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 · 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 |
-0.998 |
| 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) |
| 2026-03-26 00:00 |
05:23:55.90 |
-20:54:18.7 |
HIP 25243 |
10.68 |
| 2026-03-26 12:00 |
05:23:58.37 |
-20:53:13.1 |
HIP 25243 |
9.65 |
| 2026-03-27 00:00 |
05:24:00.91 |
-20:52:07.8 |
HIP 25243 |
8.69 |
| 2026-03-27 12:00 |
05:24:03.51 |
-20:51:02.7 |
HIP 25243 |
7.81 |
| 2026-03-28 00:00 |
05:24:06.17 |
-20:49:57.7 |
HIP 25243 |
7.05 |
| 2026-03-28 12:00 |
05:24:08.89 |
-20:48:53.0 |
HIP 25243 |
6.46 |
| 2026-03-29 00:00 |
05:24:11.67 |
-20:47:48.5 |
HIP 25243 |
6.09 |
| 2026-03-29 12:00 |
05:24:14.52 |
-20:46:44.2 |
HIP 25243 |
5.98 |
| 2026-03-30 00:00 |
05:24:17.43 |
-20:45:40.1 |
HIP 25243 |
6.14 |
| 2026-03-30 12:00 |
05:24:20.40 |
-20:44:36.2 |
HIP 25243 |
6.57 |
| 2026-03-31 00:00 |
05:24:23.43 |
-20:43:32.6 |
HIP 25243 |
7.21 |
| 2026-03-31 12:00 |
05:24:26.52 |
-20:42:29.2 |
HIP 25243 |
8.02 |
| 2026-04-01 00:00 |
05:24:29.67 |
-20:41:26.0 |
HIP 25243 |
8.95 |
| 2026-04-01 12:00 |
05:24:32.88 |
-20:40:23.1 |
HIP 25243 |
9.97 |
| 2026-04-02 00:00 |
05:24:36.14 |
-20:39:20.4 |
HIP 25243 |
11.06 |
| 2026-04-02 12:00 |
05:24:39.47 |
-20:38:18.0 |
HIP 25243 |
12.21 |
| 2026-04-03 00:00 |
05:24:42.86 |
-20:37:15.8 |
HIP 25243 |
13.39 |
| 2026-04-03 12:00 |
05:24:46.30 |
-20:36:13.9 |
HIP 25243 |
14.60 |
| 2026-04-04 00:00 |
05:24:49.81 |
-20:35:12.2 |
HIP 25243 |
15.83 |
| 2026-04-04 12:00 |
05:24:53.37 |
-20:34:10.8 |
HIP 25243 |
17.09 |
| 2026-04-05 00:00 |
05:24:56.99 |
-20:33:09.7 |
HIP 25243 |
18.36 |
| 2026-04-05 12:00 |
05:25:00.67 |
-20:32:08.8 |
HIP 25243 |
19.65 |
| 2026-04-06 00:00 |
05:25:04.40 |
-20:31:08.3 |
HIP 25243 |
20.96 |
| 2026-04-06 12:00 |
05:25:08.19 |
-20:30:08.0 |
HIP 25437 |
21.89 |
| 2026-04-07 00:00 |
05:25:12.04 |
-20:29:08.0 |
HIP 25437 |
21.78 |
| 2026-04-07 12:00 |
05:25:15.94 |
-20:28:08.2 |
HIP 25437 |
21.75 |
| 2026-04-08 00:00 |
05:25:19.90 |
-20:27:08.8 |
HIP 25437 |
21.78 |
| 2026-04-08 12:00 |
05:25:23.91 |
-20:26:09.7 |
HIP 25437 |
21.89 |
| 2026-04-09 00:00 |
05:25:27.98 |
-20:25:10.9 |
HIP 25437 |
22.07 |
| 2026-04-09 12:00 |
05:25:32.10 |
-20:24:12.3 |
HIP 25437 |
22.32 |
| 2026-04-10 00:00 |
05:25:36.28 |
-20:23:14.1 |
HIP 25437 |
22.64 |
| 2026-04-10 12:00 |
05:25:40.52 |
-20:22:16.2 |
HIP 25437 |
23.03 |
| 2026-04-11 00:00 |
05:25:44.80 |
-20:21:18.7 |
HIP 25437 |
23.48 |
| 2026-04-11 12:00 |
05:25:49.14 |
-20:20:21.4 |
HIP 25437 |
24.00 |
| 2026-04-12 00:00 |
05:25:53.54 |
-20:19:24.5 |
HIP 25437 |
24.57 |
| 2026-04-12 12:00 |
05:25:57.98 |
-20:18:27.9 |
HIP 25437 |
25.21 |
| 2026-04-13 00:00 |
05:26:02.48 |
-20:17:31.7 |
HIP 25437 |
25.89 |
| 2026-04-13 12:00 |
05:26:07.03 |
-20:16:35.7 |
HIP 25437 |
26.62 |
| 2026-04-14 00:00 |
05:26:11.64 |
-20:15:40.2 |
HIP 25437 |
27.40 |
| 2026-04-14 12:00 |
05:26:16.29 |
-20:14:44.9 |
HIP 25437 |
28.23 |
| 2026-04-15 00:00 |
05:26:21.00 |
-20:13:50.1 |
HIP 25596 |
27.59 |
| 2026-04-15 12:00 |
05:26:25.75 |
-20:12:55.6 |
HIP 25596 |
26.91 |
| 2026-04-16 00:00 |
05:26:30.56 |
-20:12:01.4 |
HIP 25596 |
26.28 |