| Parameter |
Value |
| Designation |
C/2023 RS61 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2028-11-30T20:33:40.728960Z |
| Orbit solution date (soln_date, UTC) |
2026-10-01T14:42:11Z |
| Obs used |
547 |
| NEO |
- |
| M1 |
6.600 |
| K1 |
7.750 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2025-04-25.0000000 |
| e |
0.32776313 |
| q (au) |
7.999044 |
| a (au) |
11.899145 |
| i (deg) |
19.944335 |
| Ω (om, deg) |
347.018075 |
| ω (w, deg) |
119.389385 |
| M (ma, deg) |
328.403495 |
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) |
| 2026-09-25 00:00 |
04:38:22.59 |
+42:51:15.8 |
HIP 21614 |
6.88 |
| 2026-09-25 12:00 |
04:38:23.00 |
+42:52:31.3 |
HIP 21614 |
5.62 |
| 2026-09-26 00:00 |
04:38:23.27 |
+42:53:46.5 |
HIP 21614 |
4.37 |
| 2026-09-26 12:00 |
04:38:23.38 |
+42:55:01.4 |
HIP 21614 |
3.12 |
| 2026-09-27 00:00 |
04:38:23.33 |
+42:56:15.9 |
HIP 21614 |
1.89 |
| 2026-09-27 12:00 |
04:38:23.13 |
+42:57:30.2 |
HIP 21614 |
0.71 |
| 2026-09-28 00:00 |
04:38:22.77 |
+42:58:44.0 |
HIP 21614 |
0.73 |
| 2026-09-28 12:00 |
04:38:22.25 |
+42:59:57.5 |
HIP 21614 |
1.90 |
| 2026-09-29 00:00 |
04:38:21.58 |
+43:01:10.7 |
HIP 21614 |
3.11 |
| 2026-09-29 12:00 |
04:38:20.76 |
+43:02:23.5 |
HIP 21614 |
4.33 |
| 2026-09-30 00:00 |
04:38:19.77 |
+43:03:36.0 |
HIP 21614 |
5.55 |
| 2026-09-30 12:00 |
04:38:18.63 |
+43:04:48.0 |
HIP 21614 |
6.77 |
| 2026-10-01 00:00 |
04:38:17.33 |
+43:05:59.7 |
HIP 21614 |
7.99 |
| 2026-10-01 12:00 |
04:38:15.88 |
+43:07:11.1 |
HIP 21614 |
9.21 |
| 2026-10-02 00:00 |
04:38:14.27 |
+43:08:22.0 |
HIP 21614 |
10.42 |
| 2026-10-02 12:00 |
04:38:12.50 |
+43:09:32.5 |
HIP 21614 |
11.64 |
| 2026-10-03 00:00 |
04:38:10.58 |
+43:10:42.6 |
HIP 21538 |
12.35 |
| 2026-10-03 12:00 |
04:38:08.50 |
+43:11:52.3 |
HIP 21538 |
13.04 |
| 2026-10-04 00:00 |
04:38:06.26 |
+43:13:01.6 |
HIP 21538 |
13.77 |
| 2026-10-04 12:00 |
04:38:03.86 |
+43:14:10.5 |
HIP 21538 |
14.56 |
| 2026-10-05 00:00 |
04:38:01.31 |
+43:15:18.9 |
HIP 21538 |
15.38 |
| 2026-10-05 12:00 |
04:37:58.60 |
+43:16:26.9 |
HIP 21538 |
16.24 |
| 2026-10-06 00:00 |
04:37:55.74 |
+43:17:34.4 |
HIP 21538 |
17.13 |
| 2026-10-06 12:00 |
04:37:52.72 |
+43:18:41.5 |
HIP 21574 |
17.05 |
| 2026-10-07 00:00 |
04:37:49.54 |
+43:19:48.1 |
HIP 21574 |
15.99 |
| 2026-10-07 12:00 |
04:37:46.20 |
+43:20:54.2 |
HIP 21574 |
14.97 |
| 2026-10-08 00:00 |
04:37:42.71 |
+43:22:00.0 |
HIP 21574 |
14.01 |
| 2026-10-08 12:00 |
04:37:39.07 |
+43:23:05.1 |
HIP 21574 |
13.11 |
| 2026-10-09 00:00 |
04:37:35.27 |
+43:24:09.8 |
HIP 21574 |
12.29 |
| 2026-10-09 12:00 |
04:37:31.31 |
+43:25:14.0 |
HIP 21574 |
11.58 |
| 2026-10-10 00:00 |
04:37:27.20 |
+43:26:17.7 |
HIP 21574 |
10.99 |
| 2026-10-10 12:00 |
04:37:22.94 |
+43:27:20.8 |
HIP 21574 |
10.56 |
| 2026-10-11 00:00 |
04:37:18.52 |
+43:28:23.5 |
HIP 21574 |
10.30 |
| 2026-10-11 12:00 |
04:37:13.95 |
+43:29:25.6 |
HIP 21574 |
10.23 |
| 2026-10-12 00:00 |
04:37:09.22 |
+43:30:27.2 |
HIP 21574 |
10.36 |
| 2026-10-12 12:00 |
04:37:04.35 |
+43:31:28.2 |
HIP 21574 |
10.69 |
| 2026-10-13 00:00 |
04:36:59.32 |
+43:32:28.7 |
HIP 21574 |
11.20 |
| 2026-10-13 12:00 |
04:36:54.15 |
+43:33:28.6 |
HIP 21574 |
11.87 |
| 2026-10-14 00:00 |
04:36:48.82 |
+43:34:28.0 |
HIP 21574 |
12.68 |
| 2026-10-14 12:00 |
04:36:43.34 |
+43:35:26.8 |
HIP 21574 |
13.61 |
| 2026-10-15 00:00 |
04:36:37.72 |
+43:36:25.0 |
HIP 21574 |
14.64 |
| 2026-10-15 12:00 |
04:36:31.94 |
+43:37:22.6 |
HIP 21574 |
15.76 |
| 2026-10-16 00:00 |
04:36:26.02 |
+43:38:19.6 |
HIP 21574 |
16.94 |