| Parameter |
Value |
| Designation |
C/2023 X2 (Lemmon) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2025-12-27T22:04:15.876480Z |
| Orbit solution date (soln_date, UTC) |
2026-05-28T12:12:15Z |
| Obs used |
572 |
| NEO |
- |
| M1 |
7.300 |
| K1 |
10.250 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2023-12-04T08:26:50.467200Z |
| Discovery magnitude (MPC) |
19.74 G |
| Discovery observatory (MPC) |
G96 · University of Arizona Mt. Lemmon Survey |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2025-03-05.0000000 |
| e |
1.00044951 |
| q (au) |
5.089439 |
| a (au) |
-11322.080331 |
| i (deg) |
76.987223 |
| Ω (om, deg) |
66.306730 |
| ω (w, deg) |
64.733940 |
| M (ma, deg) |
-0.000244 |
Magnitude
Scatter + Global Linear
$$
M_a = (8.680 + 5.086\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
8.680 |
| n |
5.086 |
| gf |
1.000 |
| gb |
-0.763 |
| 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) |
| 2026-06-01 00:00 |
13:25:30.13 |
+84:35:13.2 |
HIP 64861 |
13.37 |
| 2026-06-01 12:00 |
13:24:42.05 |
+84:28:45.0 |
HIP 64861 |
17.29 |
| 2026-06-02 00:00 |
13:23:57.10 |
+84:22:15.1 |
HIP 64861 |
22.53 |
| 2026-06-02 12:00 |
13:23:15.11 |
+84:15:43.5 |
HIP 64901 |
23.17 |
| 2026-06-03 00:00 |
13:22:35.94 |
+84:09:10.2 |
HIP 64901 |
16.74 |
| 2026-06-03 12:00 |
13:21:59.44 |
+84:02:35.3 |
HIP 64901 |
10.56 |
| 2026-06-04 00:00 |
13:21:25.49 |
+83:55:58.8 |
HIP 64901 |
5.60 |
| 2026-06-04 12:00 |
13:20:53.97 |
+83:49:20.8 |
HIP 64901 |
6.38 |
| 2026-06-05 00:00 |
13:20:24.75 |
+83:42:41.3 |
HIP 64901 |
11.84 |
| 2026-06-05 12:00 |
13:19:57.74 |
+83:36:00.2 |
HIP 65357 |
10.37 |
| 2026-06-06 00:00 |
13:19:32.83 |
+83:29:17.8 |
HIP 65357 |
7.24 |
| 2026-06-06 12:00 |
13:19:09.92 |
+83:22:33.9 |
HIP 65357 |
9.38 |
| 2026-06-07 00:00 |
13:18:48.92 |
+83:15:48.6 |
HIP 65429 |
10.57 |
| 2026-06-07 12:00 |
13:18:29.76 |
+83:09:01.9 |
HIP 65429 |
14.42 |
| 2026-06-08 00:00 |
13:18:12.34 |
+83:02:14.0 |
HIP 65429 |
19.91 |
| 2026-06-08 12:00 |
13:17:56.60 |
+82:55:24.7 |
HIP 65429 |
26.04 |
| 2026-06-09 00:00 |
13:17:42.47 |
+82:48:34.1 |
HIP 65429 |
32.46 |
| 2026-06-09 12:00 |
13:17:29.87 |
+82:41:42.3 |
HIP 64641 |
36.19 |
| 2026-06-10 00:00 |
13:17:18.74 |
+82:34:49.3 |
HIP 64641 |
29.34 |
| 2026-06-10 12:00 |
13:17:09.02 |
+82:27:55.0 |
HIP 64641 |
22.49 |
| 2026-06-11 00:00 |
13:17:00.66 |
+82:20:59.5 |
HIP 64641 |
15.69 |
| 2026-06-11 12:00 |
13:16:53.60 |
+82:14:02.9 |
HIP 64641 |
9.10 |
| 2026-06-12 00:00 |
13:16:47.79 |
+82:07:05.2 |
HIP 64641 |
4.01 |
| 2026-06-12 12:00 |
13:16:43.18 |
+82:00:06.3 |
HIP 64641 |
6.84 |
| 2026-06-13 00:00 |
13:16:39.73 |
+81:53:06.3 |
HIP 64641 |
13.26 |
| 2026-06-13 12:00 |
13:16:37.39 |
+81:46:05.2 |
HIP 64641 |
20.10 |
| 2026-06-14 00:00 |
13:16:36.12 |
+81:39:03.1 |
HIP 64641 |
27.05 |
| 2026-06-14 12:00 |
13:16:35.88 |
+81:32:00.0 |
HIP 65672 |
30.07 |
| 2026-06-15 00:00 |
13:16:36.63 |
+81:24:55.7 |
HIP 65672 |
27.09 |
| 2026-06-15 12:00 |
13:16:38.34 |
+81:17:50.5 |
HIP 65672 |
25.73 |
| 2026-06-16 00:00 |
13:16:40.96 |
+81:10:44.4 |
HIP 63885 |
25.62 |
| 2026-06-16 12:00 |
13:16:44.48 |
+81:03:37.2 |
HIP 63885 |
27.13 |
| 2026-06-17 00:00 |
13:16:48.86 |
+80:56:29.2 |
HIP 65064 |
20.68 |
| 2026-06-17 12:00 |
13:16:54.05 |
+80:49:20.2 |
HIP 65064 |
14.29 |
| 2026-06-18 00:00 |
13:17:00.05 |
+80:42:10.3 |
HIP 65064 |
9.08 |
| 2026-06-18 12:00 |
13:17:06.82 |
+80:34:59.5 |
HIP 65064 |
7.93 |
| 2026-06-19 00:00 |
13:17:14.32 |
+80:27:47.8 |
HIP 64437 |
11.97 |
| 2026-06-19 12:00 |
13:17:22.55 |
+80:20:35.3 |
HIP 64437 |
14.57 |
| 2026-06-20 00:00 |
13:17:31.46 |
+80:13:22.0 |
HIP 64437 |
19.67 |
| 2026-06-20 12:00 |
13:17:41.05 |
+80:06:07.8 |
HIP 64437 |
25.84 |
| 2026-06-21 00:00 |
13:17:51.27 |
+79:58:52.8 |
HIP 64440 |
24.36 |
| 2026-06-21 12:00 |
13:18:02.13 |
+79:51:37.1 |
HIP 64440 |
19.39 |
| 2026-06-22 00:00 |
13:18:13.58 |
+79:44:20.6 |
HIP 64440 |
16.29 |