| Parameter |
Value |
| Designation |
C/2025 V2 (Rankin) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2027-03-22T23:18:59.492160Z |
| Orbit solution date (soln_date, UTC) |
2026-03-31T09:42:23Z |
| Obs used |
308 |
| NEO |
- |
| M1 |
8.000 |
| K1 |
10.750 |
| 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) |
2025-12-23.0000000 |
| e |
1.00073358 |
| q (au) |
1.953224 |
| a (au) |
-2662.596967 |
| i (deg) |
37.274360 |
| Ω (om, deg) |
138.082315 |
| ω (w, deg) |
102.692966 |
| M (ma, deg) |
-0.003264 |
Magnitude
Scatter + Global Linear
$$
M_a = (7.451 + 4.177\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
7.451 |
| n |
4.177 |
| gf |
1.000 |
| gb |
-0.958 |
| 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
Finding Chart
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-03-26 00:00 |
09:03:58.94 |
+20:58:57.8 |
HIP 44467 |
26.28 |
| 2026-03-26 12:00 |
09:03:49.45 |
+21:01:26.1 |
HIP 44467 |
28.35 |
| 2026-03-27 00:00 |
09:03:40.19 |
+21:03:53.1 |
HIP 44408 |
30.13 |
| 2026-03-27 12:00 |
09:03:31.14 |
+21:06:18.8 |
HIP 44408 |
27.05 |
| 2026-03-28 00:00 |
09:03:22.33 |
+21:08:43.2 |
HIP 44408 |
24.05 |
| 2026-03-28 12:00 |
09:03:13.73 |
+21:11:06.4 |
HIP 44408 |
21.12 |
| 2026-03-29 00:00 |
09:03:05.37 |
+21:13:28.2 |
HIP 44408 |
18.30 |
| 2026-03-29 12:00 |
09:02:57.23 |
+21:15:48.8 |
HIP 44408 |
15.60 |
| 2026-03-30 00:00 |
09:02:49.33 |
+21:18:08.0 |
HIP 44408 |
13.06 |
| 2026-03-30 12:00 |
09:02:41.65 |
+21:20:26.0 |
HIP 44408 |
10.75 |
| 2026-03-31 00:00 |
09:02:34.20 |
+21:22:42.7 |
HIP 44408 |
8.82 |
| 2026-03-31 12:00 |
09:02:26.99 |
+21:24:58.0 |
HIP 44408 |
7.49 |
| 2026-04-01 00:00 |
09:02:20.02 |
+21:27:12.1 |
HIP 44408 |
7.06 |
| 2026-04-01 12:00 |
09:02:13.27 |
+21:29:24.9 |
HIP 44408 |
7.62 |
| 2026-04-02 00:00 |
09:02:06.77 |
+21:31:36.3 |
HIP 44408 |
8.94 |
| 2026-04-02 12:00 |
09:02:00.50 |
+21:33:46.5 |
HIP 44408 |
10.71 |
| 2026-04-03 00:00 |
09:01:54.47 |
+21:35:55.3 |
HIP 44408 |
12.71 |
| 2026-04-03 12:00 |
09:01:48.68 |
+21:38:02.8 |
HIP 44408 |
14.83 |
| 2026-04-04 00:00 |
09:01:43.12 |
+21:40:09.0 |
HIP 44408 |
17.00 |
| 2026-04-04 12:00 |
09:01:37.81 |
+21:42:13.9 |
HIP 44259 |
19.02 |
| 2026-04-05 00:00 |
09:01:32.74 |
+21:44:17.5 |
HIP 44259 |
20.03 |
| 2026-04-05 12:00 |
09:01:27.92 |
+21:46:19.8 |
HIP 44259 |
21.27 |
| 2026-04-06 00:00 |
09:01:23.33 |
+21:48:20.8 |
HIP 44259 |
22.68 |
| 2026-04-06 12:00 |
09:01:18.99 |
+21:50:20.4 |
HIP 44259 |
24.22 |
| 2026-04-07 00:00 |
09:01:14.90 |
+21:52:18.7 |
HIP 44259 |
25.85 |
| 2026-04-07 12:00 |
09:01:11.05 |
+21:54:15.7 |
HIP 44259 |
27.55 |
| 2026-04-08 00:00 |
09:01:07.45 |
+21:56:11.4 |
HIP 44259 |
29.30 |
| 2026-04-08 12:00 |
09:01:04.10 |
+21:58:05.8 |
HIP 44414 |
30.22 |
| 2026-04-09 00:00 |
09:01:00.99 |
+21:59:58.9 |
HIP 44228 |
29.05 |
| 2026-04-09 12:00 |
09:00:58.13 |
+22:01:50.6 |
HIP 44228 |
27.08 |
| 2026-04-10 00:00 |
09:00:55.52 |
+22:03:41.1 |
HIP 44228 |
25.15 |
| 2026-04-10 12:00 |
09:00:53.16 |
+22:05:30.2 |
HIP 44228 |
23.26 |
| 2026-04-11 00:00 |
09:00:51.05 |
+22:07:18.0 |
HIP 44228 |
21.40 |
| 2026-04-11 12:00 |
09:00:49.19 |
+22:09:04.5 |
HIP 44228 |
19.57 |
| 2026-04-12 00:00 |
09:00:47.59 |
+22:10:49.6 |
HIP 44228 |
17.78 |
| 2026-04-12 12:00 |
09:00:46.23 |
+22:12:33.5 |
HIP 44228 |
16.02 |
| 2026-04-13 00:00 |
09:00:45.13 |
+22:14:16.0 |
HIP 44228 |
14.30 |
| 2026-04-13 12:00 |
09:00:44.28 |
+22:15:57.3 |
HIP 44228 |
12.62 |
| 2026-04-14 00:00 |
09:00:43.68 |
+22:17:37.2 |
HIP 44228 |
10.98 |
| 2026-04-14 12:00 |
09:00:43.34 |
+22:19:15.8 |
HIP 44228 |
9.39 |
| 2026-04-15 00:00 |
09:00:43.25 |
+22:20:53.1 |
HIP 44228 |
7.87 |
| 2026-04-15 12:00 |
09:00:43.41 |
+22:22:29.1 |
HIP 44228 |
6.44 |
| 2026-04-16 00:00 |
09:00:43.83 |
+22:24:03.8 |
HIP 44228 |
5.18 |