| Parameter |
Value |
| Designation |
277P/LINEAR |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2013-06-04T19:48:10.031040Z |
| Orbit solution date (soln_date, UTC) |
2021-05-02T23:43:01Z |
| Obs used |
828 |
| NEO |
- |
| M1 |
11.800 |
| K1 |
19.500 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2016-09-16.0000000 |
| e |
0.50379346 |
| q (au) |
1.914197 |
| a (au) |
3.857662 |
| i (deg) |
16.748332 |
| Ω (om, deg) |
276.352145 |
| ω (w, deg) |
152.176271 |
| M (ma, deg) |
155.991309 |
Magnitude
Scatter + Global Linear
$$
M_a = (12.075 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
12.075 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.500 |
| 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) |
| 2026-09-25 00:00 |
18:27:55.34 |
-19:17:07.6 |
HIP 90679 |
39.52 |
| 2026-09-25 12:00 |
18:28:01.79 |
-19:16:47.6 |
HIP 90679 |
38.54 |
| 2026-09-26 00:00 |
18:28:08.46 |
-19:16:27.5 |
HIP 90679 |
37.56 |
| 2026-09-26 12:00 |
18:28:15.35 |
-19:16:07.2 |
HIP 90679 |
36.59 |
| 2026-09-27 00:00 |
18:28:22.45 |
-19:15:46.9 |
HIP 90679 |
35.64 |
| 2026-09-27 12:00 |
18:28:29.77 |
-19:15:26.4 |
HIP 90679 |
34.71 |
| 2026-09-28 00:00 |
18:28:37.30 |
-19:15:05.9 |
HIP 90679 |
33.82 |
| 2026-09-28 12:00 |
18:28:45.04 |
-19:14:45.2 |
HIP 90679 |
32.97 |
| 2026-09-29 00:00 |
18:28:53.00 |
-19:14:24.4 |
HIP 90679 |
32.18 |
| 2026-09-29 12:00 |
18:29:01.16 |
-19:14:03.5 |
HIP 90679 |
31.47 |
| 2026-09-30 00:00 |
18:29:09.54 |
-19:13:42.4 |
HIP 90679 |
30.84 |
| 2026-09-30 12:00 |
18:29:18.13 |
-19:13:21.3 |
HIP 90801 |
30.02 |
| 2026-10-01 00:00 |
18:29:26.93 |
-19:13:00.0 |
HIP 90801 |
27.91 |
| 2026-10-01 12:00 |
18:29:35.93 |
-19:12:38.5 |
HIP 90801 |
25.76 |
| 2026-10-02 00:00 |
18:29:45.15 |
-19:12:16.9 |
HIP 90801 |
23.55 |
| 2026-10-02 12:00 |
18:29:54.57 |
-19:11:55.2 |
HIP 90801 |
21.30 |
| 2026-10-03 00:00 |
18:30:04.20 |
-19:11:33.3 |
HIP 90801 |
19.00 |
| 2026-10-03 12:00 |
18:30:14.04 |
-19:11:11.3 |
HIP 90801 |
16.65 |
| 2026-10-04 00:00 |
18:30:24.08 |
-19:10:49.1 |
HIP 90801 |
14.26 |
| 2026-10-04 12:00 |
18:30:34.32 |
-19:10:26.8 |
HIP 90801 |
11.82 |
| 2026-10-05 00:00 |
18:30:44.77 |
-19:10:04.3 |
HIP 90801 |
9.33 |
| 2026-10-05 12:00 |
18:30:55.43 |
-19:09:41.6 |
HIP 90801 |
6.80 |
| 2026-10-06 00:00 |
18:31:06.28 |
-19:09:18.8 |
HIP 90801 |
4.24 |
| 2026-10-06 12:00 |
18:31:17.34 |
-19:08:55.7 |
HIP 90801 |
1.73 |
| 2026-10-07 00:00 |
18:31:28.59 |
-19:08:32.6 |
HIP 90801 |
1.42 |
| 2026-10-07 12:00 |
18:31:40.05 |
-19:08:09.2 |
HIP 90836 |
3.20 |
| 2026-10-08 00:00 |
18:31:51.71 |
-19:07:45.6 |
HIP 90836 |
0.46 |
| 2026-10-08 12:00 |
18:32:03.56 |
-19:07:21.8 |
HIP 90870 |
2.26 |
| 2026-10-09 00:00 |
18:32:15.61 |
-19:06:57.9 |
HIP 90870 |
0.76 |
| 2026-10-09 12:00 |
18:32:27.86 |
-19:06:33.7 |
HIP 90870 |
3.59 |
| 2026-10-10 00:00 |
18:32:40.31 |
-19:06:09.4 |
HIP 90870 |
6.55 |
| 2026-10-10 12:00 |
18:32:52.94 |
-19:05:44.8 |
HIP 90900 |
9.28 |
| 2026-10-11 00:00 |
18:33:05.78 |
-19:05:20.0 |
HIP 90900 |
11.11 |
| 2026-10-11 12:00 |
18:33:18.80 |
-19:04:55.0 |
HIP 90900 |
13.44 |
| 2026-10-12 00:00 |
18:33:32.02 |
-19:04:29.8 |
HIP 90900 |
16.07 |
| 2026-10-12 12:00 |
18:33:45.42 |
-19:04:04.4 |
HIP 90900 |
18.91 |
| 2026-10-13 00:00 |
18:33:59.02 |
-19:03:38.7 |
HIP 90900 |
21.88 |
| 2026-10-13 12:00 |
18:34:12.80 |
-19:03:12.8 |
HIP 91135 |
21.13 |
| 2026-10-14 00:00 |
18:34:26.77 |
-19:02:46.7 |
HIP 91135 |
18.93 |
| 2026-10-14 12:00 |
18:34:40.93 |
-19:02:20.3 |
HIP 91135 |
17.08 |
| 2026-10-15 00:00 |
18:34:55.27 |
-19:01:53.7 |
HIP 91135 |
15.72 |
| 2026-10-15 12:00 |
18:35:09.79 |
-19:01:26.8 |
HIP 91135 |
15.03 |
| 2026-10-16 00:00 |
18:35:24.50 |
-19:00:59.7 |
HIP 91135 |
15.12 |