Asteroids with Satellites Database--Johnston's Archive

(15024) 1998 TB

compiled by Wm. Robert Johnston
last updated 23 Feb 2022

--Orbital and physical data--

(See this page for definitions of quantities; source codes in brackets, see this link for full references; *A, *D, and *E indicate assumed, derived, and estimated values, respectively.)

dynamical type, primary: main belt asteroid


orbital data, primary (osculating elements) [JPL] :
semimajor axis a: 2.435550603 AU
orbital period P: 3.801053113 yr
(= 1388.3346495 d)
eccentricity e: 0.116421868
perihelion distance q: 2.151999251 AU
aphelion distance Q: 2.7191019547 AU
inclination i: 5.95178905°
argument of perihelion ω: 354.369344°
ascending node Ω: 110.2002356°
mean anomaly M: 5.8619777°
perihelion passage TP: 2021 Dec 29.393370
Epoch: 2022 Jan 21
data arc: 1979-2022 (2358 obs.)
Earth MOID: 1.16887 AU
Jupiter Tisserand invariant TJ: 3.488


orbital data, secondary:
semimajor axis as: 9.2 km [*E]
separation/primary radius as/rp:3.7 [*E]
separation/Hill radius as/rH:0.010 [*E]
orbital period Ps: 0.7554 ± 0.0004 d [C22a]
eccentricity es: ?
normalized ang. mom. αL: ?

other data, system (combined):
absolute mag. H: 14.03 [MPC]
slope parameter G: (0.15) [*A]
effective diameter dE: 5.2 km [*E]
geometric albedo: (0.16 ) [*A]
color index U-B: ?
color index B-V: ?
taxonomic type: ?
mass m: ?
density ρ: (1.6 g/cm3) [*A]
Hill radius rH: 960 km [*E]

other data, primary:
diameter dp: 5.0 km [*E]
rotation period RPp: 2.4703 ± 0.0004 h [C22a]
amplitude in mag., rotational ΔM: 0.17 [C22a]
amplitude in mag., mutual events ΔM:0.085 ±0.035 [C22a]
pole direction Β, λ: ? , ?


other data, secondary:
diameter ds: >1.1 km [*E]
diameter ratio ds/dp: >0.22 [C22a]
component mag. difference ΔM: <3.3 [*D]
rotation period RPs: ?

-- (15024) 1998 TB --discovery and notes:

Primary discovered 1998 Oct 02 from Gekko, Japan by T. Kagawa. Alternate designation(s): 1978 NJ7, 1979 YC5, 1992 EZ, 1992 EL3. Linked to prediscovery observations from 1978 Jul.

Companion discovered 2021 Dec by M Conjat, R. Montaigut, A. Leroy using lightcurve observations from Nice Observatory, France; Observatoire de la Cote d’Azur, France; Pic du Midi Observatory, France. Announced 2022 Feb 16 [C22a].

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:


© 2022 by Wm. Robert Johnston.
Last modified 23 Feb 2022.
Return to Home. Return to Astronomy and Space. Return to Asteroids with Satellites.