437P/Lemmon-PANSTARRS
| Parameter |
Value |
| Designation |
437P/Lemmon-PANSTARRS |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2012-11-24T04:41:12.096960Z |
| Orbit solution date (soln_date, UTC) |
2023-01-21T03:13:43Z |
| Obs used |
106 |
| NEO |
- |
| M1 |
7.700 |
| K1 |
20.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2011-10-24T06:09:06.048000Z |
| Discovery magnitude (MPC) |
20.90 V |
| Discovery observatory (MPC) |
G96 · Mt. Lemmon Survey |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2017-09-29.0000000 |
| e |
0.25225853 |
| q (au) |
3.409730 |
| a (au) |
4.560038 |
| i (deg) |
3.690020 |
| Ω (om, deg) |
245.898008 |
| ω (w, deg) |
206.625064 |
| M (ma, deg) |
179.133437 |
Magnitude
Scatter + Global Linear
$$
M_a = (10.237 + 5.762\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
10.237 |
| n |
5.762 |
| gf |
0.993 |
| gb |
-0.976 |
| 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
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
16:28:28.58 |
-22:09:58.0 |
HIP 80587 |
17.65 |
| 2026-02-03 12:00 |
16:28:46.11 |
-22:10:30.3 |
HIP 80587 |
21.74 |
| 2026-02-04 00:00 |
16:29:03.51 |
-22:11:02.2 |
HIP 80810 |
21.28 |
| 2026-02-04 12:00 |
16:29:20.78 |
-22:11:33.7 |
HIP 80810 |
18.31 |
| 2026-02-05 00:00 |
16:29:37.91 |
-22:12:04.8 |
HIP 80810 |
15.84 |
| 2026-02-05 12:00 |
16:29:54.92 |
-22:12:35.5 |
HIP 80810 |
14.10 |
| 2026-02-06 00:00 |
16:30:11.78 |
-22:13:05.7 |
HIP 80810 |
13.36 |
| 2026-02-06 12:00 |
16:30:28.51 |
-22:13:35.6 |
HIP 80810 |
13.74 |
| 2026-02-07 00:00 |
16:30:45.11 |
-22:14:05.0 |
HIP 80810 |
15.14 |
| 2026-02-07 12:00 |
16:31:01.56 |
-22:14:34.1 |
HIP 80810 |
17.28 |
| 2026-02-08 00:00 |
16:31:17.88 |
-22:15:02.7 |
HIP 80810 |
19.92 |
| 2026-02-08 12:00 |
16:31:34.06 |
-22:15:30.9 |
HIP 80810 |
22.86 |
| 2026-02-09 00:00 |
16:31:50.10 |
-22:15:58.7 |
HIP 80810 |
25.99 |
| 2026-02-09 12:00 |
16:32:05.99 |
-22:16:26.1 |
HIP 80810 |
29.24 |
| 2026-02-10 00:00 |
16:32:21.74 |
-22:16:53.1 |
HIP 80810 |
32.55 |
| 2026-02-10 12:00 |
16:32:37.35 |
-22:17:19.7 |
HIP 80937 |
33.73 |
| 2026-02-11 00:00 |
16:32:52.81 |
-22:17:45.9 |
HIP 81169 |
31.69 |
| 2026-02-11 12:00 |
16:33:08.13 |
-22:18:11.6 |
HIP 81169 |
28.67 |
| 2026-02-12 00:00 |
16:33:23.30 |
-22:18:37.0 |
HIP 81169 |
25.82 |
| 2026-02-12 12:00 |
16:33:38.32 |
-22:19:02.0 |
HIP 81169 |
23.19 |
| 2026-02-13 00:00 |
16:33:53.19 |
-22:19:26.5 |
HIP 81169 |
20.84 |
| 2026-02-13 12:00 |
16:34:07.91 |
-22:19:50.7 |
HIP 81169 |
18.85 |
| 2026-02-14 00:00 |
16:34:22.48 |
-22:20:14.4 |
HIP 81169 |
17.34 |
| 2026-02-14 12:00 |
16:34:36.90 |
-22:20:37.7 |
HIP 81169 |
16.40 |
| 2026-02-15 00:00 |
16:34:51.16 |
-22:21:00.7 |
HIP 81169 |
16.12 |
| 2026-02-15 12:00 |
16:35:05.27 |
-22:21:23.2 |
HIP 81169 |
16.51 |
| 2026-02-16 00:00 |
16:35:19.23 |
-22:21:45.3 |
HIP 81169 |
17.51 |
| 2026-02-16 12:00 |
16:35:33.03 |
-22:22:07.0 |
HIP 81169 |
19.00 |
| 2026-02-17 00:00 |
16:35:46.67 |
-22:22:28.3 |
HIP 81169 |
20.85 |
| 2026-02-17 12:00 |
16:36:00.15 |
-22:22:49.3 |
HIP 81169 |
22.97 |
| 2026-02-18 00:00 |
16:36:13.47 |
-22:23:09.8 |
HIP 81169 |
25.28 |
| 2026-02-18 12:00 |
16:36:26.64 |
-22:23:29.9 |
HIP 81413 |
25.95 |
| 2026-02-19 00:00 |
16:36:39.64 |
-22:23:49.6 |
HIP 81413 |
24.41 |
| 2026-02-19 12:00 |
16:36:52.48 |
-22:24:08.9 |
HIP 81413 |
23.17 |
| 2026-02-20 00:00 |
16:37:05.15 |
-22:24:27.8 |
HIP 81413 |
22.28 |
| 2026-02-20 12:00 |
16:37:17.67 |
-22:24:46.3 |
HIP 81413 |
21.76 |
| 2026-02-21 00:00 |
16:37:30.02 |
-22:25:04.4 |
HIP 81413 |
21.61 |
| 2026-02-21 12:00 |
16:37:42.20 |
-22:25:22.1 |
HIP 81413 |
21.84 |
| 2026-02-22 00:00 |
16:37:54.22 |
-22:25:39.4 |
HIP 81413 |
22.42 |
| 2026-02-22 12:00 |
16:38:06.07 |
-22:25:56.4 |
HIP 81413 |
23.30 |
| 2026-02-23 00:00 |
16:38:17.75 |
-22:26:12.9 |
HIP 81413 |
24.44 |
| 2026-02-23 12:00 |
16:38:29.26 |
-22:26:29.0 |
HIP 81513 |
24.90 |
| 2026-02-24 00:00 |
16:38:40.61 |
-22:26:44.8 |
HIP 81513 |
24.53 |