C/2024 B2 (Lemmon)
| 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
Finding Chart
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
06:37:35.64 |
-18:31:58.3 |
HIP 31700 |
18.22 |
| 2026-02-03 12:00 |
06:37:19.47 |
-18:31:31.3 |
HIP 31564 |
15.66 |
| 2026-02-04 00:00 |
06:37:03.42 |
-18:31:03.2 |
HIP 31564 |
12.86 |
| 2026-02-04 12:00 |
06:36:47.50 |
-18:30:33.9 |
HIP 31564 |
10.75 |
| 2026-02-05 00:00 |
06:36:31.69 |
-18:30:03.6 |
HIP 31564 |
9.76 |
| 2026-02-05 12:00 |
06:36:16.01 |
-18:29:32.1 |
HIP 31560 |
10.18 |
| 2026-02-06 00:00 |
06:36:00.46 |
-18:28:59.5 |
HIP 31560 |
11.76 |
| 2026-02-06 12:00 |
06:35:45.03 |
-18:28:25.9 |
HIP 31560 |
14.16 |
| 2026-02-07 00:00 |
06:35:29.73 |
-18:27:51.2 |
HIP 31560 |
17.03 |
| 2026-02-07 12:00 |
06:35:14.55 |
-18:27:15.4 |
HIP 31560 |
20.15 |
| 2026-02-08 00:00 |
06:34:59.51 |
-18:26:38.6 |
HIP 31355 |
23.09 |
| 2026-02-08 12:00 |
06:34:44.59 |
-18:26:00.7 |
HIP 31355 |
22.94 |
| 2026-02-09 00:00 |
06:34:29.81 |
-18:25:21.9 |
HIP 31355 |
23.37 |
| 2026-02-09 12:00 |
06:34:15.15 |
-18:24:42.0 |
HIP 31262 |
23.57 |
| 2026-02-10 00:00 |
06:34:00.63 |
-18:24:01.2 |
HIP 31262 |
21.35 |
| 2026-02-10 12:00 |
06:33:46.25 |
-18:23:19.4 |
HIP 31262 |
19.50 |
| 2026-02-11 00:00 |
06:33:31.99 |
-18:22:36.7 |
HIP 31262 |
18.13 |
| 2026-02-11 12:00 |
06:33:17.88 |
-18:21:53.0 |
HIP 31262 |
17.33 |
| 2026-02-12 00:00 |
06:33:03.90 |
-18:21:08.4 |
HIP 31262 |
17.17 |
| 2026-02-12 12:00 |
06:32:50.06 |
-18:20:22.8 |
HIP 31262 |
17.65 |
| 2026-02-13 00:00 |
06:32:36.35 |
-18:19:36.4 |
HIP 31131 |
18.58 |
| 2026-02-13 12:00 |
06:32:22.79 |
-18:18:49.1 |
HIP 31131 |
16.40 |
| 2026-02-14 00:00 |
06:32:09.36 |
-18:18:00.9 |
HIP 31131 |
14.64 |
| 2026-02-14 12:00 |
06:31:56.08 |
-18:17:11.9 |
HIP 31131 |
13.46 |
| 2026-02-15 00:00 |
06:31:42.94 |
-18:16:22.1 |
HIP 31131 |
12.99 |
| 2026-02-15 12:00 |
06:31:29.94 |
-18:15:31.4 |
HIP 31131 |
13.28 |
| 2026-02-16 00:00 |
06:31:17.08 |
-18:14:39.9 |
HIP 31131 |
14.26 |
| 2026-02-16 12:00 |
06:31:04.37 |
-18:13:47.6 |
HIP 31131 |
15.80 |
| 2026-02-17 00:00 |
06:30:51.80 |
-18:12:54.6 |
HIP 31131 |
17.73 |
| 2026-02-17 12:00 |
06:30:39.37 |
-18:12:00.8 |
HIP 31030 |
16.72 |
| 2026-02-18 00:00 |
06:30:27.09 |
-18:11:06.3 |
HIP 31030 |
16.09 |
| 2026-02-18 12:00 |
06:30:14.96 |
-18:10:11.0 |
HIP 31030 |
16.00 |
| 2026-02-19 00:00 |
06:30:02.97 |
-18:09:15.0 |
HIP 31030 |
16.45 |
| 2026-02-19 12:00 |
06:29:51.13 |
-18:08:18.4 |
HIP 31030 |
17.38 |
| 2026-02-20 00:00 |
06:29:39.44 |
-18:07:21.0 |
HIP 31030 |
18.71 |
| 2026-02-20 12:00 |
06:29:27.89 |
-18:06:23.0 |
HIP 30918 |
17.67 |
| 2026-02-21 00:00 |
06:29:16.50 |
-18:05:24.4 |
HIP 30918 |
16.66 |
| 2026-02-21 12:00 |
06:29:05.25 |
-18:04:25.1 |
HIP 30918 |
16.09 |
| 2026-02-22 00:00 |
06:28:54.15 |
-18:03:25.2 |
HIP 30918 |
16.00 |
| 2026-02-22 12:00 |
06:28:43.20 |
-18:02:24.8 |
HIP 30918 |
16.37 |
| 2026-02-23 00:00 |
06:28:32.40 |
-18:01:23.7 |
HIP 30918 |
17.16 |
| 2026-02-23 12:00 |
06:28:21.76 |
-18:00:22.1 |
HIP 30918 |
18.30 |
| 2026-02-24 00:00 |
06:28:11.26 |
-17:59:19.9 |
HIP 30681 |
19.22 |