| 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) |
| 2026-09-20 00:00 |
07:07:34.36 |
-22:20:32.9 |
HIP 34431 |
11.13 |
| 2026-09-20 12:00 |
07:07:36.66 |
-22:23:39.2 |
HIP 34431 |
9.34 |
| 2026-09-21 00:00 |
07:07:38.87 |
-22:26:45.9 |
HIP 34431 |
8.41 |
| 2026-09-21 12:00 |
07:07:40.96 |
-22:29:52.9 |
HIP 34431 |
8.64 |
| 2026-09-22 00:00 |
07:07:42.96 |
-22:33:00.3 |
HIP 34431 |
9.95 |
| 2026-09-22 12:00 |
07:07:44.84 |
-22:36:07.9 |
HIP 34431 |
11.98 |
| 2026-09-23 00:00 |
07:07:46.62 |
-22:39:15.9 |
HIP 34431 |
14.44 |
| 2026-09-23 12:00 |
07:07:48.28 |
-22:42:24.1 |
HIP 34431 |
17.15 |
| 2026-09-24 00:00 |
07:07:49.84 |
-22:45:32.6 |
HIP 34431 |
20.00 |
| 2026-09-24 12:00 |
07:07:51.30 |
-22:48:41.4 |
HIP 34455 |
22.90 |
| 2026-09-25 00:00 |
07:07:52.64 |
-22:51:50.5 |
HIP 34455 |
19.92 |
| 2026-09-25 12:00 |
07:07:53.87 |
-22:54:59.8 |
HIP 34455 |
17.03 |
| 2026-09-26 00:00 |
07:07:54.99 |
-22:58:09.4 |
HIP 34455 |
14.27 |
| 2026-09-26 12:00 |
07:07:56.01 |
-23:01:19.2 |
HIP 34455 |
11.73 |
| 2026-09-27 00:00 |
07:07:56.91 |
-23:04:29.3 |
HIP 34455 |
9.60 |
| 2026-09-27 12:00 |
07:07:57.70 |
-23:07:39.6 |
HIP 34455 |
8.19 |
| 2026-09-28 00:00 |
07:07:58.38 |
-23:10:50.1 |
HIP 34455 |
7.92 |
| 2026-09-28 12:00 |
07:07:58.94 |
-23:14:00.8 |
HIP 34455 |
8.89 |
| 2026-09-29 00:00 |
07:07:59.40 |
-23:17:11.7 |
HIP 34429 |
9.40 |
| 2026-09-29 12:00 |
07:07:59.74 |
-23:20:22.9 |
HIP 34429 |
6.51 |
| 2026-09-30 00:00 |
07:07:59.96 |
-23:23:34.2 |
HIP 34429 |
4.12 |
| 2026-09-30 12:00 |
07:08:00.08 |
-23:26:45.7 |
HIP 34429 |
3.48 |
| 2026-10-01 00:00 |
07:08:00.07 |
-23:29:57.3 |
HIP 34429 |
5.27 |
| 2026-10-01 12:00 |
07:07:59.96 |
-23:33:09.2 |
HIP 34429 |
8.01 |
| 2026-10-02 00:00 |
07:07:59.72 |
-23:36:21.2 |
HIP 34429 |
11.01 |
| 2026-10-02 12:00 |
07:07:59.38 |
-23:39:33.3 |
HIP 34478 |
12.45 |
| 2026-10-03 00:00 |
07:07:58.91 |
-23:42:45.6 |
HIP 34478 |
11.08 |
| 2026-10-03 12:00 |
07:07:58.33 |
-23:45:58.0 |
HIP 34360 |
9.32 |
| 2026-10-04 00:00 |
07:07:57.63 |
-23:49:10.5 |
HIP 34360 |
8.11 |
| 2026-10-04 12:00 |
07:07:56.81 |
-23:52:23.1 |
HIP 34360 |
8.06 |
| 2026-10-05 00:00 |
07:07:55.87 |
-23:55:35.8 |
HIP 34360 |
9.19 |
| 2026-10-05 12:00 |
07:07:54.82 |
-23:58:48.6 |
HIP 34360 |
11.15 |
| 2026-10-06 00:00 |
07:07:53.64 |
-24:02:01.5 |
HIP 34489 |
12.75 |
| 2026-10-06 12:00 |
07:07:52.35 |
-24:05:14.5 |
HIP 34489 |
13.28 |
| 2026-10-07 00:00 |
07:07:50.94 |
-24:08:27.5 |
HIP 34489 |
14.56 |
| 2026-10-07 12:00 |
07:07:49.40 |
-24:11:40.5 |
HIP 34489 |
16.41 |
| 2026-10-08 00:00 |
07:07:47.74 |
-24:14:53.6 |
HIP 34314 |
15.18 |
| 2026-10-08 12:00 |
07:07:45.97 |
-24:18:06.7 |
HIP 34314 |
13.40 |
| 2026-10-09 00:00 |
07:07:44.07 |
-24:21:19.8 |
HIP 34314 |
12.20 |
| 2026-10-09 12:00 |
07:07:42.04 |
-24:24:32.9 |
HIP 34314 |
11.77 |
| 2026-10-10 00:00 |
07:07:39.90 |
-24:27:46.1 |
HIP 34314 |
12.21 |
| 2026-10-10 12:00 |
07:07:37.63 |
-24:30:59.1 |
HIP 34314 |
13.41 |
| 2026-10-11 00:00 |
07:07:35.24 |
-24:34:12.2 |
HIP 34314 |
15.22 |