| 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) |
| 2026-03-26 00:00 |
20:38:58.05 |
+07:57:54.6 |
HIP 101917 |
9.77 |
| 2026-03-26 12:00 |
20:39:08.62 |
+07:59:52.7 |
HIP 101917 |
11.37 |
| 2026-03-27 00:00 |
20:39:19.08 |
+08:01:51.0 |
HIP 101917 |
13.57 |
| 2026-03-27 12:00 |
20:39:29.43 |
+08:03:49.4 |
HIP 101917 |
16.14 |
| 2026-03-28 00:00 |
20:39:39.68 |
+08:05:47.8 |
HIP 101917 |
18.89 |
| 2026-03-28 12:00 |
20:39:49.81 |
+08:07:46.4 |
HIP 101979 |
19.21 |
| 2026-03-29 00:00 |
20:39:59.84 |
+08:09:45.0 |
HIP 101979 |
17.07 |
| 2026-03-29 12:00 |
20:40:09.76 |
+08:11:43.7 |
HIP 101979 |
15.29 |
| 2026-03-30 00:00 |
20:40:19.56 |
+08:13:42.5 |
HIP 101979 |
13.99 |
| 2026-03-30 12:00 |
20:40:29.26 |
+08:15:41.4 |
HIP 101979 |
13.30 |
| 2026-03-31 00:00 |
20:40:38.85 |
+08:17:40.3 |
HIP 101979 |
13.30 |
| 2026-03-31 12:00 |
20:40:48.32 |
+08:19:39.3 |
HIP 101979 |
13.97 |
| 2026-04-01 00:00 |
20:40:57.69 |
+08:21:38.3 |
HIP 101979 |
15.22 |
| 2026-04-01 12:00 |
20:41:06.94 |
+08:23:37.4 |
HIP 101979 |
16.90 |
| 2026-04-02 00:00 |
20:41:16.08 |
+08:25:36.5 |
HIP 102172 |
17.71 |
| 2026-04-02 12:00 |
20:41:25.11 |
+08:27:35.6 |
HIP 102172 |
14.72 |
| 2026-04-03 00:00 |
20:41:34.02 |
+08:29:34.7 |
HIP 102172 |
11.75 |
| 2026-04-03 12:00 |
20:41:42.82 |
+08:31:33.9 |
HIP 102172 |
8.81 |
| 2026-04-04 00:00 |
20:41:51.51 |
+08:33:33.1 |
HIP 102172 |
5.89 |
| 2026-04-04 12:00 |
20:42:00.08 |
+08:35:32.3 |
HIP 102172 |
3.00 |
| 2026-04-05 00:00 |
20:42:08.54 |
+08:37:31.5 |
HIP 102172 |
0.49 |
| 2026-04-05 12:00 |
20:42:16.88 |
+08:39:30.6 |
HIP 102172 |
2.83 |
| 2026-04-06 00:00 |
20:42:25.11 |
+08:41:29.8 |
HIP 102172 |
5.65 |
| 2026-04-06 12:00 |
20:42:33.22 |
+08:43:28.9 |
HIP 102172 |
8.47 |
| 2026-04-07 00:00 |
20:42:41.21 |
+08:45:28.1 |
HIP 102172 |
11.27 |
| 2026-04-07 12:00 |
20:42:49.09 |
+08:47:27.1 |
HIP 102172 |
14.04 |
| 2026-04-08 00:00 |
20:42:56.85 |
+08:49:26.2 |
HIP 102172 |
16.80 |
| 2026-04-08 12:00 |
20:43:04.49 |
+08:51:25.2 |
HIP 102296 |
17.63 |
| 2026-04-09 00:00 |
20:43:12.01 |
+08:53:24.1 |
HIP 102296 |
15.01 |
| 2026-04-09 12:00 |
20:43:19.42 |
+08:55:23.0 |
HIP 102296 |
12.45 |
| 2026-04-10 00:00 |
20:43:26.70 |
+08:57:21.8 |
HIP 102296 |
9.97 |
| 2026-04-10 12:00 |
20:43:33.86 |
+08:59:20.5 |
HIP 102296 |
7.63 |
| 2026-04-11 00:00 |
20:43:40.91 |
+09:01:19.2 |
HIP 102296 |
5.57 |
| 2026-04-11 12:00 |
20:43:47.83 |
+09:03:17.7 |
HIP 102296 |
4.20 |
| 2026-04-12 00:00 |
20:43:54.63 |
+09:05:16.2 |
HIP 102296 |
4.20 |
| 2026-04-12 12:00 |
20:44:01.31 |
+09:07:14.5 |
HIP 102296 |
5.55 |
| 2026-04-13 00:00 |
20:44:07.87 |
+09:09:12.8 |
HIP 102296 |
7.53 |
| 2026-04-13 12:00 |
20:44:14.31 |
+09:11:10.9 |
HIP 102296 |
9.75 |
| 2026-04-14 00:00 |
20:44:20.62 |
+09:13:08.9 |
HIP 102296 |
12.06 |
| 2026-04-14 12:00 |
20:44:26.81 |
+09:15:06.7 |
HIP 102296 |
14.41 |
| 2026-04-15 00:00 |
20:44:32.87 |
+09:17:04.4 |
HIP 102296 |
16.78 |
| 2026-04-15 12:00 |
20:44:38.82 |
+09:19:02.0 |
HIP 102296 |
19.15 |
| 2026-04-16 00:00 |
20:44:44.63 |
+09:20:59.4 |
HIP 102296 |
21.51 |