C/2025 V2 (Rankin)
| Parameter |
Value |
| Designation |
C/2025 V2 (Rankin) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2027-03-23T01:52:33.335040Z |
| Orbit solution date (soln_date, UTC) |
2026-01-13T08:12:18Z |
| Obs used |
117 |
| NEO |
- |
| M1 |
7.600 |
| K1 |
11.250 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2025-11-02T11:21:58.089600Z |
| Discovery magnitude (MPC) |
19.86 G |
| Discovery observatory (MPC) |
G96 · Mt. Lemmon Survey |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2025-09-19.0000000 |
| e |
1.00060332 |
| q (au) |
1.954620 |
| a (au) |
-3239.768280 |
| i (deg) |
37.257588 |
| Ω (om, deg) |
138.084828 |
| ω (w, deg) |
102.666799 |
| M (ma, deg) |
-0.002940 |
Magnitude
Scatter + Global Linear
$$
M_a = (7.405 + 4.168\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
7.405 |
| n |
4.168 |
| gf |
0.990 |
| gb |
-0.684 |
| k |
1.000 |
| δ90 |
9.999 |
| 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) |
| 2026-02-03 00:00 |
09:31:46.73 |
+15:31:36.4 |
HIP 46745 |
14.72 |
| 2026-02-03 12:00 |
09:31:29.10 |
+15:35:00.4 |
HIP 46745 |
11.45 |
| 2026-02-04 00:00 |
09:31:11.38 |
+15:38:24.8 |
HIP 46745 |
10.25 |
| 2026-02-04 12:00 |
09:30:53.59 |
+15:41:49.8 |
HIP 46745 |
11.78 |
| 2026-02-05 00:00 |
09:30:35.71 |
+15:45:15.3 |
HIP 46745 |
15.27 |
| 2026-02-05 12:00 |
09:30:17.76 |
+15:48:41.2 |
HIP 46745 |
19.71 |
| 2026-02-06 00:00 |
09:29:59.73 |
+15:52:07.6 |
HIP 46745 |
24.61 |
| 2026-02-06 12:00 |
09:29:41.63 |
+15:55:34.3 |
HIP 46561 |
25.19 |
| 2026-02-07 00:00 |
09:29:23.47 |
+15:59:01.5 |
HIP 46561 |
22.21 |
| 2026-02-07 12:00 |
09:29:05.24 |
+16:02:29.0 |
HIP 46561 |
20.36 |
| 2026-02-08 00:00 |
09:28:46.95 |
+16:05:56.9 |
HIP 46561 |
19.95 |
| 2026-02-08 12:00 |
09:28:28.60 |
+16:09:25.1 |
HIP 46561 |
21.07 |
| 2026-02-09 00:00 |
09:28:10.19 |
+16:12:53.6 |
HIP 46561 |
23.53 |
| 2026-02-09 12:00 |
09:27:51.73 |
+16:16:22.4 |
HIP 46561 |
26.96 |
| 2026-02-10 00:00 |
09:27:33.23 |
+16:19:51.4 |
HIP 46311 |
25.73 |
| 2026-02-10 12:00 |
09:27:14.68 |
+16:23:20.7 |
HIP 46311 |
20.54 |
| 2026-02-11 00:00 |
09:26:56.09 |
+16:26:50.1 |
HIP 46311 |
15.68 |
| 2026-02-11 12:00 |
09:26:37.46 |
+16:30:19.8 |
HIP 46311 |
11.57 |
| 2026-02-12 00:00 |
09:26:18.79 |
+16:33:49.6 |
HIP 46311 |
9.28 |
| 2026-02-12 12:00 |
09:26:00.09 |
+16:37:19.5 |
HIP 46232 |
6.95 |
| 2026-02-13 00:00 |
09:25:41.37 |
+16:40:49.5 |
HIP 46232 |
6.07 |
| 2026-02-13 12:00 |
09:25:22.62 |
+16:44:19.6 |
HIP 46232 |
9.49 |
| 2026-02-14 00:00 |
09:25:03.85 |
+16:47:49.7 |
HIP 46232 |
14.43 |
| 2026-02-14 12:00 |
09:24:45.06 |
+16:51:19.9 |
HIP 46232 |
19.79 |
| 2026-02-15 00:00 |
09:24:26.26 |
+16:54:50.1 |
HIP 46232 |
25.29 |
| 2026-02-15 12:00 |
09:24:07.44 |
+16:58:20.2 |
HIP 46232 |
30.87 |
| 2026-02-16 00:00 |
09:23:48.62 |
+17:01:50.3 |
HIP 46232 |
36.49 |
| 2026-02-16 12:00 |
09:23:29.80 |
+17:05:20.4 |
HIP 45827 |
41.07 |
| 2026-02-17 00:00 |
09:23:10.98 |
+17:08:50.3 |
HIP 45827 |
36.52 |
| 2026-02-17 12:00 |
09:22:52.16 |
+17:12:20.1 |
HIP 45827 |
32.34 |
| 2026-02-18 00:00 |
09:22:33.35 |
+17:15:49.8 |
HIP 45827 |
28.69 |
| 2026-02-18 12:00 |
09:22:14.55 |
+17:19:19.3 |
HIP 45827 |
25.80 |
| 2026-02-19 00:00 |
09:21:55.77 |
+17:22:48.6 |
HIP 45827 |
23.94 |
| 2026-02-19 12:00 |
09:21:37.01 |
+17:26:17.6 |
HIP 45827 |
23.34 |
| 2026-02-20 00:00 |
09:21:18.27 |
+17:29:46.5 |
HIP 45827 |
24.11 |
| 2026-02-20 12:00 |
09:20:59.55 |
+17:33:15.0 |
HIP 45827 |
26.11 |
| 2026-02-21 00:00 |
09:20:40.87 |
+17:36:43.3 |
HIP 45699 |
24.93 |
| 2026-02-21 12:00 |
09:20:22.22 |
+17:40:11.2 |
HIP 45699 |
19.96 |
| 2026-02-22 00:00 |
09:20:03.61 |
+17:43:38.8 |
HIP 45699 |
15.46 |
| 2026-02-22 12:00 |
09:19:45.04 |
+17:47:06.1 |
HIP 45699 |
11.97 |
| 2026-02-23 00:00 |
09:19:26.51 |
+17:50:32.9 |
HIP 45699 |
10.51 |
| 2026-02-23 12:00 |
09:19:08.03 |
+17:53:59.3 |
HIP 45699 |
11.85 |
| 2026-02-24 00:00 |
09:18:49.61 |
+17:57:25.3 |
HIP 45699 |
15.24 |