C/1952 Q1 (Harrington)
| Parameter |
Value |
| Designation |
C/1952 Q1 (Harrington) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1953-01-05T10:10:01.139520Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:10Z |
| Obs used |
5 |
| NEO |
- |
| M1 |
- |
| K1 |
- |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1952-11-27.0000000 |
| e |
0.99595292 |
| q (au) |
1.664987 |
| a (au) |
411.404751 |
| i (deg) |
59.116673 |
| Ω (om, deg) |
221.391261 |
| ω (w, deg) |
191.629595 |
| M (ma, deg) |
359.995344 |
Magnitude
Scatter + Global Linear
$$
M_a = (6.130 + 3.003\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
6.130 |
| n |
3.003 |
| gf |
1.000 |
| gb |
-0.998 |
| 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 |
| 1952-10-10 |
1952-12-20 |
+24.3360 |
-5.080 |
| 1953-01-05 |
1953-05-08 |
+0.2446 |
-1.035 |
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 |
14:30:03.53 |
-17:08:35.6 |
HIP 70801 |
18.92 |
| 2026-02-03 12:00 |
14:30:03.47 |
-17:08:35.7 |
HIP 70801 |
18.91 |
| 2026-02-04 00:00 |
14:30:03.39 |
-17:08:35.8 |
HIP 70801 |
18.89 |
| 2026-02-04 12:00 |
14:30:03.31 |
-17:08:35.9 |
HIP 70801 |
18.87 |
| 2026-02-05 00:00 |
14:30:03.21 |
-17:08:35.9 |
HIP 70801 |
18.85 |
| 2026-02-05 12:00 |
14:30:03.10 |
-17:08:35.8 |
HIP 70801 |
18.83 |
| 2026-02-06 00:00 |
14:30:02.98 |
-17:08:35.7 |
HIP 70801 |
18.80 |
| 2026-02-06 12:00 |
14:30:02.85 |
-17:08:35.5 |
HIP 70801 |
18.77 |
| 2026-02-07 00:00 |
14:30:02.71 |
-17:08:35.3 |
HIP 70801 |
18.73 |
| 2026-02-07 12:00 |
14:30:02.56 |
-17:08:35.0 |
HIP 70801 |
18.70 |
| 2026-02-08 00:00 |
14:30:02.40 |
-17:08:34.7 |
HIP 70801 |
18.66 |
| 2026-02-08 12:00 |
14:30:02.22 |
-17:08:34.3 |
HIP 70801 |
18.62 |
| 2026-02-09 00:00 |
14:30:02.04 |
-17:08:33.9 |
HIP 70801 |
18.57 |
| 2026-02-09 12:00 |
14:30:01.84 |
-17:08:33.4 |
HIP 70801 |
18.52 |
| 2026-02-10 00:00 |
14:30:01.64 |
-17:08:32.9 |
HIP 70801 |
18.47 |
| 2026-02-10 12:00 |
14:30:01.42 |
-17:08:32.3 |
HIP 70801 |
18.42 |
| 2026-02-11 00:00 |
14:30:01.19 |
-17:08:31.6 |
HIP 70801 |
18.36 |
| 2026-02-11 12:00 |
14:30:00.95 |
-17:08:30.9 |
HIP 70801 |
18.31 |
| 2026-02-12 00:00 |
14:30:00.70 |
-17:08:30.2 |
HIP 70801 |
18.25 |
| 2026-02-12 12:00 |
14:30:00.44 |
-17:08:29.4 |
HIP 70801 |
18.18 |
| 2026-02-13 00:00 |
14:30:00.17 |
-17:08:28.5 |
HIP 70801 |
18.11 |
| 2026-02-13 12:00 |
14:29:59.88 |
-17:08:27.6 |
HIP 70801 |
18.05 |
| 2026-02-14 00:00 |
14:29:59.59 |
-17:08:26.6 |
HIP 70801 |
17.97 |
| 2026-02-14 12:00 |
14:29:59.29 |
-17:08:25.6 |
HIP 70801 |
17.90 |
| 2026-02-15 00:00 |
14:29:58.97 |
-17:08:24.5 |
HIP 70801 |
17.82 |
| 2026-02-15 12:00 |
14:29:58.64 |
-17:08:23.4 |
HIP 70801 |
17.74 |
| 2026-02-16 00:00 |
14:29:58.31 |
-17:08:22.2 |
HIP 70801 |
17.66 |
| 2026-02-16 12:00 |
14:29:57.96 |
-17:08:21.0 |
HIP 70801 |
17.57 |
| 2026-02-17 00:00 |
14:29:57.60 |
-17:08:19.7 |
HIP 70801 |
17.48 |
| 2026-02-17 12:00 |
14:29:57.23 |
-17:08:18.4 |
HIP 70801 |
17.39 |
| 2026-02-18 00:00 |
14:29:56.85 |
-17:08:17.0 |
HIP 70801 |
17.30 |
| 2026-02-18 12:00 |
14:29:56.46 |
-17:08:15.5 |
HIP 70801 |
17.20 |
| 2026-02-19 00:00 |
14:29:56.06 |
-17:08:14.0 |
HIP 70801 |
17.10 |
| 2026-02-19 12:00 |
14:29:55.65 |
-17:08:12.5 |
HIP 70801 |
17.00 |
| 2026-02-20 00:00 |
14:29:55.22 |
-17:08:10.9 |
HIP 70801 |
16.90 |
| 2026-02-20 12:00 |
14:29:54.79 |
-17:08:09.2 |
HIP 70801 |
16.79 |
| 2026-02-21 00:00 |
14:29:54.35 |
-17:08:07.5 |
HIP 70801 |
16.68 |
| 2026-02-21 12:00 |
14:29:53.90 |
-17:08:05.8 |
HIP 70801 |
16.57 |
| 2026-02-22 00:00 |
14:29:53.43 |
-17:08:03.9 |
HIP 70801 |
16.46 |
| 2026-02-22 12:00 |
14:29:52.96 |
-17:08:02.1 |
HIP 70801 |
16.34 |
| 2026-02-23 00:00 |
14:29:52.47 |
-17:08:00.2 |
HIP 70801 |
16.22 |
| 2026-02-23 12:00 |
14:29:51.98 |
-17:07:58.2 |
HIP 70801 |
16.10 |
| 2026-02-24 00:00 |
14:29:51.47 |
-17:07:56.2 |
HIP 70801 |
15.97 |