| Parameter |
Value |
| Designation |
C/2023 RN3 (ATLAS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2023-01-18T00:08:18.320640Z |
| Orbit solution date (soln_date, UTC) |
2025-09-16T12:42:50Z |
| Obs used |
637 |
| NEO |
- |
| M1 |
6.500 |
| K1 |
11.250 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2023-11-02.0000000 |
| e |
0.49041086 |
| q (au) |
5.172310 |
| a (au) |
10.149962 |
| i (deg) |
10.358010 |
| Ω (om, deg) |
207.067405 |
| ω (w, deg) |
130.302280 |
| M (ma, deg) |
8.777913 |
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
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-03-26 00:00 |
03:55:33.25 |
+14:07:14.2 |
HIP 18274 |
25.50 |
| 2026-03-26 12:00 |
03:55:46.96 |
+14:08:03.2 |
HIP 18274 |
28.15 |
| 2026-03-27 00:00 |
03:56:00.74 |
+14:08:52.3 |
HIP 18274 |
30.97 |
| 2026-03-27 12:00 |
03:56:14.60 |
+14:09:41.5 |
HIP 18551 |
28.74 |
| 2026-03-28 00:00 |
03:56:28.54 |
+14:10:30.6 |
HIP 18551 |
25.33 |
| 2026-03-28 12:00 |
03:56:42.55 |
+14:11:19.9 |
HIP 18551 |
21.93 |
| 2026-03-29 00:00 |
03:56:56.63 |
+14:12:09.1 |
HIP 18551 |
18.54 |
| 2026-03-29 12:00 |
03:57:10.79 |
+14:12:58.4 |
HIP 18551 |
15.18 |
| 2026-03-30 00:00 |
03:57:25.03 |
+14:13:47.7 |
HIP 18551 |
11.91 |
| 2026-03-30 12:00 |
03:57:39.33 |
+14:14:37.1 |
HIP 18551 |
8.84 |
| 2026-03-31 00:00 |
03:57:53.71 |
+14:15:26.4 |
HIP 18551 |
6.30 |
| 2026-03-31 12:00 |
03:58:08.16 |
+14:16:15.8 |
HIP 18551 |
5.18 |
| 2026-04-01 00:00 |
03:58:22.68 |
+14:17:05.2 |
HIP 18551 |
6.32 |
| 2026-04-01 12:00 |
03:58:37.27 |
+14:17:54.6 |
HIP 18551 |
8.91 |
| 2026-04-02 00:00 |
03:58:51.93 |
+14:18:44.0 |
HIP 18551 |
12.06 |
| 2026-04-02 12:00 |
03:59:06.66 |
+14:19:33.4 |
HIP 18551 |
15.44 |
| 2026-04-03 00:00 |
03:59:21.46 |
+14:20:22.8 |
HIP 18692 |
13.51 |
| 2026-04-03 12:00 |
03:59:36.32 |
+14:21:12.2 |
HIP 18692 |
10.17 |
| 2026-04-04 00:00 |
03:59:51.25 |
+14:22:01.6 |
HIP 18692 |
7.16 |
| 2026-04-04 12:00 |
04:00:06.25 |
+14:22:51.0 |
HIP 18692 |
5.15 |
| 2026-04-05 00:00 |
04:00:21.31 |
+14:23:40.4 |
HIP 18692 |
5.44 |
| 2026-04-05 12:00 |
04:00:36.44 |
+14:24:29.8 |
HIP 18692 |
7.79 |
| 2026-04-06 00:00 |
04:00:51.64 |
+14:25:19.1 |
HIP 18692 |
10.97 |
| 2026-04-06 12:00 |
04:01:06.90 |
+14:26:08.4 |
HIP 18692 |
14.45 |
| 2026-04-07 00:00 |
04:01:22.22 |
+14:26:57.7 |
HIP 18692 |
18.07 |
| 2026-04-07 12:00 |
04:01:37.60 |
+14:27:47.0 |
HIP 18902 |
21.57 |
| 2026-04-08 00:00 |
04:01:53.05 |
+14:28:36.2 |
HIP 18902 |
17.80 |
| 2026-04-08 12:00 |
04:02:08.56 |
+14:29:25.4 |
HIP 18902 |
14.05 |
| 2026-04-09 00:00 |
04:02:24.13 |
+14:30:14.6 |
HIP 18902 |
10.35 |
| 2026-04-09 12:00 |
04:02:39.76 |
+14:31:03.7 |
HIP 18902 |
6.81 |
| 2026-04-10 00:00 |
04:02:55.45 |
+14:31:52.8 |
HIP 18902 |
3.94 |
| 2026-04-10 12:00 |
04:03:11.20 |
+14:32:41.8 |
HIP 18902 |
3.86 |
| 2026-04-11 00:00 |
04:03:27.00 |
+14:33:30.8 |
HIP 18902 |
6.69 |
| 2026-04-11 12:00 |
04:03:42.87 |
+14:34:19.7 |
HIP 18902 |
10.27 |
| 2026-04-12 00:00 |
04:03:58.79 |
+14:35:08.5 |
HIP 18902 |
14.05 |
| 2026-04-12 12:00 |
04:04:14.77 |
+14:35:57.3 |
HIP 18902 |
17.91 |
| 2026-04-13 00:00 |
04:04:30.81 |
+14:36:46.1 |
HIP 18902 |
21.81 |
| 2026-04-13 12:00 |
04:04:46.90 |
+14:37:34.7 |
HIP 19085 |
23.03 |
| 2026-04-14 00:00 |
04:05:03.05 |
+14:38:23.3 |
HIP 19085 |
22.27 |
| 2026-04-14 12:00 |
04:05:19.25 |
+14:39:11.8 |
HIP 19157 |
21.54 |
| 2026-04-15 00:00 |
04:05:35.51 |
+14:40:00.2 |
HIP 19157 |
19.58 |
| 2026-04-15 12:00 |
04:05:51.82 |
+14:40:48.6 |
HIP 19157 |
18.30 |
| 2026-04-16 00:00 |
04:06:08.18 |
+14:41:36.9 |
HIP 19157 |
17.85 |