| Parameter |
Value |
| Designation |
C/2024 B2 (Lemmon) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2023-10-06T00:00:41.523840Z |
| Orbit solution date (soln_date, UTC) |
2025-01-02T20:12:33Z |
| Obs used |
92 |
| NEO |
- |
| M1 |
15.400 |
| K1 |
4.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2024-01-31T06:07:50.448000Z |
| Discovery magnitude (MPC) |
20.60 G |
| Discovery observatory (MPC) |
G96 · University of Arizona Mt. Lemmon Survey |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2024-02-17.0000000 |
| e |
0.99929047 |
| q (au) |
4.076491 |
| a (au) |
5745.321334 |
| i (deg) |
99.839185 |
| Ω (om, deg) |
294.378058 |
| ω (w, deg) |
130.312850 |
| M (ma, deg) |
0.000303 |
Magnitude
Scatter + Global Linear
$$
M_a = (18.987 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
18.987 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.840 |
| 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
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-06-01 00:00 |
06:34:24.55 |
-15:32:38.0 |
HIP 31401 |
14.92 |
| 2026-06-01 12:00 |
06:34:34.81 |
-15:32:54.6 |
HIP 31401 |
14.10 |
| 2026-06-02 00:00 |
06:34:45.11 |
-15:33:12.0 |
HIP 31401 |
13.71 |
| 2026-06-02 12:00 |
06:34:55.44 |
-15:33:30.3 |
HIP 31401 |
13.78 |
| 2026-06-03 00:00 |
06:35:05.81 |
-15:33:49.5 |
HIP 31401 |
14.31 |
| 2026-06-03 12:00 |
06:35:16.21 |
-15:34:09.6 |
HIP 31401 |
15.26 |
| 2026-06-04 00:00 |
06:35:26.65 |
-15:34:30.5 |
HIP 31401 |
16.56 |
| 2026-06-04 12:00 |
06:35:37.12 |
-15:34:52.4 |
HIP 31401 |
18.15 |
| 2026-06-05 00:00 |
06:35:47.63 |
-15:35:15.1 |
HIP 31401 |
19.95 |
| 2026-06-05 12:00 |
06:35:58.17 |
-15:35:38.6 |
HIP 31401 |
21.92 |
| 2026-06-06 00:00 |
06:36:08.74 |
-15:36:03.1 |
HIP 31401 |
24.02 |
| 2026-06-06 12:00 |
06:36:19.35 |
-15:36:28.4 |
HIP 31401 |
26.22 |
| 2026-06-07 00:00 |
06:36:29.98 |
-15:36:54.7 |
HIP 31472 |
27.21 |
| 2026-06-07 12:00 |
06:36:40.65 |
-15:37:21.8 |
HIP 31472 |
28.21 |
| 2026-06-08 00:00 |
06:36:51.34 |
-15:37:49.8 |
HIP 31472 |
29.40 |
| 2026-06-08 12:00 |
06:37:02.06 |
-15:38:18.7 |
HIP 31472 |
30.76 |
| 2026-06-09 00:00 |
06:37:12.81 |
-15:38:48.5 |
HIP 31799 |
31.24 |
| 2026-06-09 12:00 |
06:37:23.59 |
-15:39:19.1 |
HIP 31799 |
28.92 |
| 2026-06-10 00:00 |
06:37:34.40 |
-15:39:50.7 |
HIP 31799 |
26.64 |
| 2026-06-10 12:00 |
06:37:45.23 |
-15:40:23.2 |
HIP 31799 |
24.41 |
| 2026-06-11 00:00 |
06:37:56.09 |
-15:40:56.5 |
HIP 31799 |
22.27 |
| 2026-06-11 12:00 |
06:38:06.97 |
-15:41:30.8 |
HIP 31799 |
20.24 |
| 2026-06-12 00:00 |
06:38:17.88 |
-15:42:05.9 |
HIP 31799 |
18.36 |
| 2026-06-12 12:00 |
06:38:28.81 |
-15:42:42.0 |
HIP 31799 |
16.69 |
| 2026-06-13 00:00 |
06:38:39.76 |
-15:43:18.9 |
HIP 31799 |
15.30 |
| 2026-06-13 12:00 |
06:38:50.73 |
-15:43:56.8 |
HIP 31799 |
14.27 |
| 2026-06-14 00:00 |
06:39:01.73 |
-15:44:35.6 |
HIP 31799 |
13.70 |
| 2026-06-14 12:00 |
06:39:12.75 |
-15:45:15.2 |
HIP 31799 |
13.64 |
| 2026-06-15 00:00 |
06:39:23.78 |
-15:45:55.8 |
HIP 31799 |
14.11 |
| 2026-06-15 12:00 |
06:39:34.83 |
-15:46:37.3 |
HIP 31932 |
12.73 |
| 2026-06-16 00:00 |
06:39:45.91 |
-15:47:19.7 |
HIP 31932 |
9.99 |
| 2026-06-16 12:00 |
06:39:57.00 |
-15:48:03.0 |
HIP 31932 |
7.26 |
| 2026-06-17 00:00 |
06:40:08.10 |
-15:48:47.2 |
HIP 31932 |
4.56 |
| 2026-06-17 12:00 |
06:40:19.22 |
-15:49:32.3 |
HIP 31932 |
2.05 |
| 2026-06-18 00:00 |
06:40:30.36 |
-15:50:18.3 |
HIP 31932 |
1.74 |
| 2026-06-18 12:00 |
06:40:41.51 |
-15:51:05.2 |
HIP 31932 |
4.17 |
| 2026-06-19 00:00 |
06:40:52.68 |
-15:51:53.0 |
HIP 31932 |
6.89 |
| 2026-06-19 12:00 |
06:41:03.85 |
-15:52:41.8 |
HIP 31932 |
9.66 |
| 2026-06-20 00:00 |
06:41:15.04 |
-15:53:31.4 |
HIP 31932 |
12.45 |
| 2026-06-20 12:00 |
06:41:26.24 |
-15:54:21.9 |
HIP 32069 |
10.07 |
| 2026-06-21 00:00 |
06:41:37.45 |
-15:55:13.4 |
HIP 32069 |
7.47 |
| 2026-06-21 12:00 |
06:41:48.68 |
-15:56:05.7 |
HIP 32069 |
5.08 |
| 2026-06-22 00:00 |
06:41:59.91 |
-15:56:59.0 |
HIP 32069 |
3.45 |