| Parameter |
Value |
| Designation |
C/2025 W1 (Sankovich) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2025-02-17T17:39:07.554240Z |
| Orbit solution date (soln_date, UTC) |
2025-12-18T15:12:26Z |
| Obs used |
80 |
| NEO |
- |
| M1 |
9.400 |
| K1 |
10.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2025-11-20T03:53:37.536000Z |
| Discovery magnitude (MPC) |
19.80 R |
| Discovery observatory (MPC) |
X19 · Santel Observatory, El Leoncito |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2025-11-26.0000000 |
| e |
0.99973624 |
| q (au) |
4.170169 |
| a (au) |
15810.455383 |
| i (deg) |
79.800605 |
| Ω (om, deg) |
95.890663 |
| ω (w, deg) |
250.634842 |
| M (ma, deg) |
0.000139 |
Magnitude
Scatter + Global Linear
$$
M_a = (9.394 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
9.394 |
| n |
6.000 |
| gf |
0.936 |
| gb |
-0.828 |
| k |
0.806 |
| δ90 |
4.562 |
| 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) |
| 2026-06-01 00:00 |
05:34:03.58 |
-16:55:59.6 |
HIP 26004 |
24.59 |
| 2026-06-01 12:00 |
05:34:24.68 |
-16:52:59.5 |
HIP 26303 |
24.03 |
| 2026-06-02 00:00 |
05:34:45.78 |
-16:50:00.9 |
HIP 26303 |
19.04 |
| 2026-06-02 12:00 |
05:35:06.88 |
-16:47:03.8 |
HIP 26303 |
14.68 |
| 2026-06-03 00:00 |
05:35:27.97 |
-16:44:08.2 |
HIP 26303 |
11.68 |
| 2026-06-03 12:00 |
05:35:49.06 |
-16:41:14.2 |
HIP 26303 |
11.19 |
| 2026-06-04 00:00 |
05:36:10.14 |
-16:38:21.7 |
HIP 26303 |
13.44 |
| 2026-06-04 12:00 |
05:36:31.22 |
-16:35:30.7 |
HIP 26416 |
13.31 |
| 2026-06-05 00:00 |
05:36:52.29 |
-16:32:41.3 |
HIP 26416 |
11.41 |
| 2026-06-05 12:00 |
05:37:13.35 |
-16:29:53.3 |
HIP 26416 |
12.21 |
| 2026-06-06 00:00 |
05:37:34.41 |
-16:27:06.9 |
HIP 26416 |
15.30 |
| 2026-06-06 12:00 |
05:37:55.46 |
-16:24:21.9 |
HIP 26416 |
19.61 |
| 2026-06-07 00:00 |
05:38:16.50 |
-16:21:38.5 |
HIP 26416 |
24.49 |
| 2026-06-07 12:00 |
05:38:37.52 |
-16:18:56.5 |
HIP 26416 |
29.66 |
| 2026-06-08 00:00 |
05:38:58.54 |
-16:16:16.1 |
HIP 26628 |
25.69 |
| 2026-06-08 12:00 |
05:39:19.55 |
-16:13:37.1 |
HIP 26628 |
21.83 |
| 2026-06-09 00:00 |
05:39:40.55 |
-16:10:59.7 |
HIP 26628 |
18.96 |
| 2026-06-09 12:00 |
05:40:01.53 |
-16:08:23.7 |
HIP 26628 |
17.55 |
| 2026-06-10 00:00 |
05:40:22.50 |
-16:05:49.2 |
HIP 26628 |
17.92 |
| 2026-06-10 12:00 |
05:40:43.46 |
-16:03:16.3 |
HIP 26628 |
19.98 |
| 2026-06-11 00:00 |
05:41:04.40 |
-16:00:44.7 |
HIP 26628 |
23.26 |
| 2026-06-11 12:00 |
05:41:25.33 |
-15:58:14.7 |
HIP 26834 |
21.53 |
| 2026-06-12 00:00 |
05:41:46.24 |
-15:55:46.2 |
HIP 26834 |
18.04 |
| 2026-06-12 12:00 |
05:42:07.14 |
-15:53:19.1 |
HIP 26834 |
15.84 |
| 2026-06-13 00:00 |
05:42:28.02 |
-15:50:53.5 |
HIP 26834 |
15.49 |
| 2026-06-13 12:00 |
05:42:48.88 |
-15:48:29.3 |
HIP 26834 |
17.07 |
| 2026-06-14 00:00 |
05:43:09.72 |
-15:46:06.7 |
HIP 26834 |
20.12 |
| 2026-06-14 12:00 |
05:43:30.54 |
-15:43:45.4 |
HIP 26834 |
24.09 |
| 2026-06-15 00:00 |
05:43:51.34 |
-15:41:25.7 |
HIP 26834 |
28.59 |
| 2026-06-15 12:00 |
05:44:12.12 |
-15:39:07.4 |
HIP 27185 |
25.26 |
| 2026-06-16 00:00 |
05:44:32.87 |
-15:36:50.5 |
HIP 27185 |
22.62 |
| 2026-06-16 12:00 |
05:44:53.61 |
-15:34:35.1 |
HIP 27185 |
21.10 |
| 2026-06-17 00:00 |
05:45:14.32 |
-15:32:21.2 |
HIP 27185 |
20.92 |
| 2026-06-17 12:00 |
05:45:35.00 |
-15:30:08.6 |
HIP 27185 |
22.11 |
| 2026-06-18 00:00 |
05:45:55.66 |
-15:27:57.6 |
HIP 27185 |
24.45 |
| 2026-06-18 12:00 |
05:46:16.29 |
-15:25:47.9 |
HIP 27342 |
20.19 |
| 2026-06-19 00:00 |
05:46:36.90 |
-15:23:39.7 |
HIP 27342 |
14.87 |
| 2026-06-19 12:00 |
05:46:57.48 |
-15:21:32.8 |
HIP 27342 |
9.65 |
| 2026-06-20 00:00 |
05:47:18.03 |
-15:19:27.4 |
HIP 27342 |
4.88 |
| 2026-06-20 12:00 |
05:47:38.55 |
-15:17:23.4 |
HIP 27342 |
3.51 |
| 2026-06-21 00:00 |
05:47:59.04 |
-15:15:20.8 |
HIP 27342 |
7.63 |
| 2026-06-21 12:00 |
05:48:19.50 |
-15:13:19.6 |
HIP 27342 |
12.70 |
| 2026-06-22 00:00 |
05:48:39.93 |
-15:11:19.8 |
HIP 27342 |
17.90 |