| Parameter |
Value |
| Designation |
C/2023 R2 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2024-08-12T01:57:59.866560Z |
| Orbit solution date (soln_date, UTC) |
2024-06-06T23:12:31Z |
| Obs used |
309 |
| NEO |
- |
| M1 |
12.900 |
| K1 |
6.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2023-09-10T14:09:06.796800Z |
| Discovery magnitude (MPC) |
20.68 w |
| Discovery observatory (MPC) |
F52 · Pan-STARRS 2, Haleakala |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2023-10-29.0000000 |
| e |
1.00072698 |
| q (au) |
0.905829 |
| a (au) |
-1246.024129 |
| i (deg) |
30.735653 |
| Ω (om, deg) |
188.987598 |
| ω (w, deg) |
337.188855 |
| M (ma, deg) |
-0.006456 |
Magnitude
Scatter + Global Linear
$$
M_a = (13.443 + 3.943\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
13.443 |
| n |
3.943 |
| gf |
1.000 |
| gb |
-0.721 |
| k |
0.800 |
| δ90 |
10.000 |
| 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 |
20:44:22.27 |
+11:51:44.2 |
HIP 102385 |
9.02 |
| 2026-06-01 12:00 |
20:44:15.99 |
+11:52:51.7 |
HIP 102385 |
9.45 |
| 2026-06-02 00:00 |
20:44:09.60 |
+11:53:58.3 |
HIP 102385 |
10.26 |
| 2026-06-02 12:00 |
20:44:03.09 |
+11:55:04.0 |
HIP 102385 |
11.37 |
| 2026-06-03 00:00 |
20:43:56.46 |
+11:56:08.8 |
HIP 102385 |
12.71 |
| 2026-06-03 12:00 |
20:43:49.70 |
+11:57:12.6 |
HIP 102385 |
14.22 |
| 2026-06-04 00:00 |
20:43:42.83 |
+11:58:15.5 |
HIP 102385 |
15.86 |
| 2026-06-04 12:00 |
20:43:35.84 |
+11:59:17.5 |
HIP 102385 |
17.60 |
| 2026-06-05 00:00 |
20:43:28.74 |
+12:00:18.5 |
HIP 102385 |
19.41 |
| 2026-06-05 12:00 |
20:43:21.51 |
+12:01:18.6 |
HIP 102385 |
21.29 |
| 2026-06-06 00:00 |
20:43:14.17 |
+12:02:17.7 |
HIP 102385 |
23.22 |
| 2026-06-06 12:00 |
20:43:06.71 |
+12:03:15.8 |
HIP 102385 |
25.19 |
| 2026-06-07 00:00 |
20:42:59.14 |
+12:04:12.9 |
HIP 102385 |
27.20 |
| 2026-06-07 12:00 |
20:42:51.45 |
+12:05:09.1 |
HIP 102385 |
29.24 |
| 2026-06-08 00:00 |
20:42:43.65 |
+12:06:04.3 |
HIP 102131 |
28.74 |
| 2026-06-08 12:00 |
20:42:35.74 |
+12:06:58.5 |
HIP 102131 |
27.03 |
| 2026-06-09 00:00 |
20:42:27.71 |
+12:07:51.6 |
HIP 102131 |
25.40 |
| 2026-06-09 12:00 |
20:42:19.57 |
+12:08:43.8 |
HIP 102131 |
23.85 |
| 2026-06-10 00:00 |
20:42:11.32 |
+12:09:34.9 |
HIP 102131 |
22.41 |
| 2026-06-10 12:00 |
20:42:02.96 |
+12:10:25.0 |
HIP 102131 |
21.12 |
| 2026-06-11 00:00 |
20:41:54.49 |
+12:11:14.1 |
HIP 102131 |
20.00 |
| 2026-06-11 12:00 |
20:41:45.91 |
+12:12:02.1 |
HIP 102131 |
19.09 |
| 2026-06-12 00:00 |
20:41:37.22 |
+12:12:49.1 |
HIP 102131 |
18.43 |
| 2026-06-12 12:00 |
20:41:28.42 |
+12:13:35.1 |
HIP 102131 |
18.05 |
| 2026-06-13 00:00 |
20:41:19.52 |
+12:14:19.9 |
HIP 102131 |
17.99 |
| 2026-06-13 12:00 |
20:41:10.51 |
+12:15:03.7 |
HIP 102131 |
18.25 |
| 2026-06-14 00:00 |
20:41:01.39 |
+12:15:46.4 |
HIP 102131 |
18.82 |
| 2026-06-14 12:00 |
20:40:52.18 |
+12:16:28.1 |
HIP 102131 |
19.68 |
| 2026-06-15 00:00 |
20:40:42.86 |
+12:17:08.6 |
HIP 102131 |
20.81 |
| 2026-06-15 12:00 |
20:40:33.43 |
+12:17:48.1 |
HIP 102131 |
22.16 |
| 2026-06-16 00:00 |
20:40:23.91 |
+12:18:26.4 |
HIP 102131 |
23.71 |
| 2026-06-16 12:00 |
20:40:14.29 |
+12:19:03.7 |
HIP 102077 |
24.54 |
| 2026-06-17 00:00 |
20:40:04.56 |
+12:19:39.8 |
HIP 101878 |
24.95 |
| 2026-06-17 12:00 |
20:39:54.74 |
+12:20:14.8 |
HIP 101878 |
22.69 |
| 2026-06-18 00:00 |
20:39:44.83 |
+12:20:48.8 |
HIP 101878 |
20.46 |
| 2026-06-18 12:00 |
20:39:34.81 |
+12:21:21.5 |
HIP 101878 |
18.30 |
| 2026-06-19 00:00 |
20:39:24.71 |
+12:21:53.2 |
HIP 101878 |
16.24 |
| 2026-06-19 12:00 |
20:39:14.51 |
+12:22:23.7 |
HIP 101878 |
14.34 |
| 2026-06-20 00:00 |
20:39:04.22 |
+12:22:53.1 |
HIP 101878 |
12.66 |
| 2026-06-20 12:00 |
20:38:53.83 |
+12:23:21.3 |
HIP 101878 |
11.33 |
| 2026-06-21 00:00 |
20:38:43.36 |
+12:23:48.4 |
HIP 101878 |
10.50 |
| 2026-06-21 12:00 |
20:38:32.80 |
+12:24:14.4 |
HIP 101878 |
10.29 |
| 2026-06-22 00:00 |
20:38:22.15 |
+12:24:39.2 |
HIP 101783 |
9.82 |