C/2023 RS61 (PANSTARRS)
| Parameter |
Value |
| Designation |
C/2023 RS61 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2028-11-30T17:25:11.893440Z |
| Orbit solution date (soln_date, UTC) |
2026-01-07T15:42:41Z |
| Obs used |
464 |
| NEO |
- |
| M1 |
6.500 |
| K1 |
7.750 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2025-04-04.0000000 |
| e |
0.32774112 |
| q (au) |
7.999405 |
| a (au) |
11.899292 |
| i (deg) |
19.944218 |
| Ω (om, deg) |
347.017488 |
| ω (w, deg) |
119.381304 |
| M (ma, deg) |
327.902978 |
Magnitude
Scatter + Global Linear
$$
M_a = (H_0 + n\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
- |
| n |
- |
| gf |
- |
| gb |
- |
| k |
- |
| δ90 |
- |
| 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 |
02:43:54.59 |
+35:56:57.8 |
HIP 12919 |
32.81 |
| 2026-02-03 12:00 |
02:44:00.07 |
+35:56:21.1 |
HIP 12919 |
32.29 |
| 2026-02-04 00:00 |
02:44:05.68 |
+35:55:44.9 |
HIP 12919 |
31.78 |
| 2026-02-04 12:00 |
02:44:11.42 |
+35:55:09.3 |
HIP 12919 |
31.29 |
| 2026-02-05 00:00 |
02:44:17.30 |
+35:54:34.3 |
HIP 12919 |
30.82 |
| 2026-02-05 12:00 |
02:44:23.31 |
+35:53:59.8 |
HIP 12919 |
30.37 |
| 2026-02-06 00:00 |
02:44:29.44 |
+35:53:26.0 |
HIP 12919 |
29.96 |
| 2026-02-06 12:00 |
02:44:35.71 |
+35:52:52.7 |
HIP 12982 |
29.51 |
| 2026-02-07 00:00 |
02:44:42.11 |
+35:52:20.0 |
HIP 12982 |
28.37 |
| 2026-02-07 12:00 |
02:44:48.63 |
+35:51:47.8 |
HIP 12982 |
27.22 |
| 2026-02-08 00:00 |
02:44:55.29 |
+35:51:16.3 |
HIP 12982 |
26.08 |
| 2026-02-08 12:00 |
02:45:02.07 |
+35:50:45.3 |
HIP 12982 |
24.94 |
| 2026-02-09 00:00 |
02:45:08.98 |
+35:50:15.0 |
HIP 12982 |
23.80 |
| 2026-02-09 12:00 |
02:45:16.02 |
+35:49:45.2 |
HIP 12982 |
22.68 |
| 2026-02-10 00:00 |
02:45:23.19 |
+35:49:16.0 |
HIP 12982 |
21.58 |
| 2026-02-10 12:00 |
02:45:30.48 |
+35:48:47.4 |
HIP 12982 |
20.51 |
| 2026-02-11 00:00 |
02:45:37.90 |
+35:48:19.5 |
HIP 12982 |
19.47 |
| 2026-02-11 12:00 |
02:45:45.45 |
+35:47:52.1 |
HIP 12982 |
18.49 |
| 2026-02-12 00:00 |
02:45:53.12 |
+35:47:25.3 |
HIP 12982 |
17.57 |
| 2026-02-12 12:00 |
02:46:00.92 |
+35:46:59.1 |
HIP 12982 |
16.72 |
| 2026-02-13 00:00 |
02:46:08.84 |
+35:46:33.6 |
HIP 12982 |
15.98 |
| 2026-02-13 12:00 |
02:46:16.88 |
+35:46:08.6 |
HIP 12982 |
15.36 |
| 2026-02-14 00:00 |
02:46:25.05 |
+35:45:44.3 |
HIP 12990 |
14.71 |
| 2026-02-14 12:00 |
02:46:33.35 |
+35:45:20.5 |
HIP 12990 |
13.53 |
| 2026-02-15 00:00 |
02:46:41.76 |
+35:44:57.4 |
HIP 12990 |
12.48 |
| 2026-02-15 12:00 |
02:46:50.30 |
+35:44:34.9 |
HIP 12990 |
11.61 |
| 2026-02-16 00:00 |
02:46:58.96 |
+35:44:13.0 |
HIP 12990 |
10.97 |
| 2026-02-16 12:00 |
02:47:07.74 |
+35:43:51.7 |
HIP 12990 |
10.61 |
| 2026-02-17 00:00 |
02:47:16.64 |
+35:43:31.1 |
HIP 12990 |
10.57 |
| 2026-02-17 12:00 |
02:47:25.67 |
+35:43:11.0 |
HIP 12990 |
10.86 |
| 2026-02-18 00:00 |
02:47:34.81 |
+35:42:51.6 |
HIP 12990 |
11.48 |
| 2026-02-18 12:00 |
02:47:44.07 |
+35:42:32.8 |
HIP 12990 |
12.38 |
| 2026-02-19 00:00 |
02:47:53.45 |
+35:42:14.6 |
HIP 12990 |
13.52 |
| 2026-02-19 12:00 |
02:48:02.95 |
+35:41:57.0 |
HIP 12990 |
14.85 |
| 2026-02-20 00:00 |
02:48:12.56 |
+35:41:40.1 |
HIP 13157 |
15.88 |
| 2026-02-20 12:00 |
02:48:22.29 |
+35:41:23.8 |
HIP 13157 |
14.66 |
| 2026-02-21 00:00 |
02:48:32.14 |
+35:41:08.1 |
HIP 13157 |
13.61 |
| 2026-02-21 12:00 |
02:48:42.10 |
+35:40:53.0 |
HIP 13157 |
12.77 |
| 2026-02-22 00:00 |
02:48:52.18 |
+35:40:38.5 |
HIP 13157 |
12.20 |
| 2026-02-22 12:00 |
02:49:02.37 |
+35:40:24.7 |
HIP 13157 |
11.95 |
| 2026-02-23 00:00 |
02:49:12.67 |
+35:40:11.5 |
HIP 13157 |
12.04 |
| 2026-02-23 12:00 |
02:49:23.09 |
+35:39:58.9 |
HIP 13157 |
12.49 |
| 2026-02-24 00:00 |
02:49:33.62 |
+35:39:46.9 |
HIP 13157 |
13.27 |