| Parameter |
Value |
| Designation |
C/2025 O2 (MAPS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2025-05-23T16:42:19.152000Z |
| Orbit solution date (soln_date, UTC) |
2025-09-22T13:42:18Z |
| Obs used |
88 |
| NEO |
- |
| M1 |
7.400 |
| K1 |
27.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2025-07-25T09:35:29.760000Z |
| Discovery magnitude (MPC) |
18.80 G |
| Discovery observatory (MPC) |
W94 · MAPS, San Pedro de Atacama |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2025-08-14.0000000 |
| e |
0.99886564 |
| q (au) |
2.288532 |
| a (au) |
2017.460252 |
| i (deg) |
134.542008 |
| Ω (om, deg) |
332.313059 |
| ω (w, deg) |
280.240987 |
| M (ma, deg) |
0.000895 |
Magnitude
Scatter + Global Linear
$$
M_a = (11.254 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
11.254 |
| n |
6.000 |
| gf |
0.998 |
| gb |
-0.500 |
| k |
1.000 |
| 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) |
| 2026-07-29 00:00 |
21:34:21.35 |
-00:30:29.2 |
HIP 106385 |
32.15 |
| 2026-07-29 12:00 |
21:33:43.08 |
-00:31:02.0 |
HIP 106385 |
25.72 |
| 2026-07-30 00:00 |
21:33:04.77 |
-00:31:36.0 |
HIP 106324 |
18.73 |
| 2026-07-30 12:00 |
21:32:26.43 |
-00:32:11.0 |
HIP 106324 |
11.99 |
| 2026-07-31 00:00 |
21:31:48.06 |
-00:32:47.0 |
HIP 106324 |
10.98 |
| 2026-07-31 12:00 |
21:31:09.67 |
-00:33:24.2 |
HIP 106324 |
16.79 |
| 2026-08-01 00:00 |
21:30:31.26 |
-00:34:02.4 |
HIP 106324 |
25.07 |
| 2026-08-01 12:00 |
21:29:52.83 |
-00:34:41.6 |
HIP 105983 |
30.60 |
| 2026-08-02 00:00 |
21:29:14.39 |
-00:35:21.9 |
HIP 105983 |
21.48 |
| 2026-08-02 12:00 |
21:28:35.95 |
-00:36:03.2 |
HIP 105983 |
13.11 |
| 2026-08-03 00:00 |
21:27:57.50 |
-00:36:45.5 |
HIP 105983 |
8.29 |
| 2026-08-03 12:00 |
21:27:19.06 |
-00:37:28.8 |
HIP 105983 |
12.31 |
| 2026-08-04 00:00 |
21:26:40.62 |
-00:38:13.1 |
HIP 105983 |
20.50 |
| 2026-08-04 12:00 |
21:26:02.19 |
-00:38:58.4 |
HIP 105797 |
21.38 |
| 2026-08-05 00:00 |
21:25:23.77 |
-00:39:44.7 |
HIP 105797 |
19.52 |
| 2026-08-05 12:00 |
21:24:45.38 |
-00:40:31.9 |
HIP 105797 |
22.13 |
| 2026-08-06 00:00 |
21:24:07.00 |
-00:41:20.0 |
HIP 105588 |
15.01 |
| 2026-08-06 12:00 |
21:23:28.65 |
-00:42:09.1 |
HIP 105588 |
6.21 |
| 2026-08-07 00:00 |
21:22:50.34 |
-00:42:59.1 |
HIP 105588 |
6.06 |
| 2026-08-07 12:00 |
21:22:12.06 |
-00:43:50.0 |
HIP 105588 |
14.81 |
| 2026-08-08 00:00 |
21:21:33.82 |
-00:44:41.8 |
HIP 105549 |
22.85 |
| 2026-08-08 12:00 |
21:20:55.62 |
-00:45:34.4 |
HIP 105261 |
27.24 |
| 2026-08-09 00:00 |
21:20:17.48 |
-00:46:28.0 |
HIP 105261 |
19.80 |
| 2026-08-09 12:00 |
21:19:39.38 |
-00:47:22.3 |
HIP 105261 |
15.04 |
| 2026-08-10 00:00 |
21:19:01.35 |
-00:48:17.5 |
HIP 105261 |
15.61 |
| 2026-08-10 12:00 |
21:18:23.37 |
-00:49:13.6 |
HIP 105261 |
21.06 |
| 2026-08-11 00:00 |
21:17:45.46 |
-00:50:10.4 |
HIP 105066 |
18.09 |
| 2026-08-11 12:00 |
21:17:07.62 |
-00:51:08.0 |
HIP 105066 |
13.58 |
| 2026-08-12 00:00 |
21:16:29.86 |
-00:52:06.4 |
HIP 105040 |
14.85 |
| 2026-08-12 12:00 |
21:15:52.17 |
-00:53:05.6 |
HIP 104878 |
18.05 |
| 2026-08-13 00:00 |
21:15:14.57 |
-00:54:05.5 |
HIP 104878 |
9.35 |
| 2026-08-13 12:00 |
21:14:37.06 |
-00:55:06.1 |
HIP 104878 |
5.28 |
| 2026-08-14 00:00 |
21:13:59.64 |
-00:56:07.4 |
HIP 104878 |
12.08 |
| 2026-08-14 12:00 |
21:13:22.31 |
-00:57:09.5 |
HIP 104740 |
11.19 |
| 2026-08-15 00:00 |
21:12:45.08 |
-00:58:12.2 |
HIP 104740 |
11.16 |
| 2026-08-15 12:00 |
21:12:07.96 |
-00:59:15.5 |
HIP 104626 |
10.20 |
| 2026-08-16 00:00 |
21:11:30.95 |
-01:00:19.5 |
HIP 104626 |
8.27 |
| 2026-08-16 12:00 |
21:10:54.05 |
-01:01:24.1 |
HIP 104626 |
14.34 |
| 2026-08-17 00:00 |
21:10:17.26 |
-01:02:29.3 |
HIP 104626 |
22.69 |
| 2026-08-17 12:00 |
21:09:40.60 |
-01:03:35.1 |
HIP 104338 |
23.19 |
| 2026-08-18 00:00 |
21:09:04.06 |
-01:04:41.5 |
HIP 104338 |
14.67 |
| 2026-08-18 12:00 |
21:08:27.64 |
-01:05:48.5 |
HIP 104338 |
7.88 |
| 2026-08-19 00:00 |
21:07:51.36 |
-01:06:56.0 |
HIP 104338 |
8.79 |