메타데이터
| 항목 |
값 |
| Designation |
C/2020 T2 (Palomar) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2021-07-11T03:28:26.996160Z |
| Orbit solution date (soln_date, UTC) |
2024-07-30T14:57:24Z |
| Obs used |
2755 |
| NEO |
- |
| M1 |
9.500 |
| K1 |
10.250 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2020-10-07T12:21:14.400000Z |
| Discovery magnitude (MPC) |
19.33 r |
| Discovery observatory (MPC) |
I41 · Palomar Mountain–ZTF |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2021-05-15.0000000 |
| e |
0.99342864 |
| q (au) |
2.054696 |
| a (au) |
312.674502 |
| i (deg) |
27.872916 |
| Ω (om, deg) |
83.048376 |
| ω (w, deg) |
150.381486 |
| M (ma, deg) |
359.989813 |
밝기
산란 + 전체 선형
$$
M_a = (7.304 + 5.380\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
7.304 |
| n |
5.380 |
| gf |
1.000 |
| gb |
-0.950 |
| k |
0.999 |
| 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
잔차 (구간 선형)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 시작일 (UTC) |
끝 (UTC) |
a |
b |
| 2019-12-11 |
2021-07-11 |
+4.3368 |
-2.066 |
| 2021-07-11 |
2022-09-21 |
+1.1155 |
-2.046 |
log10 r = log10(태양거리/AU), Δ = 지구거리(AU)
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-06-01 00:00 |
01:36:14.52 |
-17:40:15.8 |
HIP 7446 |
9.81 |
| 2026-06-01 12:00 |
01:36:20.91 |
-17:40:18.7 |
HIP 7446 |
10.72 |
| 2026-06-02 00:00 |
01:36:27.25 |
-17:40:22.2 |
HIP 7446 |
11.77 |
| 2026-06-02 12:00 |
01:36:33.56 |
-17:40:26.2 |
HIP 7446 |
12.90 |
| 2026-06-03 00:00 |
01:36:39.81 |
-17:40:30.7 |
HIP 7446 |
14.10 |
| 2026-06-03 12:00 |
01:36:46.03 |
-17:40:35.8 |
HIP 7553 |
13.94 |
| 2026-06-04 00:00 |
01:36:52.20 |
-17:40:41.5 |
HIP 7553 |
13.25 |
| 2026-06-04 12:00 |
01:36:58.32 |
-17:40:47.7 |
HIP 7553 |
12.71 |
| 2026-06-05 00:00 |
01:37:04.41 |
-17:40:54.4 |
HIP 7553 |
12.34 |
| 2026-06-05 12:00 |
01:37:10.44 |
-17:41:01.7 |
HIP 7553 |
12.13 |
| 2026-06-06 00:00 |
01:37:16.43 |
-17:41:09.5 |
HIP 7553 |
12.11 |
| 2026-06-06 12:00 |
01:37:22.38 |
-17:41:17.8 |
HIP 7553 |
12.26 |
| 2026-06-07 00:00 |
01:37:28.28 |
-17:41:26.7 |
HIP 7553 |
12.58 |
| 2026-06-07 12:00 |
01:37:34.13 |
-17:41:36.1 |
HIP 7553 |
13.06 |
| 2026-06-08 00:00 |
01:37:39.93 |
-17:41:46.1 |
HIP 7553 |
13.66 |
| 2026-06-08 12:00 |
01:37:45.69 |
-17:41:56.6 |
HIP 7553 |
14.38 |
| 2026-06-09 00:00 |
01:37:51.40 |
-17:42:07.7 |
HIP 7553 |
15.19 |
| 2026-06-09 12:00 |
01:37:57.07 |
-17:42:19.3 |
HIP 7553 |
16.08 |
| 2026-06-10 00:00 |
01:38:02.68 |
-17:42:31.4 |
HIP 7553 |
17.03 |
| 2026-06-10 12:00 |
01:38:08.25 |
-17:42:44.1 |
HIP 7718 |
18.02 |
| 2026-06-11 00:00 |
01:38:13.76 |
-17:42:57.3 |
HIP 7718 |
16.69 |
| 2026-06-11 12:00 |
01:38:19.23 |
-17:43:11.0 |
HIP 7718 |
15.38 |
| 2026-06-12 00:00 |
01:38:24.65 |
-17:43:25.3 |
HIP 7718 |
14.08 |
| 2026-06-12 12:00 |
01:38:30.02 |
-17:43:40.2 |
HIP 7718 |
12.78 |
| 2026-06-13 00:00 |
01:38:35.33 |
-17:43:55.5 |
HIP 7718 |
11.50 |
| 2026-06-13 12:00 |
01:38:40.60 |
-17:44:11.4 |
HIP 7718 |
10.23 |
| 2026-06-14 00:00 |
01:38:45.82 |
-17:44:27.9 |
HIP 7718 |
8.97 |
| 2026-06-14 12:00 |
01:38:50.98 |
-17:44:44.8 |
HIP 7718 |
7.72 |
| 2026-06-15 00:00 |
01:38:56.09 |
-17:45:02.3 |
HIP 7718 |
6.48 |
| 2026-06-15 12:00 |
01:39:01.15 |
-17:45:20.4 |
HIP 7718 |
5.26 |
| 2026-06-16 00:00 |
01:39:06.16 |
-17:45:38.9 |
HIP 7718 |
4.06 |
| 2026-06-16 12:00 |
01:39:11.11 |
-17:45:58.0 |
HIP 7718 |
2.89 |
| 2026-06-17 00:00 |
01:39:16.02 |
-17:46:17.7 |
HIP 7718 |
1.79 |
| 2026-06-17 12:00 |
01:39:20.86 |
-17:46:37.8 |
HIP 7718 |
0.98 |
| 2026-06-18 00:00 |
01:39:25.66 |
-17:46:58.5 |
HIP 7718 |
1.26 |
| 2026-06-18 12:00 |
01:39:30.40 |
-17:47:19.7 |
HIP 7718 |
2.23 |
| 2026-06-19 00:00 |
01:39:35.08 |
-17:47:41.4 |
HIP 7718 |
3.33 |
| 2026-06-19 12:00 |
01:39:39.71 |
-17:48:03.6 |
HIP 7718 |
4.45 |
| 2026-06-20 00:00 |
01:39:44.29 |
-17:48:26.4 |
HIP 7718 |
5.58 |
| 2026-06-20 12:00 |
01:39:48.81 |
-17:48:49.6 |
HIP 7718 |
6.71 |
| 2026-06-21 00:00 |
01:39:53.28 |
-17:49:13.4 |
HIP 7718 |
7.83 |
| 2026-06-21 12:00 |
01:39:57.69 |
-17:49:37.7 |
HIP 7718 |
8.94 |
| 2026-06-22 00:00 |
01:40:02.04 |
-17:50:02.5 |
HIP 7718 |
10.04 |