| Parameter |
Value |
| Designation |
P/2021 R5 (Rankin) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2022-01-11T23:34:59.966400Z |
| Orbit solution date (soln_date, UTC) |
2024-04-29T13:12:24Z |
| Obs used |
251 |
| NEO |
- |
| M1 |
7.200 |
| K1 |
18.750 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2021-09-09T06:52:28.416000Z |
| Discovery magnitude (MPC) |
19.34 G |
| Discovery observatory (MPC) |
G96 · University of Arizona Mt. Lemmon Survey |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2021-10-17.0000000 |
| e |
0.30753521 |
| q (au) |
3.322719 |
| a (au) |
4.798394 |
| i (deg) |
7.852203 |
| Ω (om, deg) |
219.963779 |
| ω (w, deg) |
167.335702 |
| M (ma, deg) |
351.843709 |
Magnitude
Scatter + Global Linear
$$
M_a = (8.399 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
8.399 |
| n |
6.000 |
| gf |
0.975 |
| gb |
-0.934 |
| k |
1.000 |
| δ90 |
9.557 |
| 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 |
12:01:02.54 |
-04:37:23.0 |
HIP 58558 |
9.81 |
| 2026-06-01 12:00 |
12:01:02.77 |
-04:36:49.6 |
HIP 58558 |
9.62 |
| 2026-06-02 00:00 |
12:01:03.15 |
-04:36:17.3 |
HIP 58558 |
9.50 |
| 2026-06-02 12:00 |
12:01:03.68 |
-04:35:45.9 |
HIP 58558 |
9.45 |
| 2026-06-03 00:00 |
12:01:04.35 |
-04:35:15.5 |
HIP 58558 |
9.48 |
| 2026-06-03 12:00 |
12:01:05.17 |
-04:34:46.0 |
HIP 58558 |
9.57 |
| 2026-06-04 00:00 |
12:01:06.14 |
-04:34:17.6 |
HIP 58558 |
9.72 |
| 2026-06-04 12:00 |
12:01:07.26 |
-04:33:50.2 |
HIP 58558 |
9.95 |
| 2026-06-05 00:00 |
12:01:08.52 |
-04:33:23.7 |
HIP 58558 |
10.23 |
| 2026-06-05 12:00 |
12:01:09.93 |
-04:32:58.2 |
HIP 58558 |
10.57 |
| 2026-06-06 00:00 |
12:01:11.49 |
-04:32:33.7 |
HIP 58558 |
10.96 |
| 2026-06-06 12:00 |
12:01:13.19 |
-04:32:10.2 |
HIP 58558 |
11.41 |
| 2026-06-07 00:00 |
12:01:15.04 |
-04:31:47.7 |
HIP 58558 |
11.89 |
| 2026-06-07 12:00 |
12:01:17.03 |
-04:31:26.1 |
HIP 58558 |
12.43 |
| 2026-06-08 00:00 |
12:01:19.17 |
-04:31:05.6 |
HIP 58558 |
13.00 |
| 2026-06-08 12:00 |
12:01:21.45 |
-04:30:46.0 |
HIP 58558 |
13.61 |
| 2026-06-09 00:00 |
12:01:23.88 |
-04:30:27.4 |
HIP 58558 |
14.26 |
| 2026-06-09 12:00 |
12:01:26.45 |
-04:30:09.8 |
HIP 58558 |
14.94 |
| 2026-06-10 00:00 |
12:01:29.17 |
-04:29:53.2 |
HIP 58558 |
15.66 |
| 2026-06-10 12:00 |
12:01:32.03 |
-04:29:37.6 |
HIP 58558 |
16.41 |
| 2026-06-11 00:00 |
12:01:35.03 |
-04:29:22.9 |
HIP 58558 |
17.19 |
| 2026-06-11 12:00 |
12:01:38.18 |
-04:29:09.3 |
HIP 58558 |
18.01 |
| 2026-06-12 00:00 |
12:01:41.47 |
-04:28:56.6 |
HIP 58558 |
18.85 |
| 2026-06-12 12:00 |
12:01:44.91 |
-04:28:44.9 |
HIP 58558 |
19.73 |
| 2026-06-13 00:00 |
12:01:48.48 |
-04:28:34.2 |
HIP 58558 |
20.64 |
| 2026-06-13 12:00 |
12:01:52.20 |
-04:28:24.5 |
HIP 58558 |
21.58 |
| 2026-06-14 00:00 |
12:01:56.06 |
-04:28:15.8 |
HIP 58558 |
22.55 |
| 2026-06-14 12:00 |
12:02:00.06 |
-04:28:08.1 |
HIP 58558 |
23.55 |
| 2026-06-15 00:00 |
12:02:04.21 |
-04:28:01.3 |
HIP 58558 |
24.59 |
| 2026-06-15 12:00 |
12:02:08.49 |
-04:27:55.5 |
HIP 58558 |
25.65 |
| 2026-06-16 00:00 |
12:02:12.91 |
-04:27:50.7 |
HIP 58558 |
26.75 |
| 2026-06-16 12:00 |
12:02:17.48 |
-04:27:46.9 |
HIP 58558 |
27.88 |
| 2026-06-17 00:00 |
12:02:22.18 |
-04:27:44.0 |
HIP 58558 |
29.04 |
| 2026-06-17 12:00 |
12:02:27.02 |
-04:27:42.1 |
HIP 58558 |
30.23 |
| 2026-06-18 00:00 |
12:02:32.00 |
-04:27:41.2 |
HIP 58829 |
30.02 |
| 2026-06-18 12:00 |
12:02:37.12 |
-04:27:41.3 |
HIP 58829 |
29.11 |
| 2026-06-19 00:00 |
12:02:42.37 |
-04:27:42.3 |
HIP 58829 |
28.22 |
| 2026-06-19 12:00 |
12:02:47.76 |
-04:27:44.2 |
HIP 58829 |
27.35 |
| 2026-06-20 00:00 |
12:02:53.29 |
-04:27:47.2 |
HIP 58829 |
26.51 |
| 2026-06-20 12:00 |
12:02:58.95 |
-04:27:51.1 |
HIP 58829 |
25.71 |
| 2026-06-21 00:00 |
12:03:04.75 |
-04:27:55.9 |
HIP 58829 |
24.95 |
| 2026-06-21 12:00 |
12:03:10.68 |
-04:28:01.7 |
HIP 58829 |
24.26 |
| 2026-06-22 00:00 |
12:03:16.74 |
-04:28:08.4 |
HIP 58829 |
23.64 |