| 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 · 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) |
| 2026-05-12 00:00 |
06:28:13.07 |
-15:33:15.7 |
HIP 30743 |
17.26 |
| 2026-05-12 12:00 |
06:28:21.23 |
-15:32:58.5 |
HIP 30743 |
18.10 |
| 2026-05-13 00:00 |
06:28:29.46 |
-15:32:42.2 |
HIP 30743 |
19.13 |
| 2026-05-13 12:00 |
06:28:37.76 |
-15:32:26.6 |
HIP 30743 |
20.33 |
| 2026-05-14 00:00 |
06:28:46.12 |
-15:32:11.9 |
HIP 30968 |
21.18 |
| 2026-05-14 12:00 |
06:28:54.55 |
-15:31:57.9 |
HIP 30968 |
19.62 |
| 2026-05-15 00:00 |
06:29:03.04 |
-15:31:44.8 |
HIP 30968 |
18.14 |
| 2026-05-15 12:00 |
06:29:11.60 |
-15:31:32.5 |
HIP 30968 |
16.77 |
| 2026-05-16 00:00 |
06:29:20.22 |
-15:31:21.0 |
HIP 30968 |
15.52 |
| 2026-05-16 12:00 |
06:29:28.90 |
-15:31:10.3 |
HIP 30968 |
14.45 |
| 2026-05-17 00:00 |
06:29:37.64 |
-15:31:00.5 |
HIP 30968 |
13.61 |
| 2026-05-17 12:00 |
06:29:46.44 |
-15:30:51.4 |
HIP 30968 |
13.03 |
| 2026-05-18 00:00 |
06:29:55.31 |
-15:30:43.2 |
HIP 30968 |
12.77 |
| 2026-05-18 12:00 |
06:30:04.23 |
-15:30:35.9 |
HIP 30968 |
12.86 |
| 2026-05-19 00:00 |
06:30:13.21 |
-15:30:29.4 |
HIP 30968 |
13.28 |
| 2026-05-19 12:00 |
06:30:22.25 |
-15:30:23.7 |
HIP 30968 |
14.03 |
| 2026-05-20 00:00 |
06:30:31.35 |
-15:30:18.8 |
HIP 30968 |
15.05 |
| 2026-05-20 12:00 |
06:30:40.50 |
-15:30:14.8 |
HIP 30968 |
16.29 |
| 2026-05-21 00:00 |
06:30:49.70 |
-15:30:11.6 |
HIP 30968 |
17.73 |
| 2026-05-21 12:00 |
06:30:58.96 |
-15:30:09.3 |
HIP 30968 |
19.31 |
| 2026-05-22 00:00 |
06:31:08.28 |
-15:30:07.8 |
HIP 30968 |
21.01 |
| 2026-05-22 12:00 |
06:31:17.64 |
-15:30:07.2 |
HIP 30968 |
22.81 |
| 2026-05-23 00:00 |
06:31:27.06 |
-15:30:07.4 |
HIP 30968 |
24.68 |
| 2026-05-23 12:00 |
06:31:36.53 |
-15:30:08.5 |
HIP 31194 |
25.34 |
| 2026-05-24 00:00 |
06:31:46.05 |
-15:30:10.4 |
HIP 31194 |
24.00 |
| 2026-05-24 12:00 |
06:31:55.62 |
-15:30:13.2 |
HIP 31194 |
22.79 |
| 2026-05-25 00:00 |
06:32:05.23 |
-15:30:16.8 |
HIP 31194 |
21.74 |
| 2026-05-25 12:00 |
06:32:14.89 |
-15:30:21.3 |
HIP 31194 |
20.88 |
| 2026-05-26 00:00 |
06:32:24.61 |
-15:30:26.7 |
HIP 31194 |
20.23 |
| 2026-05-26 12:00 |
06:32:34.36 |
-15:30:32.9 |
HIP 31194 |
19.83 |
| 2026-05-27 00:00 |
06:32:44.17 |
-15:30:39.9 |
HIP 31194 |
19.68 |
| 2026-05-27 12:00 |
06:32:54.01 |
-15:30:47.9 |
HIP 31194 |
19.81 |
| 2026-05-28 00:00 |
06:33:03.91 |
-15:30:56.6 |
HIP 31194 |
20.20 |
| 2026-05-28 12:00 |
06:33:13.84 |
-15:31:06.3 |
HIP 31194 |
20.85 |
| 2026-05-29 00:00 |
06:33:23.82 |
-15:31:16.8 |
HIP 31194 |
21.74 |
| 2026-05-29 12:00 |
06:33:33.84 |
-15:31:28.2 |
HIP 31194 |
22.85 |
| 2026-05-30 00:00 |
06:33:43.90 |
-15:31:40.4 |
HIP 31401 |
21.01 |
| 2026-05-30 12:00 |
06:33:54.00 |
-15:31:53.5 |
HIP 31401 |
19.20 |
| 2026-05-31 00:00 |
06:34:04.15 |
-15:32:07.5 |
HIP 31401 |
17.54 |
| 2026-05-31 12:00 |
06:34:14.33 |
-15:32:22.3 |
HIP 31401 |
16.09 |
| 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 |