| Parameter |
Value |
| Designation |
52P/Harrington-Abell |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2014-03-07T08:33:30.715200Z |
| Orbit solution date (soln_date, UTC) |
2023-12-07T09:27:11Z |
| Obs used |
1164 |
| NEO |
- |
| M1 |
11.800 |
| K1 |
16.000 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2016-07-09.0000000 |
| e |
0.54004886 |
| q (au) |
1.775054 |
| a (au) |
3.859222 |
| i (deg) |
10.231762 |
| Ω (om, deg) |
336.835681 |
| ω (w, deg) |
139.660705 |
| M (ma, deg) |
111.106469 |
Magnitude
Scatter + Global Linear
$$
M_a = (11.377 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
11.377 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.989 |
| 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
Residuals (Piecewise)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| Start (UTC) |
End (UTC) |
a |
b |
| 2020-09-13 |
2022-02-27 |
+11.7519 |
-3.355 |
| 2022-02-27 |
2022-05-26 |
-2.1491 |
+1.106 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-03-26 00:00 |
21:18:22.36 |
-20:23:09.1 |
HIP 105181 |
3.16 |
| 2026-03-26 12:00 |
21:18:40.23 |
-20:21:52.1 |
HIP 105181 |
3.73 |
| 2026-03-27 00:00 |
21:18:58.01 |
-20:20:35.4 |
HIP 105181 |
7.48 |
| 2026-03-27 12:00 |
21:19:15.71 |
-20:19:19.2 |
HIP 105181 |
11.65 |
| 2026-03-28 00:00 |
21:19:33.31 |
-20:18:03.3 |
HIP 105181 |
15.88 |
| 2026-03-28 12:00 |
21:19:50.83 |
-20:16:47.8 |
HIP 105181 |
20.13 |
| 2026-03-29 00:00 |
21:20:08.25 |
-20:15:32.8 |
HIP 105181 |
24.37 |
| 2026-03-29 12:00 |
21:20:25.58 |
-20:14:18.2 |
HIP 105341 |
23.43 |
| 2026-03-30 00:00 |
21:20:42.82 |
-20:13:04.0 |
HIP 105341 |
23.06 |
| 2026-03-30 12:00 |
21:20:59.97 |
-20:11:50.2 |
HIP 105341 |
23.45 |
| 2026-03-31 00:00 |
21:21:17.02 |
-20:10:36.8 |
HIP 105341 |
24.56 |
| 2026-03-31 12:00 |
21:21:33.98 |
-20:09:23.9 |
HIP 105341 |
26.29 |
| 2026-04-01 00:00 |
21:21:50.85 |
-20:08:11.4 |
HIP 105341 |
28.51 |
| 2026-04-01 12:00 |
21:22:07.62 |
-20:06:59.3 |
HIP 105341 |
31.11 |
| 2026-04-02 00:00 |
21:22:24.29 |
-20:05:47.7 |
HIP 105604 |
28.29 |
| 2026-04-02 12:00 |
21:22:40.87 |
-20:04:36.5 |
HIP 105604 |
25.56 |
| 2026-04-03 00:00 |
21:22:57.35 |
-20:03:25.8 |
HIP 105604 |
23.24 |
| 2026-04-03 12:00 |
21:23:13.73 |
-20:02:15.6 |
HIP 105672 |
20.28 |
| 2026-04-04 00:00 |
21:23:30.01 |
-20:01:05.8 |
HIP 105672 |
16.91 |
| 2026-04-04 12:00 |
21:23:46.19 |
-19:59:56.4 |
HIP 105672 |
13.89 |
| 2026-04-05 00:00 |
21:24:02.27 |
-19:58:47.6 |
HIP 105672 |
11.49 |
| 2026-04-05 12:00 |
21:24:18.26 |
-19:57:39.2 |
HIP 105672 |
10.11 |
| 2026-04-06 00:00 |
21:24:34.13 |
-19:56:31.3 |
HIP 105672 |
10.16 |
| 2026-04-06 12:00 |
21:24:49.91 |
-19:55:23.8 |
HIP 105672 |
11.59 |
| 2026-04-07 00:00 |
21:25:05.59 |
-19:54:16.9 |
HIP 105672 |
13.97 |
| 2026-04-07 12:00 |
21:25:21.15 |
-19:53:10.4 |
HIP 105672 |
16.88 |
| 2026-04-08 00:00 |
21:25:36.62 |
-19:52:04.5 |
HIP 105672 |
20.07 |
| 2026-04-08 12:00 |
21:25:51.98 |
-19:50:59.0 |
HIP 105672 |
23.43 |
| 2026-04-09 00:00 |
21:26:07.23 |
-19:49:54.1 |
HIP 105672 |
26.87 |
| 2026-04-09 12:00 |
21:26:22.38 |
-19:48:49.7 |
HIP 105953 |
28.62 |
| 2026-04-10 00:00 |
21:26:37.42 |
-19:47:45.7 |
HIP 105953 |
27.80 |
| 2026-04-10 12:00 |
21:26:52.35 |
-19:46:42.3 |
HIP 105953 |
27.45 |
| 2026-04-11 00:00 |
21:27:07.16 |
-19:45:39.5 |
HIP 105924 |
26.99 |
| 2026-04-11 12:00 |
21:27:21.87 |
-19:44:37.1 |
HIP 105924 |
25.99 |
| 2026-04-12 00:00 |
21:27:36.47 |
-19:43:35.3 |
HIP 106070 |
23.67 |
| 2026-04-12 12:00 |
21:27:50.96 |
-19:42:34.1 |
HIP 106070 |
20.19 |
| 2026-04-13 00:00 |
21:28:05.33 |
-19:41:33.4 |
HIP 106070 |
16.78 |
| 2026-04-13 12:00 |
21:28:19.59 |
-19:40:33.2 |
HIP 106070 |
13.45 |
| 2026-04-14 00:00 |
21:28:33.74 |
-19:39:33.6 |
HIP 106070 |
10.26 |
| 2026-04-14 12:00 |
21:28:47.77 |
-19:38:34.6 |
HIP 106070 |
7.36 |
| 2026-04-15 00:00 |
21:29:01.68 |
-19:37:36.1 |
HIP 106070 |
5.20 |
| 2026-04-15 12:00 |
21:29:15.48 |
-19:36:38.2 |
HIP 106070 |
4.82 |
| 2026-04-16 00:00 |
21:29:29.16 |
-19:35:40.9 |
HIP 106070 |
6.49 |