메타데이터
| 항목 |
값 |
| Designation |
C/2020 T5 (Lemmon) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2020-10-09T14:55:40.877760Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:34:15Z |
| Obs used |
111 |
| NEO |
- |
| M1 |
16.200 |
| K1 |
10.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2020-10-05T02:23:25.872000Z |
| Discovery magnitude (MPC) |
20.59 G |
| Discovery observatory (MPC) |
G96 · University of Arizona Mt. Lemmon Survey |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2020-10-12.0000000 |
| e |
0.99797054 |
| q (au) |
1.889011 |
| a (au) |
930.795662 |
| i (deg) |
66.603879 |
| Ω (om, deg) |
237.861698 |
| ω (w, deg) |
90.292383 |
| M (ma, deg) |
0.000083 |
밝기
산란 + 전체 선형
$$
M_a = (15.381 + 4.112\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
15.381 |
| n |
4.112 |
| gf |
1.000 |
| gb |
-0.794 |
| k |
1.000 |
| δ90 |
10.000 |
| 파라미터 |
기호 |
범위 |
설명 |
| 태양·지구거리 1 AU에서의 절대등급 |
H0 |
-5 to 20 |
혜성의 고유 밝기 |
| 광도 기울기 파라미터 |
n |
2 to 6 |
태양거리 변화에 따른 밝기 변화율 |
| 전방 산란 비대칭 계수 |
gf |
0.8 to 1 |
전방 산란의 강도 |
| 후방 산란 비대칭 계수 |
gb |
-1 to -0.5 |
후방 산란의 강도 |
| 분할 계수 |
k |
0.8 to 1 |
전·후방 산란 기여도 비율 |
| 먼지/가스 밝기 비 |
δ90 |
1 to 10 |
코마에서 먼지 산란 대비 가스 방출의 상대 기여 |
참고: EPSC-DPS2025-160
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
05:50:51.61 |
-20:05:15.0 |
HIP 27539 |
20.14 |
| 2026-07-29 12:00 |
05:50:57.80 |
-20:06:08.9 |
HIP 27539 |
20.47 |
| 2026-07-30 00:00 |
05:51:03.94 |
-20:07:03.3 |
HIP 27539 |
20.91 |
| 2026-07-30 12:00 |
05:51:10.06 |
-20:07:58.1 |
HIP 27539 |
21.47 |
| 2026-07-31 00:00 |
05:51:16.13 |
-20:08:53.4 |
HIP 27539 |
22.14 |
| 2026-07-31 12:00 |
05:51:22.17 |
-20:09:49.1 |
HIP 27539 |
22.90 |
| 2026-08-01 00:00 |
05:51:28.17 |
-20:10:45.4 |
HIP 27539 |
23.75 |
| 2026-08-01 12:00 |
05:51:34.14 |
-20:11:42.0 |
HIP 27539 |
24.67 |
| 2026-08-02 00:00 |
05:51:40.06 |
-20:12:39.2 |
HIP 27539 |
25.66 |
| 2026-08-02 12:00 |
05:51:45.95 |
-20:13:36.7 |
HIP 27539 |
26.71 |
| 2026-08-03 00:00 |
05:51:51.80 |
-20:14:34.8 |
HIP 27539 |
27.81 |
| 2026-08-03 12:00 |
05:51:57.61 |
-20:15:33.3 |
HIP 27539 |
28.95 |
| 2026-08-04 00:00 |
05:52:03.38 |
-20:16:32.2 |
HIP 27539 |
30.13 |
| 2026-08-04 12:00 |
05:52:09.11 |
-20:17:31.6 |
HIP 27539 |
31.35 |
| 2026-08-05 00:00 |
05:52:14.79 |
-20:18:31.4 |
HIP 27539 |
32.60 |
| 2026-08-05 12:00 |
05:52:20.44 |
-20:19:31.7 |
HIP 27680 |
32.34 |
| 2026-08-06 00:00 |
05:52:26.05 |
-20:20:32.4 |
HIP 27680 |
31.84 |
| 2026-08-06 12:00 |
05:52:31.62 |
-20:21:33.6 |
HIP 27680 |
31.40 |
| 2026-08-07 00:00 |
05:52:37.14 |
-20:22:35.2 |
HIP 27680 |
31.03 |
| 2026-08-07 12:00 |
05:52:42.62 |
-20:23:37.2 |
HIP 27680 |
30.74 |
| 2026-08-08 00:00 |
05:52:48.07 |
-20:24:39.6 |
HIP 27680 |
30.52 |
| 2026-08-08 12:00 |
05:52:53.46 |
-20:25:42.5 |
HIP 27680 |
30.37 |
| 2026-08-09 00:00 |
05:52:58.82 |
-20:26:45.8 |
HIP 27680 |
30.30 |
| 2026-08-09 12:00 |
05:53:04.13 |
-20:27:49.5 |
HIP 27680 |
30.31 |
| 2026-08-10 00:00 |
05:53:09.39 |
-20:28:53.7 |
HIP 27680 |
30.40 |
| 2026-08-10 12:00 |
05:53:14.61 |
-20:29:58.2 |
HIP 27680 |
30.55 |
| 2026-08-11 00:00 |
05:53:19.79 |
-20:31:03.2 |
HIP 27680 |
30.78 |
| 2026-08-11 12:00 |
05:53:24.92 |
-20:32:08.6 |
HIP 27680 |
31.09 |
| 2026-08-12 00:00 |
05:53:30.01 |
-20:33:14.4 |
HIP 27680 |
31.45 |
| 2026-08-12 12:00 |
05:53:35.05 |
-20:34:20.6 |
HIP 27680 |
31.89 |
| 2026-08-13 00:00 |
05:53:40.04 |
-20:35:27.1 |
HIP 27680 |
32.38 |
| 2026-08-13 12:00 |
05:53:44.99 |
-20:36:34.1 |
HIP 27680 |
32.94 |
| 2026-08-14 00:00 |
05:53:49.89 |
-20:37:41.5 |
HIP 27680 |
33.55 |
| 2026-08-14 12:00 |
05:53:54.74 |
-20:38:49.3 |
HIP 27680 |
34.21 |
| 2026-08-15 00:00 |
05:53:59.54 |
-20:39:57.4 |
HIP 27680 |
34.92 |
| 2026-08-15 12:00 |
05:54:04.30 |
-20:41:06.0 |
HIP 27680 |
35.67 |
| 2026-08-16 00:00 |
05:54:09.01 |
-20:42:14.9 |
HIP 27680 |
36.46 |
| 2026-08-16 12:00 |
05:54:13.66 |
-20:43:24.2 |
HIP 28081 |
36.33 |
| 2026-08-17 00:00 |
05:54:18.27 |
-20:44:33.8 |
HIP 28081 |
34.76 |
| 2026-08-17 12:00 |
05:54:22.84 |
-20:45:43.8 |
HIP 28081 |
33.19 |
| 2026-08-18 00:00 |
05:54:27.35 |
-20:46:54.2 |
HIP 28081 |
31.62 |
| 2026-08-18 12:00 |
05:54:31.81 |
-20:48:04.9 |
HIP 28081 |
30.07 |
| 2026-08-19 00:00 |
05:54:36.22 |
-20:49:16.0 |
HIP 28081 |
28.52 |