| Parameter |
Value |
| Designation |
C/2018 E2 (Barros) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2017-12-23T16:27:32.230080Z |
| Orbit solution date (soln_date, UTC) |
2022-07-06T03:12:21Z |
| Obs used |
62 |
| NEO |
- |
| M1 |
9.900 |
| K1 |
10.250 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2018-03-12T22:14:13.056000Z |
| Discovery magnitude (MPC) |
19.40 T |
| Discovery observatory (MPC) |
Y00 · SONEAR Observatory, Oliveira |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2018-03-25.0000000 |
| e |
0.99760072 |
| q (au) |
3.922284 |
| a (au) |
1634.776323 |
| i (deg) |
97.742513 |
| Ω (om, deg) |
67.202099 |
| ω (w, deg) |
277.481389 |
| M (ma, deg) |
0.001362 |
Magnitude
Scatter + Global Linear
$$
M_a = (6.323 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
6.323 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.968 |
| k |
1.000 |
| 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 |
02:22:28.52 |
+60:14:39.7 |
HIP 11188 |
12.92 |
| 2026-03-26 12:00 |
02:22:36.87 |
+60:14:31.5 |
HIP 11188 |
12.02 |
| 2026-03-27 00:00 |
02:22:45.26 |
+60:14:23.9 |
HIP 11188 |
11.13 |
| 2026-03-27 12:00 |
02:22:53.69 |
+60:14:16.8 |
HIP 11188 |
10.26 |
| 2026-03-28 00:00 |
02:23:02.17 |
+60:14:10.3 |
HIP 11188 |
9.42 |
| 2026-03-28 12:00 |
02:23:10.69 |
+60:14:04.2 |
HIP 11188 |
8.62 |
| 2026-03-29 00:00 |
02:23:19.25 |
+60:13:58.7 |
HIP 11188 |
7.87 |
| 2026-03-29 12:00 |
02:23:27.85 |
+60:13:53.7 |
HIP 11188 |
7.19 |
| 2026-03-30 00:00 |
02:23:36.50 |
+60:13:49.2 |
HIP 11188 |
6.61 |
| 2026-03-30 12:00 |
02:23:45.18 |
+60:13:45.2 |
HIP 11188 |
6.15 |
| 2026-03-31 00:00 |
02:23:53.90 |
+60:13:41.8 |
HIP 11188 |
5.84 |
| 2026-03-31 12:00 |
02:24:02.66 |
+60:13:38.9 |
HIP 11188 |
5.71 |
| 2026-04-01 00:00 |
02:24:11.46 |
+60:13:36.5 |
HIP 11188 |
5.79 |
| 2026-04-01 12:00 |
02:24:20.30 |
+60:13:34.6 |
HIP 11188 |
6.05 |
| 2026-04-02 00:00 |
02:24:29.17 |
+60:13:33.3 |
HIP 11188 |
6.49 |
| 2026-04-02 12:00 |
02:24:38.08 |
+60:13:32.4 |
HIP 11188 |
7.06 |
| 2026-04-03 00:00 |
02:24:47.03 |
+60:13:32.1 |
HIP 11188 |
7.75 |
| 2026-04-03 12:00 |
02:24:56.01 |
+60:13:32.3 |
HIP 11188 |
8.53 |
| 2026-04-04 00:00 |
02:25:05.02 |
+60:13:33.0 |
HIP 11188 |
9.37 |
| 2026-04-04 12:00 |
02:25:14.07 |
+60:13:34.3 |
HIP 11188 |
10.26 |
| 2026-04-05 00:00 |
02:25:23.16 |
+60:13:36.0 |
HIP 11188 |
11.20 |
| 2026-04-05 12:00 |
02:25:32.27 |
+60:13:38.3 |
HIP 11188 |
12.16 |
| 2026-04-06 00:00 |
02:25:41.42 |
+60:13:41.1 |
HIP 11188 |
13.15 |
| 2026-04-06 12:00 |
02:25:50.60 |
+60:13:44.4 |
HIP 11295 |
13.75 |
| 2026-04-07 00:00 |
02:25:59.81 |
+60:13:48.2 |
HIP 11295 |
14.10 |
| 2026-04-07 12:00 |
02:26:09.06 |
+60:13:52.6 |
HIP 11295 |
14.55 |
| 2026-04-08 00:00 |
02:26:18.33 |
+60:13:57.4 |
HIP 11295 |
15.08 |
| 2026-04-08 12:00 |
02:26:27.63 |
+60:14:02.8 |
HIP 11295 |
15.69 |
| 2026-04-09 00:00 |
02:26:36.96 |
+60:14:08.7 |
HIP 11295 |
16.36 |
| 2026-04-09 12:00 |
02:26:46.32 |
+60:14:15.1 |
HIP 11295 |
17.10 |
| 2026-04-10 00:00 |
02:26:55.71 |
+60:14:22.0 |
HIP 11295 |
17.90 |
| 2026-04-10 12:00 |
02:27:05.12 |
+60:14:29.4 |
HIP 11295 |
18.74 |
| 2026-04-11 00:00 |
02:27:14.56 |
+60:14:37.3 |
HIP 11295 |
19.63 |
| 2026-04-11 12:00 |
02:27:24.03 |
+60:14:45.8 |
HIP 11295 |
20.55 |
| 2026-04-12 00:00 |
02:27:33.52 |
+60:14:54.7 |
HIP 11295 |
21.51 |
| 2026-04-12 12:00 |
02:27:43.04 |
+60:15:04.2 |
HIP 11295 |
22.50 |
| 2026-04-13 00:00 |
02:27:52.58 |
+60:15:14.2 |
HIP 11295 |
23.51 |
| 2026-04-13 12:00 |
02:28:02.14 |
+60:15:24.7 |
HIP 11295 |
24.55 |
| 2026-04-14 00:00 |
02:28:11.73 |
+60:15:35.6 |
HIP 11294 |
25.57 |
| 2026-04-14 12:00 |
02:28:21.34 |
+60:15:47.1 |
HIP 11604 |
25.46 |
| 2026-04-15 00:00 |
02:28:30.97 |
+60:15:59.2 |
HIP 11604 |
24.85 |
| 2026-04-15 12:00 |
02:28:40.63 |
+60:16:11.7 |
HIP 11604 |
24.28 |
| 2026-04-16 00:00 |
02:28:50.30 |
+60:16:24.7 |
HIP 11604 |
23.76 |