| 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) |
| 2026-05-12 00:00 |
04:21:14.48 |
+15:20:14.7 |
HIP 20261 |
17.20 |
| 2026-05-12 12:00 |
04:21:32.69 |
+15:20:54.4 |
HIP 20261 |
20.39 |
| 2026-05-13 00:00 |
04:21:50.91 |
+15:21:33.9 |
HIP 20440 |
22.27 |
| 2026-05-13 12:00 |
04:22:09.16 |
+15:22:13.2 |
HIP 20440 |
20.65 |
| 2026-05-14 00:00 |
04:22:27.42 |
+15:22:52.2 |
HIP 20440 |
19.91 |
| 2026-05-14 12:00 |
04:22:45.69 |
+15:23:31.0 |
HIP 20440 |
20.15 |
| 2026-05-15 00:00 |
04:23:03.99 |
+15:24:09.6 |
HIP 20440 |
21.34 |
| 2026-05-15 12:00 |
04:23:22.30 |
+15:24:47.9 |
HIP 20485 |
21.00 |
| 2026-05-16 00:00 |
04:23:40.62 |
+15:25:26.0 |
HIP 20485 |
20.69 |
| 2026-05-16 12:00 |
04:23:58.96 |
+15:26:03.8 |
HIP 20485 |
21.34 |
| 2026-05-17 00:00 |
04:24:17.32 |
+15:26:41.4 |
HIP 20485 |
22.85 |
| 2026-05-17 12:00 |
04:24:35.68 |
+15:27:18.8 |
HIP 20485 |
25.09 |
| 2026-05-18 00:00 |
04:24:54.06 |
+15:27:55.9 |
HIP 20713 |
22.79 |
| 2026-05-18 12:00 |
04:25:12.45 |
+15:28:32.8 |
HIP 20713 |
18.52 |
| 2026-05-19 00:00 |
04:25:30.85 |
+15:29:09.4 |
HIP 20713 |
14.39 |
| 2026-05-19 12:00 |
04:25:49.26 |
+15:29:45.8 |
HIP 20713 |
10.54 |
| 2026-05-20 00:00 |
04:26:07.68 |
+15:30:21.9 |
HIP 20713 |
7.43 |
| 2026-05-20 12:00 |
04:26:26.11 |
+15:30:57.8 |
HIP 20713 |
6.28 |
| 2026-05-21 00:00 |
04:26:44.55 |
+15:31:33.4 |
HIP 20713 |
7.99 |
| 2026-05-21 12:00 |
04:27:02.99 |
+15:32:08.7 |
HIP 20815 |
8.53 |
| 2026-05-22 00:00 |
04:27:21.45 |
+15:32:43.8 |
HIP 20815 |
4.35 |
| 2026-05-22 12:00 |
04:27:39.91 |
+15:33:18.6 |
HIP 20815 |
2.27 |
| 2026-05-23 00:00 |
04:27:58.37 |
+15:33:53.1 |
HIP 20815 |
5.62 |
| 2026-05-23 12:00 |
04:28:16.84 |
+15:34:27.4 |
HIP 20815 |
9.92 |
| 2026-05-24 00:00 |
04:28:35.31 |
+15:35:01.5 |
HIP 20815 |
14.33 |
| 2026-05-24 12:00 |
04:28:53.79 |
+15:35:35.2 |
HIP 20894 |
17.01 |
| 2026-05-25 00:00 |
04:29:12.27 |
+15:36:08.7 |
HIP 20995 |
13.71 |
| 2026-05-25 12:00 |
04:29:30.76 |
+15:36:41.9 |
HIP 20995 |
9.23 |
| 2026-05-26 00:00 |
04:29:49.24 |
+15:37:14.9 |
HIP 20995 |
4.76 |
| 2026-05-26 12:00 |
04:30:07.73 |
+15:37:47.5 |
HIP 20995 |
0.52 |
| 2026-05-27 00:00 |
04:30:26.22 |
+15:38:19.9 |
HIP 20995 |
4.26 |
| 2026-05-27 12:00 |
04:30:44.71 |
+15:38:52.0 |
HIP 21039 |
3.00 |
| 2026-05-28 00:00 |
04:31:03.20 |
+15:39:23.9 |
HIP 21039 |
6.24 |
| 2026-05-28 12:00 |
04:31:21.69 |
+15:39:55.4 |
HIP 21039 |
10.44 |
| 2026-05-29 00:00 |
04:31:40.18 |
+15:40:26.7 |
HIP 21138 |
10.88 |
| 2026-05-29 12:00 |
04:31:58.66 |
+15:40:57.7 |
HIP 21137 |
10.27 |
| 2026-05-30 00:00 |
04:32:17.15 |
+15:41:28.5 |
HIP 21137 |
11.41 |
| 2026-05-30 12:00 |
04:32:35.63 |
+15:41:58.9 |
HIP 21137 |
13.96 |
| 2026-05-31 00:00 |
04:32:54.11 |
+15:42:29.1 |
HIP 21137 |
17.31 |
| 2026-05-31 12:00 |
04:33:12.58 |
+15:42:59.0 |
HIP 21137 |
21.08 |
| 2026-06-01 00:00 |
04:33:31.05 |
+15:43:28.5 |
HIP 21317 |
20.32 |
| 2026-06-01 12:00 |
04:33:49.52 |
+15:43:57.8 |
HIP 21317 |
17.56 |
| 2026-06-02 00:00 |
04:34:07.98 |
+15:44:26.9 |
HIP 21317 |
15.61 |