52P/Harrington-Abell
| 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) |
| 2026-02-03 00:00 |
20:42:24.49 |
-22:55:44.7 |
HIP 102175 |
5.26 |
| 2026-02-03 12:00 |
20:42:47.65 |
-22:54:09.2 |
HIP 102175 |
10.20 |
| 2026-02-04 00:00 |
20:43:10.79 |
-22:52:33.7 |
HIP 102175 |
15.57 |
| 2026-02-04 12:00 |
20:43:33.92 |
-22:50:58.2 |
HIP 102175 |
21.04 |
| 2026-02-05 00:00 |
20:43:57.02 |
-22:49:22.7 |
HIP 102280 |
23.24 |
| 2026-02-05 12:00 |
20:44:20.11 |
-22:47:47.2 |
HIP 102280 |
24.00 |
| 2026-02-06 00:00 |
20:44:43.19 |
-22:46:11.7 |
HIP 102280 |
25.95 |
| 2026-02-06 12:00 |
20:45:06.24 |
-22:44:36.2 |
HIP 102495 |
26.12 |
| 2026-02-07 00:00 |
20:45:29.27 |
-22:43:00.8 |
HIP 102495 |
24.52 |
| 2026-02-07 12:00 |
20:45:52.29 |
-22:41:25.3 |
HIP 102495 |
24.11 |
| 2026-02-08 00:00 |
20:46:15.28 |
-22:39:49.9 |
HIP 102495 |
24.96 |
| 2026-02-08 12:00 |
20:46:38.25 |
-22:38:14.5 |
HIP 102675 |
24.66 |
| 2026-02-09 00:00 |
20:47:01.19 |
-22:36:39.2 |
HIP 102675 |
20.14 |
| 2026-02-09 12:00 |
20:47:24.12 |
-22:35:03.8 |
HIP 102675 |
16.26 |
| 2026-02-10 00:00 |
20:47:47.02 |
-22:33:28.5 |
HIP 102675 |
13.56 |
| 2026-02-10 12:00 |
20:48:09.89 |
-22:31:53.2 |
HIP 102675 |
12.83 |
| 2026-02-11 00:00 |
20:48:32.74 |
-22:30:18.0 |
HIP 102675 |
14.34 |
| 2026-02-11 12:00 |
20:48:55.56 |
-22:28:42.8 |
HIP 102675 |
17.53 |
| 2026-02-12 00:00 |
20:49:18.36 |
-22:27:07.7 |
HIP 102675 |
21.67 |
| 2026-02-12 12:00 |
20:49:41.12 |
-22:25:32.6 |
HIP 102675 |
26.30 |
| 2026-02-13 00:00 |
20:50:03.86 |
-22:23:57.5 |
HIP 102930 |
29.16 |
| 2026-02-13 12:00 |
20:50:26.57 |
-22:22:22.6 |
HIP 102930 |
25.21 |
| 2026-02-14 00:00 |
20:50:49.25 |
-22:20:47.6 |
HIP 102930 |
21.95 |
| 2026-02-14 12:00 |
20:51:11.90 |
-22:19:12.8 |
HIP 102930 |
19.69 |
| 2026-02-15 00:00 |
20:51:34.52 |
-22:17:38.0 |
HIP 102930 |
18.81 |
| 2026-02-15 12:00 |
20:51:57.10 |
-22:16:03.3 |
HIP 102930 |
19.48 |
| 2026-02-16 00:00 |
20:52:19.65 |
-22:14:28.6 |
HIP 102930 |
21.56 |
| 2026-02-16 12:00 |
20:52:42.17 |
-22:12:54.1 |
HIP 102948 |
24.63 |
| 2026-02-17 00:00 |
20:53:04.65 |
-22:11:19.6 |
HIP 102948 |
27.57 |
| 2026-02-17 12:00 |
20:53:27.10 |
-22:09:45.2 |
HIP 103274 |
25.94 |
| 2026-02-18 00:00 |
20:53:49.51 |
-22:08:10.9 |
HIP 103274 |
20.66 |
| 2026-02-18 12:00 |
20:54:11.88 |
-22:06:36.7 |
HIP 103274 |
15.49 |
| 2026-02-19 00:00 |
20:54:34.22 |
-22:05:02.6 |
HIP 103274 |
10.57 |
| 2026-02-19 12:00 |
20:54:56.51 |
-22:03:28.6 |
HIP 103274 |
6.47 |
| 2026-02-20 00:00 |
20:55:18.77 |
-22:01:54.7 |
HIP 103274 |
5.51 |
| 2026-02-20 12:00 |
20:55:40.99 |
-22:00:21.0 |
HIP 103274 |
8.76 |
| 2026-02-21 00:00 |
20:56:03.16 |
-21:58:47.3 |
HIP 103398 |
11.60 |
| 2026-02-21 12:00 |
20:56:25.30 |
-21:57:13.8 |
HIP 103398 |
7.08 |
| 2026-02-22 00:00 |
20:56:47.39 |
-21:55:40.3 |
HIP 103398 |
4.83 |
| 2026-02-22 12:00 |
20:57:09.43 |
-21:54:07.0 |
HIP 103398 |
7.33 |
| 2026-02-23 00:00 |
20:57:31.44 |
-21:52:33.9 |
HIP 103398 |
11.88 |
| 2026-02-23 12:00 |
20:57:53.40 |
-21:51:00.9 |
HIP 103398 |
16.88 |
| 2026-02-24 00:00 |
20:58:15.31 |
-21:49:28.0 |
HIP 103469 |
17.40 |