C/2023 V1 (Lemmon)
| Parameter |
Value |
| Designation |
C/2023 V1 (Lemmon) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2025-07-13T00:48:09.838080Z |
| Orbit solution date (soln_date, UTC) |
2025-09-23T14:42:07Z |
| Obs used |
382 |
| NEO |
- |
| M1 |
6.700 |
| K1 |
11.750 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2023-11-02T05:36:33.494400Z |
| Discovery magnitude (MPC) |
20.39 G |
| Discovery observatory (MPC) |
I52 · Steward Observatory, Mt. Lemmon Station |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2025-01-03.0000000 |
| e |
1.00025534 |
| q (au) |
5.092601 |
| a (au) |
-19944.690581 |
| i (deg) |
102.013718 |
| Ω (om, deg) |
15.035483 |
| ω (w, deg) |
103.311899 |
| M (ma, deg) |
-0.000067 |
Magnitude
Scatter + Global Linear
$$
M_a = (3.372 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
3.372 |
| n |
6.000 |
| gf |
0.950 |
| gb |
-0.998 |
| k |
1.000 |
| δ90 |
9.955 |
| 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 |
16:00:16.97 |
+32:35:28.4 |
HIP 78576 |
30.75 |
| 2026-02-03 12:00 |
16:00:12.49 |
+32:37:30.6 |
HIP 78576 |
31.90 |
| 2026-02-04 00:00 |
16:00:07.78 |
+32:39:34.2 |
HIP 78576 |
33.21 |
| 2026-02-04 12:00 |
16:00:02.83 |
+32:41:39.0 |
HIP 78205 |
31.30 |
| 2026-02-05 00:00 |
15:59:57.66 |
+32:43:45.0 |
HIP 78205 |
29.13 |
| 2026-02-05 12:00 |
15:59:52.25 |
+32:45:52.3 |
HIP 78205 |
26.94 |
| 2026-02-06 00:00 |
15:59:46.61 |
+32:48:00.8 |
HIP 78205 |
24.74 |
| 2026-02-06 12:00 |
15:59:40.72 |
+32:50:10.4 |
HIP 78205 |
22.54 |
| 2026-02-07 00:00 |
15:59:34.60 |
+32:52:21.3 |
HIP 78205 |
20.35 |
| 2026-02-07 12:00 |
15:59:28.24 |
+32:54:33.3 |
HIP 78205 |
18.20 |
| 2026-02-08 00:00 |
15:59:21.64 |
+32:56:46.4 |
HIP 78205 |
16.12 |
| 2026-02-08 12:00 |
15:59:14.79 |
+32:59:00.7 |
HIP 78205 |
14.16 |
| 2026-02-09 00:00 |
15:59:07.70 |
+33:01:16.1 |
HIP 78205 |
12.42 |
| 2026-02-09 12:00 |
15:59:00.36 |
+33:03:32.5 |
HIP 78205 |
11.02 |
| 2026-02-10 00:00 |
15:58:52.77 |
+33:05:50.0 |
HIP 78205 |
10.15 |
| 2026-02-10 12:00 |
15:58:44.93 |
+33:08:08.6 |
HIP 78205 |
9.97 |
| 2026-02-11 00:00 |
15:58:36.84 |
+33:10:28.2 |
HIP 78205 |
10.57 |
| 2026-02-11 12:00 |
15:58:28.50 |
+33:12:48.8 |
HIP 78205 |
11.85 |
| 2026-02-12 00:00 |
15:58:19.91 |
+33:15:10.3 |
HIP 78205 |
13.65 |
| 2026-02-12 12:00 |
15:58:11.06 |
+33:17:32.8 |
HIP 78205 |
15.83 |
| 2026-02-13 00:00 |
15:58:01.95 |
+33:19:56.3 |
HIP 78205 |
18.26 |
| 2026-02-13 12:00 |
15:57:52.58 |
+33:22:20.7 |
HIP 78205 |
20.88 |
| 2026-02-14 00:00 |
15:57:42.95 |
+33:24:45.9 |
HIP 78205 |
23.65 |
| 2026-02-14 12:00 |
15:57:33.06 |
+33:27:12.1 |
HIP 78205 |
26.53 |
| 2026-02-15 00:00 |
15:57:22.91 |
+33:29:39.0 |
HIP 78205 |
29.50 |
| 2026-02-15 12:00 |
15:57:12.49 |
+33:32:06.8 |
HIP 77991 |
30.32 |
| 2026-02-16 00:00 |
15:57:01.81 |
+33:34:35.4 |
HIP 77991 |
26.99 |
| 2026-02-16 12:00 |
15:56:50.86 |
+33:37:04.7 |
HIP 77991 |
23.62 |
| 2026-02-17 00:00 |
15:56:39.64 |
+33:39:34.8 |
HIP 77991 |
20.20 |
| 2026-02-17 12:00 |
15:56:28.15 |
+33:42:05.6 |
HIP 77991 |
16.73 |
| 2026-02-18 00:00 |
15:56:16.39 |
+33:44:37.1 |
HIP 77991 |
13.21 |
| 2026-02-18 12:00 |
15:56:04.36 |
+33:47:09.3 |
HIP 77991 |
9.66 |
| 2026-02-19 00:00 |
15:55:52.06 |
+33:49:42.1 |
HIP 77991 |
6.06 |
| 2026-02-19 12:00 |
15:55:39.48 |
+33:52:15.5 |
HIP 77991 |
2.45 |
| 2026-02-20 00:00 |
15:55:26.63 |
+33:54:49.5 |
HIP 77991 |
1.46 |
| 2026-02-20 12:00 |
15:55:13.50 |
+33:57:24.0 |
HIP 77991 |
5.12 |
| 2026-02-21 00:00 |
15:55:00.10 |
+33:59:59.0 |
HIP 77991 |
8.90 |
| 2026-02-21 12:00 |
15:54:46.41 |
+34:02:34.6 |
HIP 77991 |
12.74 |
| 2026-02-22 00:00 |
15:54:32.45 |
+34:05:10.6 |
HIP 77991 |
16.63 |
| 2026-02-22 12:00 |
15:54:18.21 |
+34:07:47.0 |
HIP 77933 |
16.09 |
| 2026-02-23 00:00 |
15:54:03.68 |
+34:10:23.9 |
HIP 77933 |
15.80 |
| 2026-02-23 12:00 |
15:53:48.88 |
+34:13:01.1 |
HIP 77933 |
16.53 |
| 2026-02-24 00:00 |
15:53:33.79 |
+34:15:38.6 |
HIP 77933 |
18.21 |