| Parameter |
Value |
| Designation |
C/2023 X2 (Lemmon) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2025-12-27T19:22:52.052160Z |
| Orbit solution date (soln_date, UTC) |
2026-03-31T09:42:18Z |
| Obs used |
537 |
| 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 · Mt. Lemmon Survey |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2025-02-03.0000000 |
| e |
1.00060251 |
| q (au) |
5.089784 |
| a (au) |
-8447.621444 |
| i (deg) |
76.989176 |
| Ω (om, deg) |
66.307848 |
| ω (w, deg) |
64.720349 |
| M (ma, deg) |
-0.000416 |
Magnitude
Scatter + Global Linear
$$
M_a = (8.388 + 5.140\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
8.388 |
| n |
5.140 |
| gf |
1.000 |
| gb |
-0.749 |
| 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) |
| 2026-03-26 00:00 |
21:40:04.26 |
+83:20:13.9 |
HIP 107325 |
17.26 |
| 2026-03-26 12:00 |
21:40:22.34 |
+83:23:18.7 |
HIP 107325 |
19.87 |
| 2026-03-27 00:00 |
21:40:39.59 |
+83:26:25.5 |
HIP 107325 |
22.66 |
| 2026-03-27 12:00 |
21:40:55.96 |
+83:29:34.3 |
HIP 107325 |
25.57 |
| 2026-03-28 00:00 |
21:41:11.45 |
+83:32:45.0 |
HIP 108363 |
27.23 |
| 2026-03-28 12:00 |
21:41:26.01 |
+83:35:57.7 |
HIP 107334 |
26.77 |
| 2026-03-29 00:00 |
21:41:39.63 |
+83:39:12.3 |
HIP 107334 |
23.51 |
| 2026-03-29 12:00 |
21:41:52.28 |
+83:42:28.8 |
HIP 107334 |
20.23 |
| 2026-03-30 00:00 |
21:42:03.93 |
+83:45:47.1 |
HIP 107334 |
16.93 |
| 2026-03-30 12:00 |
21:42:14.55 |
+83:49:07.4 |
HIP 107334 |
13.61 |
| 2026-03-31 00:00 |
21:42:24.11 |
+83:52:29.6 |
HIP 107334 |
10.30 |
| 2026-03-31 12:00 |
21:42:32.57 |
+83:55:53.5 |
HIP 107334 |
7.03 |
| 2026-04-01 00:00 |
21:42:39.89 |
+83:59:19.4 |
HIP 107334 |
4.01 |
| 2026-04-01 12:00 |
21:42:46.05 |
+84:02:47.0 |
HIP 107334 |
2.54 |
| 2026-04-02 00:00 |
21:42:50.99 |
+84:06:16.4 |
HIP 107334 |
4.61 |
| 2026-04-02 12:00 |
21:42:54.69 |
+84:09:47.7 |
HIP 107334 |
7.82 |
| 2026-04-03 00:00 |
21:42:57.08 |
+84:13:20.6 |
HIP 107038 |
7.45 |
| 2026-04-03 12:00 |
21:42:58.13 |
+84:16:55.4 |
HIP 107038 |
4.55 |
| 2026-04-04 00:00 |
21:42:57.79 |
+84:20:31.9 |
HIP 107038 |
3.37 |
| 2026-04-04 12:00 |
21:42:56.01 |
+84:24:10.0 |
HIP 107038 |
5.30 |
| 2026-04-05 00:00 |
21:42:52.72 |
+84:27:49.9 |
HIP 107038 |
8.45 |
| 2026-04-05 12:00 |
21:42:47.87 |
+84:31:31.5 |
HIP 107038 |
11.92 |
| 2026-04-06 00:00 |
21:42:41.41 |
+84:35:14.7 |
HIP 107038 |
15.51 |
| 2026-04-06 12:00 |
21:42:33.25 |
+84:38:59.5 |
HIP 107982 |
17.24 |
| 2026-04-07 00:00 |
21:42:23.34 |
+84:42:45.9 |
HIP 107982 |
15.39 |
| 2026-04-07 12:00 |
21:42:11.60 |
+84:46:34.0 |
HIP 107982 |
14.35 |
| 2026-04-08 00:00 |
21:41:57.95 |
+84:50:23.6 |
HIP 107982 |
14.31 |
| 2026-04-08 12:00 |
21:41:42.32 |
+84:54:14.7 |
HIP 107982 |
15.32 |
| 2026-04-09 00:00 |
21:41:24.60 |
+84:58:07.3 |
HIP 107982 |
17.20 |
| 2026-04-09 12:00 |
21:41:04.71 |
+85:02:01.4 |
HIP 107982 |
19.73 |
| 2026-04-10 00:00 |
21:40:42.55 |
+85:05:56.9 |
HIP 107982 |
22.71 |
| 2026-04-10 12:00 |
21:40:18.01 |
+85:09:53.8 |
HIP 107982 |
25.99 |
| 2026-04-11 00:00 |
21:39:50.99 |
+85:13:52.1 |
HIP 107982 |
29.48 |
| 2026-04-11 12:00 |
21:39:21.35 |
+85:17:51.8 |
HIP 107982 |
33.13 |
| 2026-04-12 00:00 |
21:38:48.98 |
+85:21:52.8 |
HIP 109169 |
33.85 |
| 2026-04-12 12:00 |
21:38:13.74 |
+85:25:55.0 |
HIP 109169 |
34.23 |
| 2026-04-13 00:00 |
21:37:35.48 |
+85:29:58.4 |
HIP 104503 |
33.28 |
| 2026-04-13 12:00 |
21:36:54.04 |
+85:34:03.0 |
HIP 104503 |
31.26 |
| 2026-04-14 00:00 |
21:36:09.27 |
+85:38:08.8 |
HIP 104503 |
29.64 |
| 2026-04-14 12:00 |
21:35:20.98 |
+85:42:15.6 |
HIP 104503 |
28.50 |
| 2026-04-15 00:00 |
21:34:28.99 |
+85:46:23.4 |
HIP 104503 |
27.93 |
| 2026-04-15 12:00 |
21:33:33.09 |
+85:50:32.2 |
HIP 104503 |
27.97 |
| 2026-04-16 00:00 |
21:32:33.07 |
+85:54:41.8 |
HIP 104503 |
28.62 |