| Parameter |
Value |
| Designation |
C/2023 V1 (Lemmon) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2025-07-13T00:46:00.704640Z |
| Orbit solution date (soln_date, UTC) |
2026-07-06T12:12:23Z |
| Obs used |
468 |
| 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) |
2025-04-06.0000000 |
| e |
1.00033960 |
| q (au) |
5.092600 |
| a (au) |
-14996.073952 |
| i (deg) |
102.014031 |
| Ω (om, deg) |
15.039970 |
| ω (w, deg) |
103.313076 |
| M (ma, deg) |
-0.000053 |
Magnitude
Scatter + Global Linear
$$
M_a = (3.946 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
3.946 |
| n |
6.000 |
| gf |
0.800 |
| gb |
-0.500 |
| k |
0.996 |
| δ90 |
1.000 |
| 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 |
13:45:27.89 |
+16:28:08.0 |
HIP 67142 |
21.05 |
| 2026-09-20 12:00 |
13:45:37.18 |
+16:24:08.9 |
HIP 67142 |
24.93 |
| 2026-09-21 00:00 |
13:45:46.51 |
+16:20:10.7 |
HIP 67148 |
22.69 |
| 2026-09-21 12:00 |
13:45:55.90 |
+16:16:13.3 |
HIP 67148 |
19.09 |
| 2026-09-22 00:00 |
13:46:05.34 |
+16:12:16.7 |
HIP 67148 |
16.00 |
| 2026-09-22 12:00 |
13:46:14.83 |
+16:08:21.0 |
HIP 67148 |
13.76 |
| 2026-09-23 00:00 |
13:46:24.37 |
+16:04:26.0 |
HIP 67148 |
12.82 |
| 2026-09-23 12:00 |
13:46:33.96 |
+16:00:31.9 |
HIP 67148 |
13.46 |
| 2026-09-24 00:00 |
13:46:43.60 |
+15:56:38.6 |
HIP 67225 |
11.92 |
| 2026-09-24 12:00 |
13:46:53.29 |
+15:52:46.2 |
HIP 67225 |
9.31 |
| 2026-09-25 00:00 |
13:47:03.02 |
+15:48:54.6 |
HIP 67225 |
8.50 |
| 2026-09-25 12:00 |
13:47:12.79 |
+15:45:03.8 |
HIP 67225 |
9.94 |
| 2026-09-26 00:00 |
13:47:22.61 |
+15:41:13.8 |
HIP 67225 |
12.90 |
| 2026-09-26 12:00 |
13:47:32.48 |
+15:37:24.7 |
HIP 67225 |
16.57 |
| 2026-09-27 00:00 |
13:47:42.38 |
+15:33:36.4 |
HIP 67225 |
20.57 |
| 2026-09-27 12:00 |
13:47:52.33 |
+15:29:49.0 |
HIP 67213 |
24.16 |
| 2026-09-28 00:00 |
13:48:02.32 |
+15:26:02.4 |
HIP 67280 |
22.50 |
| 2026-09-28 12:00 |
13:48:12.35 |
+15:22:16.6 |
HIP 67280 |
20.62 |
| 2026-09-29 00:00 |
13:48:22.42 |
+15:18:31.6 |
HIP 67280 |
19.63 |
| 2026-09-29 12:00 |
13:48:32.53 |
+15:14:47.5 |
HIP 67280 |
19.64 |
| 2026-09-30 00:00 |
13:48:42.68 |
+15:11:04.3 |
HIP 67280 |
20.65 |
| 2026-09-30 12:00 |
13:48:52.86 |
+15:07:21.8 |
HIP 67493 |
20.09 |
| 2026-10-01 00:00 |
13:49:03.08 |
+15:03:40.2 |
HIP 67493 |
15.75 |
| 2026-10-01 12:00 |
13:49:13.34 |
+14:59:59.5 |
HIP 67493 |
11.49 |
| 2026-10-02 00:00 |
13:49:23.63 |
+14:56:19.6 |
HIP 67493 |
7.43 |
| 2026-10-02 12:00 |
13:49:33.95 |
+14:52:40.6 |
HIP 67493 |
4.20 |
| 2026-10-03 00:00 |
13:49:44.31 |
+14:49:02.4 |
HIP 67493 |
4.35 |
| 2026-10-03 12:00 |
13:49:54.70 |
+14:45:25.0 |
HIP 67520 |
3.99 |
| 2026-10-04 00:00 |
13:50:05.12 |
+14:41:48.5 |
HIP 67520 |
6.56 |
| 2026-10-04 12:00 |
13:50:15.58 |
+14:38:12.8 |
HIP 67520 |
10.43 |
| 2026-10-05 00:00 |
13:50:26.06 |
+14:34:38.1 |
HIP 67520 |
14.58 |
| 2026-10-05 12:00 |
13:50:36.57 |
+14:31:04.1 |
HIP 67520 |
18.83 |
| 2026-10-06 00:00 |
13:50:47.11 |
+14:27:31.0 |
HIP 67657 |
16.30 |
| 2026-10-06 12:00 |
13:50:57.68 |
+14:23:58.8 |
HIP 67657 |
12.25 |
| 2026-10-07 00:00 |
13:51:08.27 |
+14:20:27.5 |
HIP 67657 |
8.51 |
| 2026-10-07 12:00 |
13:51:18.89 |
+14:16:57.0 |
HIP 67657 |
5.73 |
| 2026-10-08 00:00 |
13:51:29.53 |
+14:13:27.4 |
HIP 67657 |
5.54 |
| 2026-10-08 12:00 |
13:51:40.20 |
+14:09:58.6 |
HIP 67657 |
8.13 |
| 2026-10-09 00:00 |
13:51:50.89 |
+14:06:30.8 |
HIP 67685 |
5.30 |
| 2026-10-09 12:00 |
13:52:01.60 |
+14:03:03.8 |
HIP 67685 |
1.94 |
| 2026-10-10 00:00 |
13:52:12.33 |
+13:59:37.7 |
HIP 67685 |
4.09 |
| 2026-10-10 12:00 |
13:52:23.09 |
+13:56:12.4 |
HIP 67676 |
7.34 |
| 2026-10-11 00:00 |
13:52:33.86 |
+13:52:48.1 |
HIP 67676 |
10.32 |