349P/Lemmon
| Parameter |
Value |
| Designation |
349P/Lemmon |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2017-08-26T12:49:38.985600Z |
| Orbit solution date (soln_date, UTC) |
2024-06-14T15:42:23Z |
| Obs used |
209 |
| NEO |
- |
| M1 |
10.800 |
| K1 |
17.500 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2019-08-10.0000000 |
| e |
0.29990139 |
| q (au) |
2.499745 |
| a (au) |
3.570561 |
| i (deg) |
5.492271 |
| Ω (om, deg) |
331.761163 |
| ω (w, deg) |
255.998978 |
| M (ma, deg) |
104.225129 |
Magnitude
Scatter + Global Linear
$$
M_a = (15.373 + 3.703\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
15.373 |
| n |
3.703 |
| gf |
0.996 |
| gb |
-0.646 |
| k |
0.914 |
| δ90 |
9.995 |
| 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 |
22:53:52.02 |
-05:31:18.3 |
HIP 113011 |
15.10 |
| 2026-02-03 12:00 |
22:54:23.45 |
-05:27:51.4 |
HIP 113011 |
19.51 |
| 2026-02-04 00:00 |
22:54:54.91 |
-05:24:24.1 |
HIP 113192 |
18.19 |
| 2026-02-04 12:00 |
22:55:26.39 |
-05:20:56.6 |
HIP 113192 |
20.48 |
| 2026-02-05 00:00 |
22:55:57.89 |
-05:17:28.7 |
HIP 113184 |
21.64 |
| 2026-02-05 12:00 |
22:56:29.41 |
-05:14:00.5 |
HIP 113184 |
24.47 |
| 2026-02-06 00:00 |
22:57:00.96 |
-05:10:32.0 |
HIP 113345 |
22.30 |
| 2026-02-06 12:00 |
22:57:32.52 |
-05:07:03.1 |
HIP 113345 |
18.84 |
| 2026-02-07 00:00 |
22:58:04.10 |
-05:03:34.0 |
HIP 113345 |
18.98 |
| 2026-02-07 12:00 |
22:58:35.71 |
-05:00:04.5 |
HIP 113345 |
22.67 |
| 2026-02-08 00:00 |
22:59:07.33 |
-04:56:34.8 |
HIP 113440 |
28.01 |
| 2026-02-08 12:00 |
22:59:38.97 |
-04:53:04.7 |
HIP 113611 |
24.76 |
| 2026-02-09 00:00 |
23:00:10.62 |
-04:49:34.4 |
HIP 113611 |
17.77 |
| 2026-02-09 12:00 |
23:00:42.30 |
-04:46:03.8 |
HIP 113686 |
12.76 |
| 2026-02-10 00:00 |
23:01:13.99 |
-04:42:32.9 |
HIP 113686 |
4.42 |
| 2026-02-10 12:00 |
23:01:45.69 |
-04:39:01.7 |
HIP 113686 |
5.06 |
| 2026-02-11 00:00 |
23:02:17.42 |
-04:35:30.2 |
HIP 113686 |
13.47 |
| 2026-02-11 12:00 |
23:02:49.15 |
-04:31:58.5 |
HIP 113686 |
22.07 |
| 2026-02-12 00:00 |
23:03:20.90 |
-04:28:26.5 |
HIP 113896 |
21.26 |
| 2026-02-12 12:00 |
23:03:52.67 |
-04:24:54.2 |
HIP 113896 |
22.82 |
| 2026-02-13 00:00 |
23:04:24.45 |
-04:21:21.7 |
HIP 113896 |
27.20 |
| 2026-02-13 12:00 |
23:04:56.24 |
-04:17:49.0 |
HIP 114118 |
26.74 |
| 2026-02-14 00:00 |
23:05:28.04 |
-04:14:15.9 |
HIP 114118 |
18.31 |
| 2026-02-14 12:00 |
23:05:59.85 |
-04:10:42.7 |
HIP 114118 |
10.31 |
| 2026-02-15 00:00 |
23:06:31.67 |
-04:07:09.2 |
HIP 114118 |
5.34 |
| 2026-02-15 12:00 |
23:07:03.51 |
-04:03:35.4 |
HIP 114120 |
10.04 |
| 2026-02-16 00:00 |
23:07:35.35 |
-04:00:01.5 |
HIP 114120 |
17.97 |
| 2026-02-16 12:00 |
23:08:07.20 |
-03:56:27.3 |
HIP 114325 |
16.94 |
| 2026-02-17 00:00 |
23:08:39.06 |
-03:52:52.8 |
HIP 114325 |
9.63 |
| 2026-02-17 12:00 |
23:09:10.93 |
-03:49:18.2 |
HIP 114325 |
7.09 |
| 2026-02-18 00:00 |
23:09:42.80 |
-03:45:43.4 |
HIP 114355 |
12.11 |
| 2026-02-18 12:00 |
23:10:14.68 |
-03:42:08.3 |
HIP 114355 |
18.25 |
| 2026-02-19 00:00 |
23:10:46.57 |
-03:38:33.1 |
HIP 114355 |
25.91 |
| 2026-02-19 12:00 |
23:11:18.46 |
-03:34:57.7 |
HIP 114553 |
25.26 |
| 2026-02-20 00:00 |
23:11:50.35 |
-03:31:22.0 |
HIP 114553 |
25.50 |
| 2026-02-20 12:00 |
23:12:22.25 |
-03:27:46.2 |
HIP 114510 |
24.47 |
| 2026-02-21 00:00 |
23:12:54.15 |
-03:24:10.2 |
HIP 114510 |
26.42 |
| 2026-02-21 12:00 |
23:13:26.05 |
-03:20:34.1 |
HIP 114510 |
30.82 |
| 2026-02-22 00:00 |
23:13:57.96 |
-03:16:57.8 |
HIP 114822 |
27.24 |
| 2026-02-22 12:00 |
23:14:29.86 |
-03:13:21.3 |
HIP 114822 |
22.98 |
| 2026-02-23 00:00 |
23:15:01.77 |
-03:09:44.6 |
HIP 114822 |
21.62 |
| 2026-02-23 12:00 |
23:15:33.67 |
-03:06:07.8 |
HIP 114822 |
23.65 |
| 2026-02-24 00:00 |
23:16:05.58 |
-03:02:30.9 |
HIP 115037 |
27.69 |