| Parameter |
Value |
| Designation |
507P/Lemmon |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2022-12-06T12:07:02.400960Z |
| Orbit solution date (soln_date, UTC) |
2025-08-01T17:26:05Z |
| Obs used |
99 |
| NEO |
- |
| M1 |
15.800 |
| K1 |
4.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2007-09-25T06:37:46.272000Z |
| Discovery magnitude (MPC) |
20.60 V |
| Discovery observatory (MPC) |
G96 · University of Arizona Mt. Lemmon Survey |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2019-04-20.0000000 |
| e |
0.56799400 |
| q (au) |
2.717068 |
| a (au) |
6.289421 |
| i (deg) |
17.095414 |
| Ω (om, deg) |
233.426223 |
| ω (w, deg) |
108.747547 |
| M (ma, deg) |
277.110996 |
Magnitude
Scatter + Global Linear
$$
M_a = (18.505 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
18.505 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.756 |
| 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
Finding Chart
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
08:08:57.49 |
+05:34:20.1 |
HIP 39848 |
14.40 |
| 2026-07-29 12:00 |
08:09:14.05 |
+05:33:15.3 |
HIP 39848 |
16.14 |
| 2026-07-30 00:00 |
08:09:30.60 |
+05:32:10.1 |
HIP 39848 |
18.69 |
| 2026-07-30 12:00 |
08:09:47.13 |
+05:31:04.5 |
HIP 40004 |
15.91 |
| 2026-07-31 00:00 |
08:10:03.64 |
+05:29:58.6 |
HIP 40004 |
13.71 |
| 2026-07-31 12:00 |
08:10:20.14 |
+05:28:52.2 |
HIP 40004 |
12.60 |
| 2026-08-01 00:00 |
08:10:36.61 |
+05:27:45.4 |
HIP 40004 |
12.87 |
| 2026-08-01 12:00 |
08:10:53.07 |
+05:26:38.2 |
HIP 40004 |
14.43 |
| 2026-08-02 00:00 |
08:11:09.51 |
+05:25:30.7 |
HIP 40004 |
16.93 |
| 2026-08-02 12:00 |
08:11:25.92 |
+05:24:22.7 |
HIP 40004 |
20.02 |
| 2026-08-03 00:00 |
08:11:42.32 |
+05:23:14.4 |
HIP 40004 |
23.47 |
| 2026-08-03 12:00 |
08:11:58.70 |
+05:22:05.6 |
HIP 40004 |
27.13 |
| 2026-08-04 00:00 |
08:12:15.05 |
+05:20:56.5 |
HIP 40247 |
25.37 |
| 2026-08-04 12:00 |
08:12:31.39 |
+05:19:47.0 |
HIP 40247 |
22.26 |
| 2026-08-05 00:00 |
08:12:47.70 |
+05:18:37.2 |
HIP 40247 |
19.57 |
| 2026-08-05 12:00 |
08:13:03.99 |
+05:17:26.9 |
HIP 40247 |
17.49 |
| 2026-08-06 00:00 |
08:13:20.25 |
+05:16:16.3 |
HIP 40247 |
16.26 |
| 2026-08-06 12:00 |
08:13:36.49 |
+05:15:05.3 |
HIP 40247 |
16.06 |
| 2026-08-07 00:00 |
08:13:52.71 |
+05:13:54.0 |
HIP 40247 |
16.94 |
| 2026-08-07 12:00 |
08:14:08.89 |
+05:12:42.2 |
HIP 40247 |
18.73 |
| 2026-08-08 00:00 |
08:14:25.06 |
+05:11:30.1 |
HIP 40247 |
21.21 |
| 2026-08-08 12:00 |
08:14:41.20 |
+05:10:17.6 |
HIP 40247 |
24.16 |
| 2026-08-09 00:00 |
08:14:57.30 |
+05:09:04.8 |
HIP 40425 |
24.61 |
| 2026-08-09 12:00 |
08:15:13.39 |
+05:07:51.6 |
HIP 40425 |
25.41 |
| 2026-08-10 00:00 |
08:15:29.44 |
+05:06:38.1 |
HIP 40425 |
26.85 |
| 2026-08-10 12:00 |
08:15:45.46 |
+05:05:24.2 |
HIP 40425 |
28.83 |
| 2026-08-11 00:00 |
08:16:01.46 |
+05:04:09.9 |
HIP 40425 |
31.25 |
| 2026-08-11 12:00 |
08:16:17.42 |
+05:02:55.3 |
HIP 40684 |
30.90 |
| 2026-08-12 00:00 |
08:16:33.35 |
+05:01:40.4 |
HIP 40684 |
27.03 |
| 2026-08-12 12:00 |
08:16:49.25 |
+05:00:25.1 |
HIP 40684 |
23.28 |
| 2026-08-13 00:00 |
08:17:05.12 |
+04:59:09.5 |
HIP 40684 |
19.71 |
| 2026-08-13 12:00 |
08:17:20.96 |
+04:57:53.5 |
HIP 40684 |
16.41 |
| 2026-08-14 00:00 |
08:17:36.76 |
+04:56:37.2 |
HIP 40684 |
13.59 |
| 2026-08-14 12:00 |
08:17:52.52 |
+04:55:20.6 |
HIP 40684 |
11.60 |
| 2026-08-15 00:00 |
08:18:08.26 |
+04:54:03.6 |
HIP 40684 |
10.89 |
| 2026-08-15 12:00 |
08:18:23.95 |
+04:52:46.3 |
HIP 40684 |
11.70 |
| 2026-08-16 00:00 |
08:18:39.61 |
+04:51:28.7 |
HIP 40684 |
13.75 |
| 2026-08-16 12:00 |
08:18:55.23 |
+04:50:10.8 |
HIP 40820 |
15.33 |
| 2026-08-17 00:00 |
08:19:10.82 |
+04:48:52.6 |
HIP 40820 |
11.24 |
| 2026-08-17 12:00 |
08:19:26.37 |
+04:47:34.0 |
HIP 40820 |
7.17 |
| 2026-08-18 00:00 |
08:19:41.87 |
+04:46:15.2 |
HIP 40820 |
3.14 |
| 2026-08-18 12:00 |
08:19:57.34 |
+04:44:56.0 |
HIP 40820 |
1.26 |
| 2026-08-19 00:00 |
08:20:12.77 |
+04:43:36.5 |
HIP 40820 |
5.14 |