| Parameter |
Value |
| Designation |
C/2023 RS61 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2028-11-30T18:27:55.788480Z |
| Orbit solution date (soln_date, UTC) |
2026-03-12T13:13:54Z |
| Obs used |
500 |
| NEO |
- |
| M1 |
6.500 |
| K1 |
7.750 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2025-04-13.0000000 |
| e |
0.32775195 |
| q (au) |
7.999284 |
| a (au) |
11.899304 |
| i (deg) |
19.944260 |
| Ω (om, deg) |
347.017698 |
| ω (w, deg) |
119.384009 |
| M (ma, deg) |
328.118087 |
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) |
| 2026-03-26 00:00 |
03:03:06.41 |
+35:45:56.3 |
HIP 14123 |
15.45 |
| 2026-03-26 12:00 |
03:03:22.58 |
+35:46:19.6 |
HIP 14123 |
18.31 |
| 2026-03-27 00:00 |
03:03:38.83 |
+35:46:43.4 |
HIP 14123 |
21.31 |
| 2026-03-27 12:00 |
03:03:55.14 |
+35:47:07.7 |
HIP 14123 |
24.41 |
| 2026-03-28 00:00 |
03:04:11.53 |
+35:47:32.5 |
HIP 14123 |
27.59 |
| 2026-03-28 12:00 |
03:04:27.99 |
+35:47:57.9 |
HIP 14123 |
30.81 |
| 2026-03-29 00:00 |
03:04:44.52 |
+35:48:23.7 |
HIP 14123 |
34.09 |
| 2026-03-29 12:00 |
03:05:01.12 |
+35:48:50.1 |
HIP 14560 |
36.86 |
| 2026-03-30 00:00 |
03:05:17.78 |
+35:49:16.9 |
HIP 14560 |
33.47 |
| 2026-03-30 12:00 |
03:05:34.52 |
+35:49:44.3 |
HIP 14560 |
30.06 |
| 2026-03-31 00:00 |
03:05:51.32 |
+35:50:12.1 |
HIP 14560 |
26.65 |
| 2026-03-31 12:00 |
03:06:08.18 |
+35:50:40.4 |
HIP 14560 |
23.23 |
| 2026-04-01 00:00 |
03:06:25.12 |
+35:51:09.3 |
HIP 14560 |
19.80 |
| 2026-04-01 12:00 |
03:06:42.12 |
+35:51:38.6 |
HIP 14560 |
16.37 |
| 2026-04-02 00:00 |
03:06:59.18 |
+35:52:08.3 |
HIP 14560 |
12.95 |
| 2026-04-02 12:00 |
03:07:16.31 |
+35:52:38.6 |
HIP 14560 |
9.57 |
| 2026-04-03 00:00 |
03:07:33.50 |
+35:53:09.4 |
HIP 14560 |
6.32 |
| 2026-04-03 12:00 |
03:07:50.75 |
+35:53:40.6 |
HIP 14560 |
3.58 |
| 2026-04-04 00:00 |
03:08:08.07 |
+35:54:12.3 |
HIP 14560 |
3.27 |
| 2026-04-04 12:00 |
03:08:25.45 |
+35:54:44.4 |
HIP 14560 |
5.82 |
| 2026-04-05 00:00 |
03:08:42.88 |
+35:55:17.1 |
HIP 14560 |
9.08 |
| 2026-04-05 12:00 |
03:09:00.38 |
+35:55:50.1 |
HIP 14560 |
12.53 |
| 2026-04-06 00:00 |
03:09:17.95 |
+35:56:23.7 |
HIP 14560 |
16.04 |
| 2026-04-06 12:00 |
03:09:35.57 |
+35:56:57.7 |
HIP 14560 |
19.60 |
| 2026-04-07 00:00 |
03:09:53.24 |
+35:57:32.2 |
HIP 14560 |
23.19 |
| 2026-04-07 12:00 |
03:10:10.98 |
+35:58:07.1 |
HIP 14560 |
26.80 |
| 2026-04-08 00:00 |
03:10:28.78 |
+35:58:42.5 |
HIP 14560 |
30.42 |
| 2026-04-08 12:00 |
03:10:46.63 |
+35:59:18.4 |
HIP 14775 |
31.48 |
| 2026-04-09 00:00 |
03:11:04.54 |
+35:59:54.7 |
HIP 14775 |
31.16 |
| 2026-04-09 12:00 |
03:11:22.51 |
+36:00:31.4 |
HIP 15035 |
29.96 |
| 2026-04-10 00:00 |
03:11:40.53 |
+36:01:08.6 |
HIP 15035 |
26.29 |
| 2026-04-10 12:00 |
03:11:58.61 |
+36:01:46.2 |
HIP 15035 |
22.61 |
| 2026-04-11 00:00 |
03:12:16.74 |
+36:02:24.3 |
HIP 15035 |
18.92 |
| 2026-04-11 12:00 |
03:12:34.92 |
+36:03:02.7 |
HIP 15035 |
15.24 |
| 2026-04-12 00:00 |
03:12:53.16 |
+36:03:41.7 |
HIP 15035 |
11.59 |
| 2026-04-12 12:00 |
03:13:11.46 |
+36:04:21.0 |
HIP 15035 |
8.00 |
| 2026-04-13 00:00 |
03:13:29.80 |
+36:05:00.8 |
HIP 15035 |
4.65 |
| 2026-04-13 12:00 |
03:13:48.20 |
+36:05:41.1 |
HIP 15035 |
2.78 |
| 2026-04-14 00:00 |
03:14:06.64 |
+36:06:21.7 |
HIP 15035 |
4.72 |
| 2026-04-14 12:00 |
03:14:25.14 |
+36:07:02.8 |
HIP 15035 |
8.11 |
| 2026-04-15 00:00 |
03:14:43.68 |
+36:07:44.3 |
HIP 15035 |
11.75 |
| 2026-04-15 12:00 |
03:15:02.28 |
+36:08:26.2 |
HIP 15035 |
15.49 |
| 2026-04-16 00:00 |
03:15:20.92 |
+36:09:08.5 |
HIP 15035 |
19.27 |