C/1977 D1 (Lovas)
| Parameter |
Value |
| Designation |
C/1977 D1 (Lovas) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1976-11-01T07:57:55.978560Z |
| Orbit solution date (soln_date, UTC) |
2023-08-28T01:42:37Z |
| Obs used |
30 |
| NEO |
- |
| M1 |
5.000 |
| K1 |
10.000 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1977-05-05.0000000 |
| e |
1.00340358 |
| q (au) |
5.715993 |
| a (au) |
-1679.405282 |
| i (deg) |
64.522285 |
| Ω (om, deg) |
338.172768 |
| ω (w, deg) |
146.312104 |
| M (ma, deg) |
0.002645 |
Magnitude
Scatter + Global Linear
$$
M_a = (14.198 + 2.119\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
14.198 |
| n |
2.119 |
| gf |
0.800 |
| gb |
-0.900 |
| k |
0.800 |
| δ90 |
9.972 |
| 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) |
| 2026-02-03 00:00 |
21:47:06.17 |
-74:18:52.0 |
HIP 107265 |
23.50 |
| 2026-02-03 12:00 |
21:47:12.05 |
-74:18:42.6 |
HIP 107265 |
23.63 |
| 2026-02-04 00:00 |
21:47:17.93 |
-74:18:33.4 |
HIP 107265 |
23.77 |
| 2026-02-04 12:00 |
21:47:23.83 |
-74:18:24.4 |
HIP 107265 |
23.91 |
| 2026-02-05 00:00 |
21:47:29.73 |
-74:18:15.6 |
HIP 107265 |
24.07 |
| 2026-02-05 12:00 |
21:47:35.63 |
-74:18:06.9 |
HIP 108010 |
23.79 |
| 2026-02-06 00:00 |
21:47:41.55 |
-74:17:58.4 |
HIP 108010 |
23.37 |
| 2026-02-06 12:00 |
21:47:47.46 |
-74:17:50.1 |
HIP 108010 |
22.95 |
| 2026-02-07 00:00 |
21:47:53.39 |
-74:17:41.9 |
HIP 108010 |
22.53 |
| 2026-02-07 12:00 |
21:47:59.31 |
-74:17:34.0 |
HIP 108010 |
22.10 |
| 2026-02-08 00:00 |
21:48:05.25 |
-74:17:26.2 |
HIP 108010 |
21.68 |
| 2026-02-08 12:00 |
21:48:11.18 |
-74:17:18.6 |
HIP 108010 |
21.27 |
| 2026-02-09 00:00 |
21:48:17.12 |
-74:17:11.2 |
HIP 108010 |
20.85 |
| 2026-02-09 12:00 |
21:48:23.07 |
-74:17:03.9 |
HIP 108010 |
20.43 |
| 2026-02-10 00:00 |
21:48:29.01 |
-74:16:56.9 |
HIP 108010 |
20.01 |
| 2026-02-10 12:00 |
21:48:34.96 |
-74:16:50.0 |
HIP 108010 |
19.60 |
| 2026-02-11 00:00 |
21:48:40.91 |
-74:16:43.3 |
HIP 108010 |
19.19 |
| 2026-02-11 12:00 |
21:48:46.86 |
-74:16:36.7 |
HIP 108010 |
18.78 |
| 2026-02-12 00:00 |
21:48:52.82 |
-74:16:30.4 |
HIP 108010 |
18.36 |
| 2026-02-12 12:00 |
21:48:58.77 |
-74:16:24.2 |
HIP 108010 |
17.96 |
| 2026-02-13 00:00 |
21:49:04.73 |
-74:16:18.3 |
HIP 108010 |
17.55 |
| 2026-02-13 12:00 |
21:49:10.68 |
-74:16:12.5 |
HIP 108010 |
17.14 |
| 2026-02-14 00:00 |
21:49:16.64 |
-74:16:06.9 |
HIP 108010 |
16.74 |
| 2026-02-14 12:00 |
21:49:22.59 |
-74:16:01.4 |
HIP 108010 |
16.34 |
| 2026-02-15 00:00 |
21:49:28.54 |
-74:15:56.2 |
HIP 108010 |
15.94 |
| 2026-02-15 12:00 |
21:49:34.49 |
-74:15:51.1 |
HIP 108010 |
15.54 |
| 2026-02-16 00:00 |
21:49:40.44 |
-74:15:46.3 |
HIP 108010 |
15.15 |
| 2026-02-16 12:00 |
21:49:46.39 |
-74:15:41.6 |
HIP 108010 |
14.75 |
| 2026-02-17 00:00 |
21:49:52.34 |
-74:15:37.1 |
HIP 108010 |
14.36 |
| 2026-02-17 12:00 |
21:49:58.28 |
-74:15:32.7 |
HIP 108010 |
13.98 |
| 2026-02-18 00:00 |
21:50:04.21 |
-74:15:28.6 |
HIP 108010 |
13.59 |
| 2026-02-18 12:00 |
21:50:10.15 |
-74:15:24.7 |
HIP 108010 |
13.21 |
| 2026-02-19 00:00 |
21:50:16.08 |
-74:15:20.9 |
HIP 108010 |
12.84 |
| 2026-02-19 12:00 |
21:50:22.00 |
-74:15:17.3 |
HIP 108010 |
12.46 |
| 2026-02-20 00:00 |
21:50:27.92 |
-74:15:14.0 |
HIP 108010 |
12.10 |
| 2026-02-20 12:00 |
21:50:33.84 |
-74:15:10.8 |
HIP 108010 |
11.73 |
| 2026-02-21 00:00 |
21:50:39.74 |
-74:15:07.8 |
HIP 108010 |
11.37 |
| 2026-02-21 12:00 |
21:50:45.65 |
-74:15:04.9 |
HIP 108010 |
11.02 |
| 2026-02-22 00:00 |
21:50:51.54 |
-74:15:02.3 |
HIP 108010 |
10.67 |
| 2026-02-22 12:00 |
21:50:57.43 |
-74:14:59.8 |
HIP 108010 |
10.33 |
| 2026-02-23 00:00 |
21:51:03.31 |
-74:14:57.6 |
HIP 108010 |
9.99 |
| 2026-02-23 12:00 |
21:51:09.18 |
-74:14:55.5 |
HIP 108010 |
9.67 |
| 2026-02-24 00:00 |
21:51:15.04 |
-74:14:53.6 |
HIP 108010 |
9.35 |