18:31:36.9 |
HIP 92066 |
9.89 |
| 2026-02-23 00:00 |
18:46:46.64 |
-18:31:21.1 |
HIP 92066 |
15.84 |
| 2026-02-23 12:00 |
18:47:33.58 |
-18:31:04.6 |
HIP 92301 |
17.74 |
| 2026-02-24 00:00 |
18:48:20.40 |
-18:30:47.5 |
HIP 92301 |
7.94 |