| Parameter |
Value |
| Designation |
C/2023 RS61 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2028-11-30T18:35:59.766720Z |
| Orbit solution date (soln_date, UTC) |
2026-04-14T13:42:18Z |
| Obs used |
508 |
| NEO |
- |
| M1 |
6.500 |
| K1 |
7.750 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2025-04-14.0000000 |
| e |
0.32775300 |
| q (au) |
7.999270 |
| a (au) |
11.899301 |
| i (deg) |
19.944260 |
| Ω (om, deg) |
347.017704 |
| ω (w, deg) |
119.384364 |
| M (ma, deg) |
328.141952 |
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) |
| 2026-05-12 00:00 |
03:32:20.99 |
+36:54:11.0 |
HIP 16576 |
18.06 |
| 2026-05-12 12:00 |
03:32:41.30 |
+36:55:11.5 |
HIP 16576 |
16.40 |
| 2026-05-13 00:00 |
03:33:01.63 |
+36:56:12.2 |
HIP 16576 |
15.72 |
| 2026-05-13 12:00 |
03:33:21.97 |
+36:57:13.2 |
HIP 16576 |
16.14 |
| 2026-05-14 00:00 |
03:33:42.33 |
+36:58:14.4 |
HIP 16576 |
17.58 |
| 2026-05-14 12:00 |
03:34:02.70 |
+36:59:16.0 |
HIP 16576 |
19.84 |
| 2026-05-15 00:00 |
03:34:23.08 |
+37:00:17.8 |
HIP 16576 |
22.66 |
| 2026-05-15 12:00 |
03:34:43.48 |
+37:01:19.8 |
HIP 16576 |
25.86 |
| 2026-05-16 00:00 |
03:35:03.89 |
+37:02:22.2 |
HIP 16576 |
29.32 |
| 2026-05-16 12:00 |
03:35:24.31 |
+37:03:24.8 |
HIP 16576 |
32.96 |
| 2026-05-17 00:00 |
03:35:44.74 |
+37:04:27.7 |
HIP 16935 |
33.80 |
| 2026-05-17 12:00 |
03:36:05.18 |
+37:05:30.8 |
HIP 16935 |
30.04 |
| 2026-05-18 00:00 |
03:36:25.63 |
+37:06:34.2 |
HIP 16935 |
26.40 |
| 2026-05-18 12:00 |
03:36:46.09 |
+37:07:37.8 |
HIP 16935 |
22.95 |
| 2026-05-19 00:00 |
03:37:06.56 |
+37:08:41.7 |
HIP 16935 |
19.80 |
| 2026-05-19 12:00 |
03:37:27.03 |
+37:09:45.9 |
HIP 16935 |
17.11 |
| 2026-05-20 00:00 |
03:37:47.51 |
+37:10:50.3 |
HIP 16935 |
15.12 |
| 2026-05-20 12:00 |
03:38:08.00 |
+37:11:54.9 |
HIP 16935 |
14.13 |
| 2026-05-21 00:00 |
03:38:28.49 |
+37:12:59.8 |
HIP 16935 |
14.37 |
| 2026-05-21 12:00 |
03:38:48.99 |
+37:14:04.9 |
HIP 16935 |
15.76 |
| 2026-05-22 00:00 |
03:39:09.49 |
+37:15:10.3 |
HIP 16935 |
18.06 |
| 2026-05-22 12:00 |
03:39:29.99 |
+37:16:15.9 |
HIP 16935 |
20.95 |
| 2026-05-23 00:00 |
03:39:50.50 |
+37:17:21.7 |
HIP 17203 |
23.25 |
| 2026-05-23 12:00 |
03:40:11.00 |
+37:18:27.8 |
HIP 17203 |
19.87 |
| 2026-05-24 00:00 |
03:40:31.51 |
+37:19:34.1 |
HIP 17203 |
16.87 |
| 2026-05-24 12:00 |
03:40:52.02 |
+37:20:40.6 |
HIP 17203 |
14.48 |
| 2026-05-25 00:00 |
03:41:12.53 |
+37:21:47.3 |
HIP 17203 |
13.06 |
| 2026-05-25 12:00 |
03:41:33.04 |
+37:22:54.3 |
HIP 17308 |
11.30 |
| 2026-05-26 00:00 |
03:41:53.55 |
+37:24:01.5 |
HIP 17308 |
9.37 |
| 2026-05-26 12:00 |
03:42:14.06 |
+37:25:08.9 |
HIP 17308 |
9.14 |
| 2026-05-27 00:00 |
03:42:34.57 |
+37:26:16.5 |
HIP 17308 |
10.74 |
| 2026-05-27 12:00 |
03:42:55.07 |
+37:27:24.4 |
HIP 17308 |
13.52 |
| 2026-05-28 00:00 |
03:43:15.57 |
+37:28:32.5 |
HIP 17308 |
16.91 |
| 2026-05-28 12:00 |
03:43:36.07 |
+37:29:40.7 |
HIP 17308 |
20.62 |
| 2026-05-29 00:00 |
03:43:56.56 |
+37:30:49.2 |
HIP 17536 |
17.15 |
| 2026-05-29 12:00 |
03:44:17.05 |
+37:31:57.9 |
HIP 17536 |
14.05 |
| 2026-05-30 00:00 |
03:44:37.53 |
+37:33:06.8 |
HIP 17536 |
11.70 |
| 2026-05-30 12:00 |
03:44:58.01 |
+37:34:15.9 |
HIP 17536 |
10.58 |
| 2026-05-31 00:00 |
03:45:18.48 |
+37:35:25.2 |
HIP 17536 |
11.08 |
| 2026-05-31 12:00 |
03:45:38.95 |
+37:36:34.8 |
HIP 17536 |
13.01 |
| 2026-06-01 00:00 |
03:45:59.41 |
+37:37:44.5 |
HIP 17536 |
15.86 |
| 2026-06-01 12:00 |
03:46:19.85 |
+37:38:54.4 |
HIP 17536 |
19.22 |
| 2026-06-02 00:00 |
03:46:40.30 |
+37:40:04.5 |
HIP 17741 |
17.73 |